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.
1. What is a computer security risk?
2. Virus
3. Trojan Horse
4. Worms
5. Stand-Alone Utility Programs
6. How can a virus spread through an e-mail message?
7. How does an antivirus program inoculate a program file
?
8. What is a firewall?
.
Computer viruses are programs that can copy themselves and spread from one computer to another without permission. They can damage programs, delete files, or reformat hard disks. It is important for computer users to know about viruses in order to take steps to avoid infection, such as using antivirus software, maintaining updates, and avoiding opening email attachments from unknown senders.
Computer security risks include viruses, worms, Trojan horses, and other malware that can damage systems. Viruses are programs that can replicate and spread from one computer to another, while worms copy themselves and spread without user interaction. Trojan horses appear to have useful functions but secretly perform unwanted actions. Antivirus programs identify and remove viruses, worms, and Trojan horses, and must be frequently updated. Firewalls, passwords, backups, and avoiding opening suspicious email attachments help protect against security risks.
A computer virus is a program that can copy itself and infect a computer without permission by attaching itself to other programs. Viruses can damage data files, corrupt firmware, display unwanted messages, and cause computers to restart unexpectedly. Worms are similar but can spread autonomously between computers without needing to be part of another program. Both viruses and worms can severely slow down computer and network performance and access sensitive information. It is important to use antivirus software, avoid opening attachments from unknown senders, and not execute downloaded files before scanning them.
This document provides an overview of computer viruses including their history, types, symptoms, and prevention methods. It discusses how the first computer virus was created in 1981 and that now there are millions of viruses. There are eight main types of viruses that can damage systems like boot sector viruses or hijack browsers. Common symptoms of a virus include slow performance, freezing, and unauthorized program activity. The best prevention methods are installing antivirus software, keeping systems updated, avoiding suspicious attachments/websites, and not using pirated software.
Computer Introduction-Lecture04 for applied scince college students, Seiyun University , yemen 2023-2024 Academic year. لطلاب كلية العلوم التطبيقية بجامعة سيئون
مقدمة في علوم الحاسوب المحاضرة الرابعة
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.
1. What is a computer security risk?
2. Virus
3. Trojan Horse
4. Worms
5. Stand-Alone Utility Programs
6. How can a virus spread through an e-mail message?
7. How does an antivirus program inoculate a program file
?
8. What is a firewall?
.
Computer viruses are programs that can copy themselves and spread from one computer to another without permission. They can damage programs, delete files, or reformat hard disks. It is important for computer users to know about viruses in order to take steps to avoid infection, such as using antivirus software, maintaining updates, and avoiding opening email attachments from unknown senders.
Computer security risks include viruses, worms, Trojan horses, and other malware that can damage systems. Viruses are programs that can replicate and spread from one computer to another, while worms copy themselves and spread without user interaction. Trojan horses appear to have useful functions but secretly perform unwanted actions. Antivirus programs identify and remove viruses, worms, and Trojan horses, and must be frequently updated. Firewalls, passwords, backups, and avoiding opening suspicious email attachments help protect against security risks.
A computer virus is a program that can copy itself and infect a computer without permission by attaching itself to other programs. Viruses can damage data files, corrupt firmware, display unwanted messages, and cause computers to restart unexpectedly. Worms are similar but can spread autonomously between computers without needing to be part of another program. Both viruses and worms can severely slow down computer and network performance and access sensitive information. It is important to use antivirus software, avoid opening attachments from unknown senders, and not execute downloaded files before scanning them.
This document provides an overview of computer viruses including their history, types, symptoms, and prevention methods. It discusses how the first computer virus was created in 1981 and that now there are millions of viruses. There are eight main types of viruses that can damage systems like boot sector viruses or hijack browsers. Common symptoms of a virus include slow performance, freezing, and unauthorized program activity. The best prevention methods are installing antivirus software, keeping systems updated, avoiding suspicious attachments/websites, and not using pirated software.
Computer Introduction-Lecture04 for applied scince college students, Seiyun University , yemen 2023-2024 Academic year. لطلاب كلية العلوم التطبيقية بجامعة سيئون
مقدمة في علوم الحاسوب المحاضرة الرابعة
This document discusses computer security and cybercrime. It defines various types of cybercriminals like hackers and crackers. It also discusses different types of malware like viruses, worms, and Trojan horses. The document provides information on how to protect computers from malware through antivirus software and other security measures. It describes cybercrimes like denial of service attacks, spoofing, and information theft. The document also covers topics like encryption, digital certificates, and cyber ethics.
