Spreading virus
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Computer viruses have become widespread due to increased internet usage. The document defines a computer virus and provides examples of different types of viruses like trojan horses, worms, and macros. It then summarizes key details about specific viruses like Back Orifice, Bubbleboy, and Melissa. The document concludes by emphasizing the importance of protection methods like antivirus software to prevent viruses from exploiting vulnerabilities in popular programs.
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Computer virus
Computer viruses have become widespread due to increased internet usage. The document defines a computer virus and discusses how they spread, examples like Melissa and Bubbleboy, and classifications such as worms, trojans, and macros. It also covers virus symptoms, prevention methods like antivirus software, and that most target Windows systems due to programming loopholes.
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This document provides an overview of computer viruses, including their definition, how they spread, common symptoms, and classifications. It discusses how viruses work, are transmitted over the internet, and examples like Melissa (a macro virus) and Bubbleboy (a worm). The document emphasizes that most viruses target Windows systems by exploiting software vulnerabilities, and stresses the importance of antivirus software, proper configurations, and limiting unnecessary programs to prevent infection.
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The document provides an overview of computer viruses including their definition, symptoms, how they work and spread, different types of viruses like worms and trojans, examples of specific viruses like Melissa and Bubbleboy, and recommendations for protection like using antivirus software and proper configurations. Computer viruses have become common with over 300 new viruses created each month that can slow down or crash systems and spread through email attachments or downloading infected files. Knowledge of how viruses infect systems can help prevent future attacks.
5 worms and other malware
Worms spread rapidly across networks by exploiting software vulnerabilities. The Morris Worm in 1988 infected 6000 computers in hours by exploiting vulnerabilities in sendmail and fingerd. Later worms like Code Red, Nimda, and Blaster also spread quickly and caused outages by attacking Microsoft software. Malware continues to be a threat and includes rootkits, botnets, spyware, and more.
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This document discusses computer viruses, including what they do, how to detect them, different types of malicious software and viruses, how viruses spread, how to remove viruses, how antivirus software works to prevent viruses, and tips to prevent malware infection. It provides an index of topics covered on slides 3 through 16, with keywords including malicious, harmful, destructive, detection, removal, antivirus, and prevention.
Viruses
The document discusses the history of computer worms and viruses. It describes how the first widely known worm, the Morris worm, was created by a graduate student in 1988 and how he was later convicted. It defines worms as software that replicates itself across a network by exploiting security vulnerabilities. The document also provides details on typical functions of computer viruses today, how viruses spread through email, and examples like the Melissa virus. It concludes with recommendations for prevention like keeping systems updated and using antivirus software.
What is a computer virus
The document discusses computer viruses, including what they are, common types, how they are created, examples of historical viruses, and methods for prevention and removal. A computer virus is a program that spreads by infecting files and copying itself. Common types include boot sector viruses, email viruses, and macro viruses. Viruses are usually deliberately created by programmers and spread in order to damage systems or distribute messages. Antivirus software works to detect and remove viruses by searching for known malicious patterns.
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This document discusses viruses and worms, including their types, lifecycles, advantages, and disadvantages. It defines viruses as code that attaches itself to other programs to damage computer systems or networks, while worms are a type of virus that can replicate itself but not attach to other programs. The document outlines different types of viruses and phases in their lifecycles. It compares viruses to worms and lists disadvantages like deleting files or causing system malfunctions. The conclusion recommends using antivirus software and Linux to protect against viruses and worms.
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Computer virus
Computer viruses have become widespread due to increased internet usage. The document defines a computer virus and discusses how they spread, examples like Melissa and Bubbleboy, and classifications such as worms, trojans, and macros. It also covers virus symptoms, prevention methods like antivirus software, and that most target Windows systems due to programming loopholes.
Senior seminar virus
This document provides an overview of computer viruses, including their definition, how they spread, common symptoms, and classifications. It discusses how viruses work, are transmitted over the internet, and examples like Melissa (a macro virus) and Bubbleboy (a worm). The document emphasizes that most viruses target Windows systems by exploiting software vulnerabilities, and stresses the importance of antivirus software, proper configurations, and limiting unnecessary programs to prevent infection.
