Viruses and its History
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This presentation discusses different types of malicious code such as viruses, Trojan horses, logic bombs, and worms. It defines each type and provides examples. The presentation traces the history of computer viruses from early theoretical concepts in 1949 to modern viruses like ILOVEYOU, Koobface, and Cryptolocker. It describes how viruses attach themselves by appending to files, surrounding programs, or integrating into code. Finally, it recommends ways to prevent viruses like using antivirus software, not sharing drives without passwords, and making backups.
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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".
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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".
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A virus is a small piece of software that inserts copies of itself into other executable programs and code in order to spread. It piggybacks on real programs to execute. There are several types of viruses including boot sector viruses, which infect the boot sector and slow down or stop system operations, and macro viruses, which are associated with applications like Word and Excel and destroy data when an infected document is opened. It is important to take actions like updating anti-virus software weekly, having backups, and being cautious of unexpected email attachments to prevent virus infections.
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3) The document outlines the history of computer viruses from 1949 to 2014, describing some of the earliest viruses like Creeper and Morris Worm. It advises using up-to-date antivirus software and practicing safe browsing and downloading habits to avoid viruses.
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Computer viruses are programs that infect computers without permission. The first virus, called Creeper, was created in 1971 and spread via ARPANET. Viruses can slow computers, cause crashes, and delete files. Common ways to get viruses include opening infected email attachments, visiting malicious websites, and downloading untrusted files. Antivirus software scans for and removes viruses, but must be kept up to date to defend against new threats. Over 6,000 new viruses are created each month, so vigilance is important to avoid infection.
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Fred Cohen coined the term "computer virus" in 1983 to describe a program that can infect other programs by modifying them to include a copy of itself. In 1984, Cohen expanded the definition, noting that a virus can spread throughout a system using every user's authorizations to infect their programs, causing the infection to grow exponentially as every infected program acts as a virus.
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The document discusses various types of computer viruses and malware, how they infect systems, and methods for protection. It describes macro viruses, boot sector viruses, polymorphic viruses, file infectors, Trojan horses, worms, and famous viruses like Melissa and ILOVEYOU. Protection methods include antivirus software that uses virus definitions and behavior analysis to detect viruses, as well as firewalls that block unauthorized network traffic.
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Viruses are computer programs that replicate themselves and can damage files or systems. They spread by inserting copies of themselves into other programs or boot sectors. Common virus types include boot sector viruses, macro viruses, multipartite viruses, polymorphic viruses, and email viruses. Antivirus software works by scanning for known virus signatures or unusual activity and quarantining suspicious programs. Regularly updating antivirus software and practicing safe computing habits are recommended to prevent virus infections.
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Computer viruses, worms, and Trojan horses pose a threat to computers. Viruses spread from file to file on a computer but require file sharing to infect other computers. Worms exploit networks to spread rapidly from computer to computer. Trojan horses appear harmless but damage or steal information from infected computers. While most viruses and worms only self-replicate, some are programmed to damage systems through payloads like deleting files. Virus writers aim to evade detection through techniques like polymorphism that mutate code to avoid consistent fingerprints.
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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 provides an overview of the history, classifications, and structure of computer viruses. It discusses how viruses can replicate and spread from one computer to another by modifying other programs to include a copy of themselves. Viruses are typically 200-4000 bytes and are classified based on their structure and infection method, such as shell, add-on, and intrusive viruses. The document also outlines the key components of viruses, including search, copy, anti-detection, and payload. It describes the evolution of viruses from early generations that were simple and easy to detect to more advanced generations that are stealthy, armored, and polymorphic.
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The document discusses different types of viruses and spyware that can infect computer systems. It defines viruses, Trojan horses, worms, salami attacks, trap doors, and greedy programs. Viruses spread by attaching themselves to other programs while worms replicate over a network without needing another program. Trojan horses have hidden malicious functionality. Salami attacks involve small, unnoticeable changes that accumulate. Trap doors are secret programmer access points that can enable unauthorized access. Greedy programs excessively use system resources, denying access to others.
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This document discusses Trojan horses, including their purpose and usage. Common Trojans like Netbus and Subseven are mentioned. The document notes that Trojans do not replicate like viruses but instead facilitate unauthorized access. They can be used to hack into targeted systems and perform actions like using the machine as a botnet node or stealing data and passwords. Recent Trojans take advantage of security flaws in browsers. While antivirus software can help detect some Trojans, they remain a persistent threat, and proper computer security practices are important to prevent infection.
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1) The document discusses computer viruses, how they infect systems, and their effects. It defines a computer virus as a program designed to replicate like a biological virus and harm systems.
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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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computer viruses
Computer viruses are programs that infect computers without permission. The first virus, called Creeper, was created in 1971 and spread via ARPANET. Viruses can slow computers, cause crashes, and delete files. Common ways to get viruses include opening infected email attachments, visiting malicious websites, and downloading untrusted files. Antivirus software scans for and removes viruses, but must be kept up to date to defend against new threats. Over 6,000 new viruses are created each month, so vigilance is important to avoid infection.
