GS.525
Description GS.525
This is a harmless memory resident virus which hooks INT 21h and infects by standard way the COM-files that are started which begin from JMP NEAR (E9h) opcode only. The string "GS/02" is present at the beginning of infected files and at the virus entry point.
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Horse.1154.a
Description Horse.1154.a
There are not dangerous memory resident parasitic viruses. They hook INT 8, 21h and write themselves to the end of COM and EXE files that are executed or closed. While infecting the viruses use the undocumented System File Table. The viruses trace interrupts, periodically manifest themselves by a sound or the video-effects. They contain the text strings like:
Sofia,Jan/Feb 1991 (c) Naughty Hacker.
Sofia,Feb '91 Naughty Hacker.
HS.1221
Description HS.1221
This is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files (except AIDSTEST.EXE) that are executed. On December, 27th it hooks INT 17h and prints the messages in Russian.
The virus contains the text string:
COMSPEC=
SNAIDSTESTCOMEXE
HS86.42 Ver 4.09.Copyright by EA computers inc.1994
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