Virus
The document provides an overview of computer viruses including their definition, symptoms, how they work and spread, different types of viruses like worms and trojans, examples of specific viruses like Melissa and Bubbleboy, and recommendations for protection like using antivirus software and proper configurations. Computer viruses have become common with over 300 new viruses created each month that can slow down or crash systems and spread through email attachments or downloading infected files. Knowledge of how viruses infect systems can help prevent future attacks.
5 worms and other malware
Worms spread rapidly across networks by exploiting software vulnerabilities. The Morris Worm in 1988 infected 6000 computers in hours by exploiting vulnerabilities in sendmail and fingerd. Later worms like Code Red, Nimda, and Blaster also spread quickly and caused outages by attacking Microsoft software. Malware continues to be a threat and includes rootkits, botnets, spyware, and more.
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This document discusses computer viruses, including what they do, how to detect them, different types of malicious software and viruses, how viruses spread, how to remove viruses, how antivirus software works to prevent viruses, and tips to prevent malware infection. It provides an index of topics covered on slides 3 through 16, with keywords including malicious, harmful, destructive, detection, removal, antivirus, and prevention.
Viruses
The document discusses the history of computer worms and viruses. It describes how the first widely known worm, the Morris worm, was created by a graduate student in 1988 and how he was later convicted. It defines worms as software that replicates itself across a network by exploiting security vulnerabilities. The document also provides details on typical functions of computer viruses today, how viruses spread through email, and examples like the Melissa virus. It concludes with recommendations for prevention like keeping systems updated and using antivirus software.
What is a computer virus
The document discusses computer viruses, including what they are, common types, how they are created, examples of historical viruses, and methods for prevention and removal. A computer virus is a program that spreads by infecting files and copying itself. Common types include boot sector viruses, email viruses, and macro viruses. Viruses are usually deliberately created by programmers and spread in order to damage systems or distribute messages. Antivirus software works to detect and remove viruses by searching for known malicious patterns.
Viruses ppt
This document discusses viruses and worms, including their types, lifecycles, advantages, and disadvantages. It defines viruses as code that attaches itself to other programs to damage computer systems or networks, while worms are a type of virus that can replicate itself but not attach to other programs. The document outlines different types of viruses and phases in their lifecycles. It compares viruses to worms and lists disadvantages like deleting files or causing system malfunctions. The conclusion recommends using antivirus software and Linux to protect against viruses and worms.
1311782 634629102605888750
A computer virus is a program that spreads from one computer to another and interferes with computer operation. Viruses can corrupt or delete data. They replicate by attaching themselves to other programs or files. Common types include macro, polymorphic, and metamorphic viruses. Symptoms of a virus include slow performance, random restarts, and loss of disk space. Viruses are typically spread through email attachments, networks, removable media, and pirated software. People create viruses for fun, profit, or revenge, while info attackers aim to disrupt networks. To protect against viruses, users should install and regularly update antivirus software, avoid unknown emails/files, and use security measures like firewalls.
Virus and worms analysis
This document discusses viruses and worms, describing that viruses inject code into files while worms copy themselves over a network. It then lists common infection methods like email attachments and browser exploits. The document outlines virus characteristics like remaining hidden, carrying other viruses, and persisting after formatting. It describes the infection process and payload delivery. Finally, it lists different virus types and techniques used to avoid detection like maintaining file modification dates and encrypting code.
Network virus detection & prevention
This document discusses network viruses and strategies for virus detection and prevention. It defines viruses, worms, and Trojan horses and explains how they differ. It then covers various virus spreading strategies and types, including binary, script, macro, boot sector, and worm viruses. The document also discusses detection methods like signature-based and heuristic detection. For prevention, it recommends keeping antivirus software and signatures updated to identify new viruses. Memory demands of antivirus software are also discussed.
Viruses, Worms And Trojan Horses
Viruses, worms, and Trojan horses are malicious software programs that can infect computers. Viruses typically infect computers through opening infected email attachments and then replicate quickly, spreading from one computer to another worldwide. Some viruses just overwhelm email servers with messages, while others may lie dormant for a period of time before deleting files or entire hard drives. In 1988, a virus accidentally sent by a student infected over 6,000 computers in minutes, nearly crashing the internet. To protect against these digital threats, users should run regular antivirus software to scan incoming emails and files for infections.