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Virus
Fred Cohen coined the term "computer virus" in 1983 to describe a program that can infect other programs by modifying them to include a copy of itself. In 1984, Cohen expanded the definition, noting that a virus can spread throughout a system using every user's authorizations to infect their programs, causing the infection to grow exponentially as every infected program acts as a virus.
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The document discusses different types of computer viruses, including time bombs, logical bombs, worms, boot sector viruses, macro viruses, script viruses, and Trojan horses. It provides descriptions of each type of virus and how they infect systems and damage data. The document also lists actions people can take to prevent virus infections, such as always updating antivirus software, backing up important files, and installing security updates for operating systems and programs.
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Computer viruses are harmful programs that spread like biological viruses. The first computer virus, called BRAIN, infected boot sectors of floppy disks in 1986. Viruses spread by attaching to other files when they are exchanged or downloaded. They can slow down or crash systems by erasing files or formatting disks. Antivirus software and regular updates help prevent viruses, along with avoiding unknown file attachments or downloads.
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This document summarizes a seminar presentation on computer viruses and antiviruses. It defines different types of viruses like email viruses, worms, and Trojan horses. It also discusses what computer systems viruses can infect, like the system sector or macro files. The document outlines antivirus software functions like scanning, integrity checking, and interception. It provides guidelines for safe computing practices and approaches that antivirus software uses to detect viruses, like signatures, sandboxing, and heuristics. The conclusion emphasizes the importance of antivirus protection and dealing safely with infections.
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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.
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This document discusses computer viruses and malware. It defines different types of viruses like boot viruses, program viruses, polymorphic viruses, stealth viruses, and macro viruses. It also discusses worms, trojan horses, spam, and other types of malware. The document advocates for the potential use of "good viruses" that could help update antivirus software on networks rather than cause harm. It acknowledges the ongoing arms race between viruses and antivirus technology.
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Viruses and its History
- 1. Presentation on Viruses and malicious code Presented By: Sunil Kafle
- 2. Malicious Code Malicious code is code causing damage to a computer or system.
- 3. Types of Malicious Code Viruses. Trojan Horse. Logic Bomb. Time Bomb. Trapdoor. Worm. Rabbit.
- 4. Viruses Attach itself to program and propagates copies of itself to other programs.
- 5. Trojan Horse contain unexpected, additional functionality.
- 6. Logic Bomb triggers action when condition occur.
- 7. Time Bomb triggers action when specific time occur.
- 8. Trapdoor allows unauthorized access to functionality.
- 9. Worms propagates copies of itself through network.
- 10. Rabbit as a virus or worm replicates itself without limit to exhaust resources.
- 11. History of Computer Virus The following is a history of some of the most famous viruses and malware ever:
- 12. Self Reproducing Automata John Von Neumann came up with the theory about self- replicating programs in 1949.
- 13. Concept Fred Cohen comes up with the term “computer virus”.
- 14. Brain This is a virus also known as the “Brain boot sector”, that is compatible with IBM PC.
- 15. Core Wars It replicates itself every single time it was run in computer.
- 16. Creepers It accessed through ARPANET and copied to a remote host systems with TENEX operating system.
- 17. Animal non-malicious Trojan that is known to spread through shared tapes.
- 18. ELK Cloner These programs started to spread through files and folders that are transferred to other computers by floppy disk.
- 19. Lehigh This virus was programmed to infect command.com files from Yale University.
- 20. Cascade This virus is a self-encrypted file virus which was the outcome of IBM’s own antivirus product.
- 21. Jerusalem Virus This was developed to destroy all files in an infected computers on the thirteenth day that falls on a Friday.
- 22. Happy99 This type of worm was developed to attach itself to emails with a message Happy New Year
- 23. ILOVEYOU The is capable of deleting files in JPEGs, virus MP2, or MP3 formats.
- 24. Koobface This virus was developed and created to target Facebook and My Space.
- 25. Kenzero The is a virus that spreads online between sites through browsing history.
- 26. Cryptolocker This is trojan horse encrypts the files infected machine and demands a ransom to unlock the files.
- 27. Backoff Malware designed to compromise Point-of-Sale (POS) systems to steal credit card data.
- 28. How Viruses attach ? The virus get attached in three ways which are described as : 1. Appended Virus. 2. Virus that surrounds the program. 3. Integrated Viruses and Replacement
- 29. Appended Virus A virus attaches itself to a program. Whenever the program runs, the virus is activated.
- 30. Virus that surrounds the program This kind of virus that runs the original program but has control before and after its execution.
- 31. Integrated Viruses and Replacement A virus might replace some of its target, integrating itself into the original code of the target.
- 32. How to prevent from Virus ? Don't share Drive C: without a password and without read-only restrictions. Use Anti-Virus. Delete e-mail file attachments. Have multiple backups of important files. More secure operating systems.
- 33. Any Question ???