This document discusses viruses, antiviruses, and how to prevent virus attacks. It begins with definitions of viruses, malware, and spyware. It then covers virus languages, types of viruses like macro viruses, boot sector viruses, and worms. The document discusses symptoms of virus attacks and methods of prevention like using antivirus software and firewalls. It provides details on Windows Defender antivirus and how to enable secure logon, recognize dangerous file types, and determine when an email can be trusted. It concludes with information on removing shortcut viruses from files and drives.
Computer security threats & prevention,Its a proper introduction about computer security and threats and prevention with reference. Have info about threats and their prevention.
This document provides an overview of information security and privacy topics including computer viruses, how they work and spread, common types of viruses, virus prevention, and data security issues in the United States. It defines computer viruses, explains how they are able to replicate and attach to other programs, and notes they are created by people rather than naturally occurring. Popular virus types like file infectors, boot sector viruses, Trojan horses, and worms are described. The document also covers virus symptoms, prevention methods like antivirus software and firewalls, computer crime categories, and the 1974 Privacy Act.
This document discusses information security and privacy. It begins by defining computer viruses and how they work, reproducing and attaching to other programs. It then discusses popular types of viruses like file infectors, boot sector viruses, Trojan horses, and worms. The document outlines how viruses can damage systems and be spread, as well as common symptoms. It recommends prevention methods like antivirus software and firewalls. The document concludes by covering data security issues in the US, categories of security breaches, and the Privacy Act of 1974.
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.
This document discusses information security and privacy issues related to computer viruses. It begins by providing background on viruses and their ability to cause damage and disruption. It then defines what a computer virus is and describes how they work, infecting other programs and replicating. The document outlines various ways viruses can be acquired and categories of viruses. It also discusses the lifecycle of viruses and measures that can be taken to prevent virus infections, including using antivirus software and firewalls. The document concludes by covering data security issues, common types of security breaches, and the costs to companies from virus damage.
Viruses and malware can damage computers. Viruses spread by copying themselves, while malware is designed to access or harm devices without owner knowledge. Common malware includes adware, bugs, rootkits, Trojans, and ransomware. It is important to use updated antivirus software, strong passwords, firewalls, and be cautious of suspicious links and downloads to protect devices from viruses and malware.
Computer viruses are small programs that spread from one computer to another and interfere with operations. They are deliberately created by programmers or virus creation software. Viruses enter computers through email attachments, downloads, or infected files on removable drives. Symptoms of viruses include programs taking longer to load, changing file sizes or drive lights flashing unexpectedly. Common types are Trojan horses, worms, and boot sector viruses. Users can avoid viruses by only opening trusted email attachments, backing up files, and using updated antivirus software.
As the internet becomes more integrated into everyday lives, we must learn to defend against new online attack types. Today's hackers commonly use multi-layered attacks like a worm in a chat message linking to an infected webpage. Worms uncover vulnerabilities and report them back to hackers, who then quickly assemble malware from pre-made components to exploit the vulnerability before most can download a fix. The document provides tips to protect against emerging sophisticated, multi-faceted threats, including using strong security software, enabling automatic updates, using caution with attachments and downloads, and being aware of current threats.
Computer viruses are small programs that spread from computer to computer and interfere with operations. They are deliberately created by programmers for reasons like research, pranks, attacks, or financial gain. Viruses typically spread through email attachments, downloads, or infected files on removable drives. Symptoms of infection include slow performance, file changes or damage. People can protect computers by only opening trusted email attachments, backing up files, scanning downloads, and using antivirus software.
This document discusses computer viruses, including what they are, common types, how computers become infected, and how to protect against viruses. It defines viruses as programs that can copy themselves and infect computers without permission. The main types discussed are boot viruses, program viruses, multipartite viruses, stealth viruses, and polymorphic viruses. Computers can become infected through downloading infected software, opening email attachments, connecting infected drives, visiting malicious websites, or seeing misleading online ads. The document recommends using antivirus software such as BitDefender or Kaspersky to detect and remove viruses and protect computers.
This document discusses network and internet security and types of cyber crimes. It notes that while computers can be used for good or bad, some people use them to carry out illegal activities known as computer crimes. It then describes different types of perpetrators of cyber crimes like hackers, crackers, script kiddies, corporate spies, unethical employees, cyberextortionists, and cyberterrorists. The document also provides details on different types of computer viruses like worms, Trojan horses, macros, and boot sector viruses. It explains concepts like logic bombs, time bombs, data diddling, data stealing, and software piracy.