Virus and worms
Viruses and worms are malicious programs that can damage computers. Viruses attach themselves to files and spread when those files are opened, while worms can spread automatically from one computer to another without human action. Basic virus structure involves looking for infectable objects, infecting them, and then returning control to the infected program. Worms differ in that they replicate and spread automatically between systems rather than needing a host program. Protecting against viruses and worms involves keeping systems updated, using antivirus software, conducting regular scans, and employing a firewall.
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This document defines and describes different types of computer viruses. It begins by defining a computer virus as a program that installs itself on a computer without permission and runs against the user's wishes. It then lists and describes 7 main types of viruses:
1) File infector viruses infect files with .exe or .com extensions and overwrite the infected file.
2) Boot sector viruses infect storage devices like floppy disks and are able to infect when used to boot a computer.
3) Master boot record viruses replace the master boot record with their own code and run when a computer boots up.
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This document defines and describes different types of computer viruses. It explains that a computer virus is a program that damages computer systems and destroys or erases data files. It then lists and provides details on various types of viruses, including time bombs, logical bombs, worms, boot sector viruses, macro viruses, script viruses, and Trojan horses. The document concludes by offering actions people can take to prevent virus infections, such as updating anti-virus software weekly, backing up important files, and being cautious of unexpected email attachments.
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The document discusses network virus detection and prevention, describing different types of viruses like worms, Trojans, and viruses, how they spread and infect systems through various techniques like overwriting files or boot sectors. It also covers methods of identifying viruses through signature-based detection or heuristics, as well as prevention techniques like generations of antivirus software and case studies of worms like Slammer and Blaster.
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The document introduces computer viruses, describing them as software programs that can copy themselves and attach to other files or applications. It outlines three main types of viruses: boot viruses, program viruses, and macro viruses. The document also explains what computer viruses do once installed, such as taking control of systems and replicating themselves to perform harmful tasks. Additionally, it lists the top five sources of virus attacks as downloadable programs, cracked software, email attachments, the internet, and booting from CDs. Finally, some of the best antivirus software options are mentioned.
Computer viruses
This document defines and discusses various types of malware such as computer viruses, worms, and zombies. It provides a timeline of notable computer viruses from 1981-1988 and describes how viruses spread by inserting copies of themselves into other executable files. Worms are defined as self-replicating programs that do not require being part of another program. The Morris worm of 1988 was one of the first major worms. Zombies have been used to send a majority of spam emails. Denial of service attacks aim to deny service to legitimate users by overloading the target system. Notable viruses discussed include Melissa, ILOVEYOU, and MyDoom.
Virus soran university
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Computer virus 1
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This document discusses different types of malware such as viruses, worms, Trojans, and blended threats. It describes how viruses spread by infecting files and requiring user interaction, while worms can spread automatically from computer to computer by exploiting vulnerabilities. Trojans appear useful but have hidden malicious functions. Blended threats combine characteristics of different malware types. The document also outlines how malware infects systems, hides, and can be detected through techniques like signatures and behavior analysis.
Ids 007 trojan horse
Trojans are malware that disguise themselves to gain access to a user's computer without their awareness. They spread by tricking users into downloading email attachments or clicking on fake advertisements. Once installed, they can allow hackers to access personal information, delete files, or use the computer as an anonymizing proxy for illegal activities. Examples include Zeus, which steals banking credentials, and CryptoLocker ransomware, which encrypts files until a ransom is paid. Trojans demonstrate that no system is immune, as shown by the Mac Flashback Trojan.
Computer virus
A computer virus is a program that installs itself and runs without permission on an infected computer. There are different types of viruses like email viruses, trojan horses, and worms. Viruses can spread through email attachments, websites, networks, software, and removable drives. Symptoms of a virus include slow performance, unexpected program/file changes, browser issues, and unauthorized emails sent from the infected device. People are advised to use antivirus software, practice safe browsing/email habits, keep systems updated, and use firewalls to protect against viruses. Popular antivirus programs are listed that can help keep computers secure.
