checksum famil
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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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