RRB JE Stage 2 Computer and Applications Questions Part 5CAS
Computer viruses, worms, Trojan horses, spyware, and other malware can harm computer systems in various ways. Anti-virus software, firewalls, and other security measures help protect against malware threats. Digital certificates, digital signatures, strong passwords also help secure computer systems and networks from unauthorized access.
This document discusses various computer security risks and safeguards. It describes risks like computer viruses, worms, Trojan horses, rootkits, botnets, denial of service attacks, back doors, spoofing, and different types of theft. It also discusses safeguards like antivirus software, firewalls, intrusion detection, honeypots, access controls, encryption, and policies. Computer security aims to protect systems and data from accidental or intentional harm, damage, or unauthorized access.
This document discusses network management and security. It covers common threats to computer networks like viruses, trojans, worms, logic bombs, and phishing. Viruses replicate by inserting copies of themselves into other programs. Trojans contain malicious code that causes loss of data or system harm. Worms replicate across networks to infect other computers. Logic bombs activate when specified conditions are met. Phishing attempts to steal sensitive information by masquerading as a trusted entity. The document recommends installing quality antivirus software, performing daily scans, disabling autorun features, being wary of email links and attachments, and checking website protocols to help prevent threats.
This document provides information about computer viruses, how they spread, and their types. It explains that computer viruses are malicious programs that can replicate themselves and spread from one computer to another through email attachments, downloads, or infected files. Viruses can corrupt or delete files on a computer. The document outlines different types of viruses like overwrite viruses, boot viruses, and worms. It also lists some common symptoms of an infected computer like slow performance, missing files, error messages, and printing issues. It advises the reader to avoid opening unknown email attachments, get an antivirus program, and use online virus removal tools if infected.
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.
This document discusses computer security and cybercrime. It defines various types of cybercriminals like hackers and crackers. It also discusses different types of malware like viruses, worms, and Trojan horses. The document provides information on how to protect computers from malware through antivirus software and other security measures. It describes cybercrimes like denial of service attacks, spoofing, and information theft. The document also covers topics like encryption, digital certificates, and cyber ethics.
This document discusses viruses, antiviruses, and how to prevent virus attacks. It begins with definitions of viruses, malware, and spyware. It then covers virus languages, types of viruses like macro viruses, boot sector viruses, and worms. The document discusses symptoms of virus attacks and methods of prevention like using antivirus software and firewalls. It provides details on Windows Defender antivirus and how to enable secure logon, recognize dangerous file types, and determine when an email can be trusted. It concludes with information on removing shortcut viruses from files and drives.
Computer security threats & prevention,Its a proper introduction about computer security and threats and prevention with reference. Have info about threats and their prevention.
This document provides an overview of information security and privacy topics including computer viruses, how they work and spread, common types of viruses, virus prevention, and data security issues in the United States. It defines computer viruses, explains how they are able to replicate and attach to other programs, and notes they are created by people rather than naturally occurring. Popular virus types like file infectors, boot sector viruses, Trojan horses, and worms are described. The document also covers virus symptoms, prevention methods like antivirus software and firewalls, computer crime categories, and the 1974 Privacy Act.
This document discusses information security and privacy. It begins by defining computer viruses and how they work, reproducing and attaching to other programs. It then discusses popular types of viruses like file infectors, boot sector viruses, Trojan horses, and worms. The document outlines how viruses can damage systems and be spread, as well as common symptoms. It recommends prevention methods like antivirus software and firewalls. The document concludes by covering data security issues in the US, categories of security breaches, and the Privacy Act of 1974.
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.
This document discusses information security and privacy issues related to computer viruses. It begins by providing background on viruses and their ability to cause damage and disruption. It then defines what a computer virus is and describes how they work, infecting other programs and replicating. The document outlines various ways viruses can be acquired and categories of viruses. It also discusses the lifecycle of viruses and measures that can be taken to prevent virus infections, including using antivirus software and firewalls. The document concludes by covering data security issues, common types of security breaches, and the costs to companies from virus damage.
Viruses and malware can damage computers. Viruses spread by copying themselves, while malware is designed to access or harm devices without owner knowledge. Common malware includes adware, bugs, rootkits, Trojans, and ransomware. It is important to use updated antivirus software, strong passwords, firewalls, and be cautious of suspicious links and downloads to protect devices from viruses and malware.
