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This is an accepted version of this page This is the latest accepted revision, reviewed on 2 February 2025. Computer program that modifies other programs to replicate itself and spread Hex dump of the Brain virus, generally regarded as the first computer virus for the IBM Personal Computer (IBM PC) and compatibles A computer virus is a type of malware that, when executed, replicates itself by ...
Fileless malware is a variant of computer related malicious software that exists exclusively as a computer memory-based artifact i.e. in RAM.It does not write any part of its activity to the computer's hard drive, thus increasing its ability to evade antivirus software that incorporate file-based whitelisting, signature detection, hardware verification, pattern-analysis, time-stamping, etc ...
If the virus is memory-resident and the day is Monday, the computer will display the string "Carfield!" every 42 seconds. [16] Mendoza (Jerusalem Mendoza): The virus does nothing if the year is 1980 or 1989, but for all other years a flag is set if the virus is memory resident and if the floppy disk motor count is 25. The flag will be set if a ...
Ada is a memory resident virus [3] that infects files. The Ada virus mainly targets .COM files, specifically COMMAND.COM and stays in the memory of the computer it infects after the program it infected executes. Infected programs have 2,600 bytes additional data inserted at the beginning of the file, [1] and the file itself contains the text ...
The first IBM PC virus in the wild was a boot sector virus dubbed (c)Brain, created in 1986 by the Farooq Alvi brothers in Pakistan. [14] Malware distributors would trick the user into booting or running from an infected device or medium. For example, a virus could make an infected computer add autorunnable code to any USB stick plugged into it.
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Instead of searching for a file to infect, Alabama searches for a file to cross-reference. The virus modifies the FAT entry so that when the user executes one file, another will appear. For instance, on a machine where Alabama is resident, executing PROGRAM1.EXE on a Friday may cause the virus to search for another program and find PROGRAM2.EXE.
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