Viruses And Hacking
A computer virus is a program that can copy itself without permission and infect other computers. It spreads by attaching itself to other programs and files that are transferred between computers. Viruses replicate by piggybacking on real programs and files and automatically spreading to other computers through email attachments or by exploiting security vulnerabilities over networks. The first computer virus was created in 1986 and was named "Brain".
Computer viruses
A computer virus is a program that can copy itself without permission and infect other computers. It spreads by attaching itself to other programs and files that are transferred between computers. Viruses replicate by piggybacking on real programs and files and then reproducing themselves when those programs are run or files opened. The first computer virus was created in 1986 and was named "Brain".
Sanmi's first pp
This document summarizes computer viruses, including their origin, symptoms, types, and prevention. It discusses how viruses are programs that can damage computers by spreading and destroying files. Common virus types are boot sector, macro, multipartite, polymorphic, email worms, and Trojan horses. Symptoms of infection include slow performance, crashing, and file/directory loss. The best prevention is installing antivirus software, practicing safe computing habits, and avoiding unknown programs and email attachments. Antivirus software works by scanning for known virus signatures or flagging unusual activity.
Computer virus
A computer virus is a type of malicious software or malware that can replicate itself and spread by inserting copies of its code into other computer programs or files. When executed, the virus code can damage programs, delete files, or disrupt the operation of the computer. Viruses spread similar to biological viruses by making copies of themselves that get transferred to other computers or storage devices. Common symptoms of a virus infection include programs running slowly, unexpected computer behavior, and files being deleted or corrupted.
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1311782 634629102605888750
A computer virus is a program that spreads from one computer to another and interferes with computer operation. Viruses can corrupt or delete data. They replicate by attaching themselves to other programs or files. Common types include macro, polymorphic, and metamorphic viruses. Symptoms of a virus include slow performance, random restarts, and loss of disk space. Viruses are typically spread through email attachments, networks, removable media, and pirated software. People create viruses for fun, profit, or revenge, while info attackers aim to disrupt networks. To protect against viruses, users should install and regularly update antivirus software, avoid unknown emails/files, and use security measures like firewalls.
Virus and worms analysis
This document discusses viruses and worms, describing that viruses inject code into files while worms copy themselves over a network. It then lists common infection methods like email attachments and browser exploits. The document outlines virus characteristics like remaining hidden, carrying other viruses, and persisting after formatting. It describes the infection process and payload delivery. Finally, it lists different virus types and techniques used to avoid detection like maintaining file modification dates and encrypting code.
Network virus detection & prevention
This document discusses network viruses and strategies for virus detection and prevention. It defines viruses, worms, and Trojan horses and explains how they differ. It then covers various virus spreading strategies and types, including binary, script, macro, boot sector, and worm viruses. The document also discusses detection methods like signature-based and heuristic detection. For prevention, it recommends keeping antivirus software and signatures updated to identify new viruses. Memory demands of antivirus software are also discussed.
Viruses, Worms And Trojan Horses
Viruses, worms, and Trojan horses are malicious software programs that can infect computers. Viruses typically infect computers through opening infected email attachments and then replicate quickly, spreading from one computer to another worldwide. Some viruses just overwhelm email servers with messages, while others may lie dormant for a period of time before deleting files or entire hard drives. In 1988, a virus accidentally sent by a student infected over 6,000 computers in minutes, nearly crashing the internet. To protect against these digital threats, users should run regular antivirus software to scan incoming emails and files for infections.
Virus and worms
Viruses and worms are malicious programs that can damage computers. Viruses attach themselves to files and spread when those files are opened, while worms can spread automatically from one computer to another without human action. Basic virus structure involves looking for infectable objects, infecting them, and then returning control to the infected program. Worms differ in that they replicate and spread automatically between systems rather than needing a host program. Protecting against viruses and worms involves keeping systems updated, using antivirus software, conducting regular scans, and employing a firewall.