Computer viruses are small programs that spread from one computer to another and interfere with operations. They are deliberately created by programmers or virus creation software. Viruses enter computers through email attachments, downloads, or infected files on removable drives. Symptoms of viruses include programs taking longer to load, changing file sizes or drive lights flashing unexpectedly. Common types are Trojan horses, worms, and boot sector viruses. Users can avoid viruses by only opening trusted email attachments, backing up files, and using updated antivirus software.
As the internet becomes more integrated into everyday lives, we must learn to defend against new online attack types. Today's hackers commonly use multi-layered attacks like a worm in a chat message linking to an infected webpage. Worms uncover vulnerabilities and report them back to hackers, who then quickly assemble malware from pre-made components to exploit the vulnerability before most can download a fix. The document provides tips to protect against emerging sophisticated, multi-faceted threats, including using strong security software, enabling automatic updates, using caution with attachments and downloads, and being aware of current threats.
Computer viruses are small programs that spread from computer to computer and interfere with operations. They are deliberately created by programmers for reasons like research, pranks, attacks, or financial gain. Viruses typically spread through email attachments, downloads, or infected files on removable drives. Symptoms of infection include slow performance, file changes or damage. People can protect computers by only opening trusted email attachments, backing up files, scanning downloads, and using antivirus software.
This document discusses computer viruses, including what they are, common types, how computers become infected, and how to protect against viruses. It defines viruses as programs that can copy themselves and infect computers without permission. The main types discussed are boot viruses, program viruses, multipartite viruses, stealth viruses, and polymorphic viruses. Computers can become infected through downloading infected software, opening email attachments, connecting infected drives, visiting malicious websites, or seeing misleading online ads. The document recommends using antivirus software such as BitDefender or Kaspersky to detect and remove viruses and protect computers.
This document discusses network and internet security and types of cyber crimes. It notes that while computers can be used for good or bad, some people use them to carry out illegal activities known as computer crimes. It then describes different types of perpetrators of cyber crimes like hackers, crackers, script kiddies, corporate spies, unethical employees, cyberextortionists, and cyberterrorists. The document also provides details on different types of computer viruses like worms, Trojan horses, macros, and boot sector viruses. It explains concepts like logic bombs, time bombs, data diddling, data stealing, and software piracy.
RRB JE Stage 2 Computer and Applications Questions Part 5CAS
Computer viruses, worms, Trojan horses, spyware, and other malware can harm computer systems in various ways. Anti-virus software, firewalls, and other security measures help protect against malware threats. Digital certificates, digital signatures, strong passwords also help secure computer systems and networks from unauthorized access.
This document discusses various computer security risks and safeguards. It describes risks like computer viruses, worms, Trojan horses, rootkits, botnets, denial of service attacks, back doors, spoofing, and different types of theft. It also discusses safeguards like antivirus software, firewalls, intrusion detection, honeypots, access controls, encryption, and policies. Computer security aims to protect systems and data from accidental or intentional harm, damage, or unauthorized access.
This document discusses network management and security. It covers common threats to computer networks like viruses, trojans, worms, logic bombs, and phishing. Viruses replicate by inserting copies of themselves into other programs. Trojans contain malicious code that causes loss of data or system harm. Worms replicate across networks to infect other computers. Logic bombs activate when specified conditions are met. Phishing attempts to steal sensitive information by masquerading as a trusted entity. The document recommends installing quality antivirus software, performing daily scans, disabling autorun features, being wary of email links and attachments, and checking website protocols to help prevent threats.
This document provides information about computer viruses, how they spread, and their types. It explains that computer viruses are malicious programs that can replicate themselves and spread from one computer to another through email attachments, downloads, or infected files. Viruses can corrupt or delete files on a computer. The document outlines different types of viruses like overwrite viruses, boot viruses, and worms. It also lists some common symptoms of an infected computer like slow performance, missing files, error messages, and printing issues. It advises the reader to avoid opening unknown email attachments, get an antivirus program, and use online virus removal tools if infected.
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.
International Upcycling Research Network advisory board meeting 4Kyungeun Sung
Slides used for the International Upcycling Research Network advisory board 4 (last one). The project is based at De Montfort University in Leicester, UK, and funded by the Arts and Humanities Research Council.
Discovering the Best Indian Architects A Spotlight on Design Forum Internatio...Designforuminternational
India’s architectural landscape is a vibrant tapestry that weaves together the country's rich cultural heritage and its modern aspirations. From majestic historical structures to cutting-edge contemporary designs, the work of Indian architects is celebrated worldwide. Among the many firms shaping this dynamic field, Design Forum International stands out as a leader in innovative and sustainable architecture. This blog explores some of the best Indian architects, highlighting their contributions and showcasing the most famous architects in India.
