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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No25.1744
Description No25.1744
These are not dangerous memory resident parasitic stealth viruses, "No25.1894" is encrypted. They hook INT 21h and write themselves to the end of COM and EXE files that are executed or closed. The viruses use anti-debugging tricks. Depending on their counters they display the message:
Made in No.25 middle school which lived in Beijing China.
No444.474
Description No444.474
It is a harmless dangerous memory resident parasitic virus. It hooks INT 21h, 2Fh and writes itself to the end of .COM files that are executed. The virus contains a code that erases the MBR of the hard drive, but this code is never executed. The virus contains the text:
* SCHOOL No.444,MOSCOW *
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