Virus slides
This document defines and describes different types of computer viruses. It begins by defining a computer virus as a program that installs itself on a computer without permission and runs against the user's wishes. It then lists and describes 7 main types of viruses:
1) File infector viruses infect files with .exe or .com extensions and overwrite the infected file.
2) Boot sector viruses infect storage devices like floppy disks and are able to infect when used to boot a computer.
3) Master boot record viruses replace the master boot record with their own code and run when a computer boots up.
As computer virus
This document defines and describes different types of computer viruses. It explains that a computer virus is a program that damages computer systems and destroys or erases data files. It then lists and provides details on various types of viruses, including time bombs, logical bombs, worms, boot sector viruses, macro viruses, script viruses, and Trojan horses. The document concludes by offering actions people can take to prevent virus infections, such as updating anti-virus software weekly, backing up important files, and being cautious of unexpected email attachments.
Network virus detection & prevention
The document discusses network virus detection and prevention, describing different types of viruses like worms, Trojans, and viruses, how they spread and infect systems through various techniques like overwriting files or boot sectors. It also covers methods of identifying viruses through signature-based detection or heuristics, as well as prevention techniques like generations of antivirus software and case studies of worms like Slammer and Blaster.
Virus
The document introduces computer viruses, describing them as software programs that can copy themselves and attach to other files or applications. It outlines three main types of viruses: boot viruses, program viruses, and macro viruses. The document also explains what computer viruses do once installed, such as taking control of systems and replicating themselves to perform harmful tasks. Additionally, it lists the top five sources of virus attacks as downloadable programs, cracked software, email attachments, the internet, and booting from CDs. Finally, some of the best antivirus software options are mentioned.
Computer viruses
This document defines and discusses various types of malware such as computer viruses, worms, and zombies. It provides a timeline of notable computer viruses from 1981-1988 and describes how viruses spread by inserting copies of themselves into other executable files. Worms are defined as self-replicating programs that do not require being part of another program. The Morris worm of 1988 was one of the first major worms. Zombies have been used to send a majority of spam emails. Denial of service attacks aim to deny service to legitimate users by overloading the target system. Notable viruses discussed include Melissa, ILOVEYOU, and MyDoom.
Virus soran university
that my presentation about virus and types of virus at soran university school of engineering enjoy :)
Computer virus 1
a powerpoint silde to show simple idea what is computer virus.very basic suitable for class 6 students
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A brief presentation over computer viruses, which is presently ignored by most computer users.
Made by Utkarsh Srivastava for college 'routine task' purpose!
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This document discusses different types of malware such as viruses, worms, Trojans, and blended threats. It describes how viruses spread by infecting files and requiring user interaction, while worms can spread automatically from computer to computer by exploiting vulnerabilities. Trojans appear useful but have hidden malicious functions. Blended threats combine characteristics of different malware types. The document also outlines how malware infects systems, hides, and can be detected through techniques like signatures and behavior analysis.
Ids 007 trojan horse
Trojans are malware that disguise themselves to gain access to a user's computer without their awareness. They spread by tricking users into downloading email attachments or clicking on fake advertisements. Once installed, they can allow hackers to access personal information, delete files, or use the computer as an anonymizing proxy for illegal activities. Examples include Zeus, which steals banking credentials, and CryptoLocker ransomware, which encrypts files until a ransom is paid. Trojans demonstrate that no system is immune, as shown by the Mac Flashback Trojan.
Computer virus
A computer virus is a program that installs itself and runs without permission on an infected computer. There are different types of viruses like email viruses, trojan horses, and worms. Viruses can spread through email attachments, websites, networks, software, and removable drives. Symptoms of a virus include slow performance, unexpected program/file changes, browser issues, and unauthorized emails sent from the infected device. People are advised to use antivirus software, practice safe browsing/email habits, keep systems updated, and use firewalls to protect against viruses. Popular antivirus programs are listed that can help keep computers secure.
Viruses And Hacking
A computer virus is a program that can copy itself without permission and infect other computers. It spreads by attaching itself to other programs and files that are transferred between computers. Viruses replicate by piggybacking on real programs and files and automatically spreading to other computers through email attachments or by exploiting security vulnerabilities over networks. The first computer virus was created in 1986 and was named "Brain".
