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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Bob.718.a
Description Bob.718.a
This is a very dangerous not memory resident virus which scans the subdirectory tree and writes itself into the .COM-files beginnings. This virus contains the text strings "*.COM", "COMMAND.COM". On 1993 year this virus will overwrite the files by a small program which types: "Program terminated normally".
Bobas.754
Description Bobas.754
These are dangerous memory resident parasitic viruses. They hook INT 9, 21h and write themselves to the end of EXE files that are executed or opened. Depending on their internal counters the viruses display the messages and corrupt the CMOS:
"Bobas.754": VIRUS :BOBAS v1.1
"Bobas.814": VIRUS :BOBAS v1.2
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