Vpp.475
Description Vpp.475
It is not a dangerous nonmemory resident parasitic virus. It searches for COM files, then writes itself to the end of the file. The virus infects a file only if it contains in its first 1024 bytes of code the interrupt calls: INT 10h (video service) or INT 21h into. In this case the virus replaces this interrupt call with the call to virus code instruction. Because of this way of infection the virus gets control not at the moment the infected programs starts, but only in case the affected program's branch takes control.
The virus writes the ID string "V++" to the end of infected files, and by detecting this sting avoids duplicate infection.
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Shel.983
Description Shel.983
It is a harmless memory resident encrypted parasitic virus. It hooks INT 21h and intercepts DOS calls Execute and ChangeDir. When such calls are performed, the virus searches for COM- and EXE- files, then writes itself to the end of the file. The virus does not infect the files: AI*.*, WP*.*, HI*.*, DO*.*, or KR*.*.
The virus contains the internal text string:
(?) Shel,NSTU,1994,v3.1
*.exe *.com
Sh
Shengli.1024
Description Shengli.1024
It is not a dangerous memory resident parasitic virus. It writes itself to the end of .COM and .EXE files. When and infected file is executed, the virus hooks INT 21h, infects the C:COMMAND.COM file, returns the control to the host program and then infects the files that are executed. On September 16th it displays the message and halts the computer:
Happy birthday to you
-SHENGLI OIL FIELD TXC
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