Computer viruses
A computer virus is a program that can copy itself without permission and infect other computers. It spreads by attaching itself to other programs and files that are transferred between computers. Viruses replicate by piggybacking on real programs and files and then reproducing themselves when those programs are run or files opened. The first computer virus was created in 1986 and was named "Brain".
Sanmi's first pp
This document summarizes computer viruses, including their origin, symptoms, types, and prevention. It discusses how viruses are programs that can damage computers by spreading and destroying files. Common virus types are boot sector, macro, multipartite, polymorphic, email worms, and Trojan horses. Symptoms of infection include slow performance, crashing, and file/directory loss. The best prevention is installing antivirus software, practicing safe computing habits, and avoiding unknown programs and email attachments. Antivirus software works by scanning for known virus signatures or flagging unusual activity.
Computer virus
A computer virus is a type of malicious software or malware that can replicate itself and spread by inserting copies of its code into other computer programs or files. When executed, the virus code can damage programs, delete files, or disrupt the operation of the computer. Viruses spread similar to biological viruses by making copies of themselves that get transferred to other computers or storage devices. Common symptoms of a virus infection include programs running slowly, unexpected computer behavior, and files being deleted or corrupted.
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Hello Everyone ! Hope everybody doing good in their work and with their busy life.
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Board structure and firm performance of hotel and travel sector companies in ...
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The top sources of virus attacks are highlighted below: Downloadable Programs Cracked Software Email Attachments Internet Booting From CD. 10. Best antivirus software. Norton antivirus. MacAfee virus scan Kaspersky antivirus. 11. Norton antivirus Norton antivirus is a product of Symantec corporation.The top sources of virus attacks are highlighted below: Downloadable Programs Cracked Software Email Attachments Internet Booting From CD. 10. Best antivirus software. Norton antivirus. MacAfee virus scan Kaspersky antivirus. 11. Norton antivirus Norton antivirus is a product of Symantec corporation.
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This document defines viruses and worms, and outlines their history. It discusses how viruses spread by inserting copies of themselves into other programs, while worms are self-contained programs that spread across networks. The Morris worm of 1988 was one of the first major worms. Later, viruses spread via email with examples like Melissa and ILOVEYOU. MyDoom in 2004 was a major virus that caused widespread internet disruption through distributed denial of service attacks. Prevention methods against viruses and worms include software updates, antivirus programs, and more secure operating systems.
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Computer viruses have become widespread due to increased internet usage. A virus is a malicious computer program that can spread itself to other files and computers without permission. While some viruses only cause minor issues, others can severely damage systems by deleting files or rendering computers unusable. Viruses are typically spread by opening infected files from the internet or removable media. It is important to use antivirus software, avoid untrusted sources, and not open potentially risky file types in order to prevent virus infections.
VIRUSES AND ANTI-VIRUSES
Computer viruses and worms can infect systems in different ways. Viruses copy themselves without permission onto an infected computer, while worms replicate by moving from computer to computer across a network. Examples of major viruses and worms include Melissa, I Love You, Code Red, and Bubbleboy. It is important to regularly update antivirus software, backup important files, avoid unexpected email attachments, and be trained on computer security best practices to help prevent and address infections.
Data loss causes and its threats
There are several causes of data loss, including viruses, human error, sabotage/hacking, and natural disasters. Viruses can be categorized based on their spread and impact as low, medium, or high threat. Computer hoaxes spread false warnings about new viruses in order to trick users. File viruses can infect executable files across various operating systems. Macro viruses target files created in office productivity software. Trojans are programs that allow remote access to infected systems. Worms are self-replicating viruses that can spread rapidly by exploiting email systems. Human error is a major cause of data loss, with users accidentally deleting or formatting data. Sabotage can be carried out by disgruntled employees or hackers. Natural
Computer virus
The document discusses computer viruses including what they are, why they are created, a brief history of viruses, types of viruses, and ways to prevent virus infections. It defines a computer virus as a program designed to harm infected computers. It then covers different types like macro, memory resident, overwrite, and direct action viruses. The document also discusses virus symptoms, notable viruses from the past, and recommends only downloading files from trusted sites and using antivirus software to prevent virus infections.
