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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 640 K DOS boundary and hooks interrupts 16 and 1C.
Due to a bug in the virus, only the first EXE file in any directory is infected. Abraxas-infected files will become 1,171 bytes in length and contain Abraxas' viral code. The file's date and time in the DOS disk directory listing will be set to the system date and time when infection occurred. The following text strings can be found within the ...
EXE file, Ontario.1024 goes memory resident and infects files of these types upon being opened. COMMAND.COM is infected using a special routine. Infected files will increase in size by 1,024 bytes. However, when Ontario.1024 is in memory, no increase in file size will be observed due to the virus' stealthing.
File virus 1987-10 Seattle: Virus coders created many variants of the virus, making Jerusalem one of the largest families of viruses ever created. It even includes many sub-variants and a few sub-sub-variants. WannaCry: WannaCrypt, WannaCryptor Windows Ransomware Cryptoworm 2017 World North Korea: WDEF WDEF A Classic Mac OS 1989.12.15
Appearance of Lehigh virus (discovered at its namesake university), [20] boot sector viruses such as Yale from the US, Stoned from New Zealand, Ping Pong from Italy, and appearance of the first self-encrypting file virus, Cascade. Lehigh was stopped on campus before it spread to the "wild" (to computers beyond the university), and as a result ...
It can re-infect .EXE files, and will increase the size of already infected .EXE files by 1,808 bytes. [10] Jerusalem-VT1: If the virus is memory-resident, it will delete any file run on Tuesday the 1st. [10] Jerusalem-T13: The virus causes .COM and .EXE files to grow by 1,812 bytes. If the virus is memory-resident, it will delete any program ...