Amber
Description Amber
It is a harmless memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are closed. This virus is stealth on FindFist/Next calls. When several anti-viruses or file compressing utilities are run (ADINF, WEB, AIDSTEST, SCAN, ARJ, ZIP, LHA, RAR), the virus disables its stealth branches. The virus contains the text strings:
NFEBSTANRJIPHAAR
[·This is only ForeWord·]
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04h.635
Description 04h.635
This is a harmless memory resident parasitic virus. It hooks INT 21h. On DOS calls FindFirst (AH=4Eh), it searches for COM files and writes itself to the beginning of the file. The virus contains the encrypted text strings:
04h Virus*.com
10past3.a
Description 10past3.a
This is a dangerous, memory-resident parasitic virus. It hooks INT 9 and 21h, and sets INT 1 and 3 to HOLD RESET address, and writes itself to the end of the COM files that are executed or loaded into the memory for debugging or as overlays.
While creating a TSR copy, this virus do not modify the MCB chain, and may halt the system. When the INT 9 is called (keyboard), the virus may change keyboard flags.
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