Digital Immunity -The Myths and Reality
This document summarizes information about malware threats, including viruses, worms, Trojan horses, joke programs, hoaxes, and logic bombs. It discusses the types and examples of different malware, how they spread, their potential impacts, and an incident management model for preparation, detection, containment, eradication, recovery, and reporting of malware incidents. The summary concludes by stating that malware will continue to evolve and there is no single solution, requiring ongoing mitigation and management efforts.
COMPUTER VIRUSES AND WORMS.pdf
Computer viruses and worms are malicious software programs that spread from computer to computer and interfere with operations. Viruses spread through email attachments and downloads, while worms replicate by exploiting security vulnerabilities to copy themselves to other systems on a network. Common types are executable viruses, boot sector viruses, and macro viruses like the damaging Melissa virus of 1999. Prevention methods include installing antivirus software, keeping systems updated, and using firewalls. Trojan viruses differ in that they do not self-replicate but perform unauthorized actions like deleting or blocking access to data when activated. The first major computer worm was the Morris worm of 1988, which disrupted many systems and led to the conviction of its creator.
Computer Virus
Computer viruses are malicious programs that can damage systems and erase data. There are different types like viruses, worms, and Trojan horses. Viruses piggyback on other programs to replicate, worms use networks to spread, while Trojans masquerade as useful programs but have hidden harms. Signs of infection include slow performance, crashes, and missing files. Regular antivirus updates, secure practices like avoiding untrusted sources can help prevent damage from viruses.
Introduction to Computer Virus
This document discusses computer viruses, including what they are, how they spread, how to identify them, and how to prevent them. A computer virus is a type of malicious software that can replicate itself and spread from one computer to another. Viruses often perform harmful actions like deleting files or stealing data. They typically spread through email attachments, downloads, or removable drives. Signs of a virus include computers running slowly, applications not opening, and antivirus software disappearing. The document recommends installing antivirus software and avoiding suspicious websites or email attachments to prevent viruses. It also lists some well-known antivirus programs.
computer virus Report
This document provides an introduction and overview of computer viruses. It defines computer viruses and explains how they work, discussing how viruses actively infect systems and spread. It categorizes common types of computer viruses such as macro viruses, memory resident viruses, overwrite viruses, and more. Specific virus names are listed as examples for each category. The document also discusses how to protect systems from computer viruses and describes some problems caused by viruses.
New Wordpad Document
This document outlines the history of computer viruses from their theoretical conception in 1949 through major viruses in the early 2000s. Some key events include the first viruses found "in the wild" in 1981, Fred Cohen formally defining the term "computer virus" in 1983, the first file and macro viruses in the late 1980s, the rise of antivirus software in the early 1990s as viruses proliferated, and some of the most widespread and damaging viruses of the late 1990s and early 2000s like Melissa, ILOVEYOU, CodeRed, and MyDoom. The document traces how viruses evolved from early isolated incidents to become a major threat as connectivity and software increased.
