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It also changes the field 0Ch in the .EXE file's header to FFAAh. The virus identifies itself from memory by using the interrupt INT 21, AX=3521h which it has hooked. All the checks work correctly and the virus won't infect files multiple times and it installs itself to memory only once.
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.
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 ...
The Fun.Exe virus is of the w32.Assarm family of computer viruses. According to Symantec [1] it registers itself as a Windows system process then periodically sends mail with spreading attachments as a response to any unopened emails in Outlook Express. This virus first appeared in early 2008 and is now recognized by most anti virus programs.