Sparse.3840.a
Description Sparse.3840.a
This is a harmless memory resident parasitic virus. It hooks INT 21h and writes itself to the beginning of .COM files that are executed. The major part of the virus (approximately 3K) contains only zero bytes that are never used. The part of actual virus code is divided by 3 areas which are 'sparsed' in the virus body.
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Simbioz.331
Description Simbioz.331
It is a harmless nonmemory resident parasitic virus. It searches for .COM files in the current directory, then writes itself to the end of the file. The virus writes CALL_Virus instruction to the middle of the file. To do that it scans the file for the B4h ?? CDh 21h bytes (MOV AH,?? ; INT 21h call) and replaces these bytes with CALL_Virus code. Before return to the host program the virus restores these bytes.
The virus does not manifest itself in any way. It contains the text strings:
*.com [Simbioz.Inside]
Simple
Description Simple
It is a harmless nonmemory resident parasitic virus. It searches for C:COMMAND.COM and the .COM files of the current directory and writes itself to the end of the file. It contains the text strings:
SIMPLE 1992 (c)
*.COM
C:COMMAND.COM
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