CheckSum Family
Description CheckSum Family
These are memory resident harmless parasitic viruses. They trace and hook INT 21h and write themselves to the end of each 8th COM- or EXE-file that is loaded into the system memory ("CheckSum.1232,1233" hit COM-files only). On execution, they calculate the checksum of the virus body and if this sum is not correct they pass the control to DOS. "CheckSum.3022" contains a text in Russian.
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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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