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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 ...
This method of infection is very similar to that which is utilised by the OneHalf computer virus. Contrary to the usual method of infecting executables (which is to append virus body to the executable and to change the entry point), it inserts several fragments ("patches") of its code in random places inside the file. These fragments transfer ...
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 ...
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 ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 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 ...
ABC, discovered in October 1992, is a memory-resident, file-infecting computer virus which infects EXE files and may alter both COM and EXE files. ABC activates on the 13th day of every month. Upon infection, ABC becomes memory-resident at the top of system memory but below the 640K DOS boundary and hooks interrupts 16 and 1C.
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.
Natas (Satan spelled backwards) is a computer virus written by James Gentile, a then-18-year-old hacker from San Diego, California who went by the alias of "Little Loc" and later "Priest". The virus was made for a Mexican politician who wanted to win the Mexican elections by affecting all the Mexican Federal Electoral Institute (IFE) computers ...