Monday.499
Description Monday.499
This is a very dangerous non-memory resident parasitic virus. It searches for .COM files, and writes itself to the beginning if the file. On Monday, it displays:
I don't like mondays all
then it halts the computer and formats the hard disk sectors.
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ScreenMixer.1072
Description ScreenMixer.1072
It is not a dangerous memory resident partly encrypted parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are executed or accessed by FCB FindFirst/Next DOS calls (DIR command). Depending on the system timer the virus mixes the letters on the screen.
Script.Inf
Description Script.Inf
This is a script virus that infects Windows INF files. These INF files contain the information that is used during installation a new software, or upgrading already installed programs. They are activated on entering the "Install" item in the context menu of Windows Explorer. To replicate itself the virus uses special script language that is used in the INF files.
When a software with infected INF file is installing, Windows looks for INF file in the package, opens it and processes instructions including virus script commands. The virus code when activated creates the VXER.TXT file, copies the host file to there and appends several DOS commands to the end of the AUTOEXEC.BAT file. On rebooting these commands search for first *.INF file in the WindowsInf directory on the current drive and overwrite it with virus code that was stored in the VXER.TXT file.
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