Kontragapi
Description Kontragapi
It is a dangerous memory resident polymorphic parasitic virus. The virus does work only if system date's year is 1998, otherwise the virus does not install itself into the system memory. While installing the virus hooks INT 21h and writes itself to the end of COM files that are accessed. The virus corrupts several anti-virus programs: if filename begins with F-, TB, AV, VIR, SCAN, KILL (F-PROT, TBAV, AVP etc), the virus writes to the file header a small program that displays the message:
kontragapi
This is the "Entry Point Obscuring" virus, i.e. there is no JMP_Virus instruction at the file header. The virus uses one of standard tricks to write the JMP_Virus to the middle of the file: it reads file header, disassembles it at looks for suitable place for the JMP_Virus code.
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AO.784
Description AO.784
It is a dangerous memory resident parasitic virus. It hooks INT 8, 10h, 21h and writes itself to the end of COM files that are accessed. Depending on its counters it corrupts the CMOS or reboots the computer. The header of infected files contains the ID-text:
ÄO0
Ap.272
Description Ap.272
It's a harmless memory resident parasitic virus. It hooks INT 21h and writes itself at the end of COM-files are executed. It contains the internal ID-strings: "AP".
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