4. 1/5/2023 4
What’s computer security?
Computer Security is the protection of computing systems and the data that they
store or access.
Computer security, also known as cyber security or IT security, is the protection
of computer systems from the theft or damage to their hardware, software or
information.
5. What’s computer viruses?
A computer virus is piece of code or a program that runs against
your wishes and is loaded onto your computer without your
knowledge.
1/5/2023 5
6. 1/5/2023 6
History of computer viruses:
The first computer virus was called “Creeper.” It was invented in 1971
written by Bob Thomas at BBN Technologies . The first known computer
virus was written in 1982 by a man named Rich Skrenta. This virus was
termed Elk Cloner, and was the first computer virus to appear outside the
computer where it was created in.
9. Time Bomb Virus: is a virus program that works in particular
date to do special activity.
Logical Bomb Virus: its destructive program that do an activity
when a certain action has occurred.
Boot Sector Virus: its infects the boot sector, the virus is loaded
in to the main memory during system boots and destroyed the
data stored in the hard.
Types of computer viruses
1/5/2023 9
10. Macros Virus: Its infects files that are created using certain
applications or programs that contain macros, like word, excel,
and power point.
• When opening the infected document the virus loaded in to
the main memory and destroyed the data stored in the
hard.
• These hide in documents that are shared via e-mail or
networks.
1/5/2023 10
Types of computer viruses
11. Script Virus: programming languages that let the user create
new features and utilities it can be written by using java script or
VBS (Visual Basic Script) programs languages.
• The main sources of web scripting viruses are the web
browsers or infected web pages.
1/5/2023 11
Types of computer viruses
12. Worm Virus: Its a kind of malicious code. It is blocking out
the system so that its operations are slowed down or
stopped.
• Its self replicating information so fast that the entire
network may collapse.
• They do not infect files or damage them.
1/5/2023 12
Types of computer viruses
13. 1/5/2023 13
Polymorphic virus
A virus that can encrypt its code in different ways so that it
appears differently in each infection. These viruses are more
difficult to detect.
Types of computer viruses
14. Trojan Horse: Its a kind of malicious code. it is usually
disguises itself as a useful program or application if executed
the computer will be damaged.
• Do not reproduce by infecting other files.
• Its not self-replicate like worms.
• Its destructive program .
1/5/2023 14
Types of computer viruses
15. 1/5/2023 15
How do computer viruses spread?
• Email and text message attachments
• Internet file downloads
• Social media links
• Mobile devices and smart phones can become infected with mobile viruses
through shady App downloads.
• As attachments of socially shareable content such as funny images, greeting
cards, or audio and video files.
• Inserting or connecting an infected disk, disc, or drive
• Visiting unknown links
16. • Computer do not boots up.
• Files/directories sometimes disappear.
• The Command CTRL+ALT+DEL No Longer Works.
• System crashes for no reason.
• Program takes longer to load.
• The program size keeps changing.
• User created files have strange names.
1/5/2023 16
How will you know you have computer viruses
17. How will you know you have computer viruses
Your computer runs unusually slow or freezes.
People are receiving emails from you which you didn’t send.
You get pop up messages and advertisements.
Slower than usual network or internet speed.
Files mysteriously appear or disappear from your computer.
Your hard drive free space keeping shrinking.
1/5/2023 17
18. Prevention from Computer Viruses
1/5/2023 18
Install the anti-virus program and keep it up to date.
Use your browser's privacy settings.
Use a pop-up blocker with your browser.
Do not open email messages from unfamiliar senders, of
email attachments that you do not recognize.
19. Prevention from Computer Viruses (Cont.)
1/5/2023 19
Do not run any download programs from the internet without
scan it.
Back Up your programs and files periodically.
Use the firewall programs.
20. 1/5/2023 20
Antivirus or Antimalware: Is a software that operates on
different OS which is used to prevent from malicious
software.
Firewall: It is a software or hardware which is used to filter
network traffic based on rules.
21. 1/5/2023 21
1. Bitdefender Antivirus Plus
2. Kaspersky Anti-Virus
3. McAfee AntiVirus Plus
4. Norton Security
5. Avast Pro Antivirus
6. AVG Anti-Virus
7. Vipre Antivirus
8. ESET Antivirus
9. Panda Antivirus
10. F-Secure Anti-Virus
Some Examples of Antiviruses