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Spreading virus
- 2. Introduction Computer virus have become today’s headline news With the increasing use of the Internet, it has become easier for virus to spread Virus show us loopholes in software Most virus are targeted at the MS Windows OS
- 3. Definition Virus : A true virus is capable of self replication on a machine. It may spread between files or disks, but the defining character is that it can recreate itself on it’s own with out traveling to a new host
- 5. Background There are estimated 30,000 computer viruses in existence Over 300 new ones are created each month First virus was created to show loopholes in software
- 6. Virus Languages ANSI COBOL C/C++ Pascal VBA Unix Shell Scripts JavaScript Basically any language that works on the system that is the target
- 7. Symptoms of Virus Attack Computer runs slower then usual Computer no longer boots up Screen sometimes flicker PC speaker beeps periodically System crashes for no reason Files/directories sometimes disappear Denial of Service (DoS)
- 8. Virus through the Internet Today almost 87% of all viruses are spread through the internet (source: ZDNet) Transmission time to a new host is relatively low, on the order of hours to days “Latent virus”
- 9. Classifying Virus - General Virus Information Discovery Date: Origin: Length: Type: SubType: Risk Assessment: Category:
- 10. Classifying Virus - Categories Stealth Polymorphic Companion Armored
- 11. Classifying Virus - Types Trojan Horse Worm Macro
- 12. Trojan Horse Covert Leaks information Usually does not reproduce
- 13. Trojan Horse Back Orifice Discovery Date: 10/15/1998 Origin: Pro-hacker Website Length: 124,928 Type: Trojan SubType: Remote Access Risk Assessment: Low Category: Stealth
- 14. Trojan Horse About Back Orifice requires Windows to work distributed by “Cult of the Dead Cow” similar to PC Anywhere, Carbon Copy software allows remote access and control of other computers install a reference in the registry once infected, runs in the background by default uses UDP port 54320 TCP port 54321 In Australia 72% of 92 ISP surveyed were infected with Back Orifice
- 15. Trojan Horse Features of Back Orifice pings and query servers reboot or lock up the system list cached and screen saver password display system information logs keystrokes edit registry server control receive and send files display a message box
- 16. Worms Spread over network connection Worms replicate First worm released on the Internet was called Morris worm, it was released on Nov 2, 1988.
- 17. Worms Bubbleboy Discovery Date: 11/8/1999 Origin: Argentina (?) Length: 4992 Type: Worm/Macro SubType: VbScript Risk Assessment: Low Category: Stealth/Companion
- 18. Worms Bubbleboy requires WSL (windows scripting language), Outlook or Outlook Express, and IE5 Does not work in Windows NT Effects Spanish and English version of Windows 2 variants have been identified Is a “latent virus” on a Unix or Linux system May cause DoS
- 19. Worms How Bubbleboy works Bubbleboy is embedded within an email message of HTML format. a VbScript while the user views a HTML page a file named “Update.hta” is placed in the start up directory upon reboot Bubbleboy executes
- 20. Worms How Bubbleboy works changes the registered owner/organization HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurren tVersionRegisteredOwner = “Bubble Boy” HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurren tVersionRegisteredOrganization = “Vandalay Industry” using the Outlook MAPI address book it sends itself to each entry marks itself in the registry HKEY_LOCAL_MACHINESoftwareOutlook.bubbleboy = “OUTLOOK.Bubbleboy1.0 by Zulu”
- 21. Macro Specific to certain applications Comprise a high percentage of the viruses Usually made in WordBasic and Visual Basic for Applications (VBA) Microsoft shipped “Concept”, the first macro virus, on a CD ROM called "Windows 95 Software Compatibility Test" in 1995
- 22. Macro Melissa Discovery Date: 3/26/1999 Origin: Newsgroup Posting Length: varies depending on variant Type: Macro/Worm Subtype: Macro Risk Assessment: High Category: Companion
- 23. Macro Melissa requires WSL, Outlook or Outlook Express Word 97 SR1 or Office 2000 105 lines of code (original variant) received either as an infected template or email attachment lowers computer defenses to future macro virus attacks may cause DoS infects template files with it’s own macro code 80% of of the 150 Fortune 1000 companies were affected
- 24. Macro How Melissa works the virus is activated through a MS word document document displays reference to pornographic websites while macro runs 1st lowers the macro protection security setting for future attacks checks to see is it has run in current session before HKEY_LOCAL_MACHINESoftwareMicrosoftOfficeMelissa = “by Kwyjibo” propagates itself using the Outlook MAPI address book (emails sent to the first 50 addresses)
- 25. Macro How Melissa works infects the Normal.dot template file with it’s own code Lastly if the minutes of the hour match up to the date the macro inserts a quote by Bart Simpson into the current document “Twenty two points, plus triple word score, plus fifty points for using all my letters. Game’s over. I’m outta here.”
- 26. Protection/Prevention Knowledge Proper configurations Run only necessary programs Anti-virus software
- 27. Case study
- 28. Conclusion More about virus and how: viruses work through your system to make a better virus Have seen how viruses show us a loophole in popular software Most viruses show that they can cause great damage due to loopholes in programming