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A computer virus [1] is a type of malware that, when executed, replicates itself by modifying other computer programs and inserting its own code into those programs. [2] [3] If this replication succeeds, the affected areas are then said to be "infected" with a computer virus, a metaphor derived from biological viruses.
March 26: The Melissa worm was released, targeting Microsoft Word and Outlook -based systems, and creating considerable network traffic. June 6: The ExploreZip worm, which destroys Microsoft Office documents, was first detected. September: the CTX virus is isolated.
Leap - Mac OS X Trojan horse. Shamoon a wiper virus with stolen digital certificates destroyed over 35,000 computers owned by Saudi Aramco. Storm Worm - A Windows trojan horse that forms the Storm botnet. Stuxnet First destructive ICS -targeting Trojan which destroyed part of Iran 's nuclear program.
Logic bomb. A logic bomb is a piece of code intentionally inserted into a software system that will set off a malicious function when specified conditions are met. For example, a programmer may hide a piece of code that starts deleting files (such as a salary database trigger ), should they ever be terminated from the company.
Computer viruses generally require a host program. [11] The virus writes its own code into the host program. When the program runs, the written virus program is executed first, causing infection and damage. A worm does not need a host program, as it is an independent program or code chunk.
CIH (computer virus) CIH, also known as Chernobyl or Spacefiller, is a Microsoft Windows 9x computer virus that first emerged in 1998. Its payload is highly destructive to vulnerable systems, overwriting critical information on infected system drives and, in some cases, destroying the system BIOS. The virus was created by Chen Ing-hau ...
Dismissing it would reboot the computer and then display the message again. Klez: October 2001 Koobface: December 2008 Targeted MySpace and Facebook users with a heading of "Happy Holidays". Leap-A: Oompa-Loompa Trojan worm February 14, 2006 Most known for being the first virus targeting Mac computers. Morris: November 2, 1988 Robert Tappan Morris
Melissa (computer virus) The Melissa virus is a mass-mailing macro virus released on or around March 26, 1999. It targets Microsoft Word and Outlook -based systems and created considerable network traffic. The virus infects computers via email; the email is titled "Important Message From," followed by the current username.