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  4. MPS-OPC

MPS-OPC

ORIGIN:Poland
SIZE:640/654
TYPE:Non-Resident COM-files
REPAIR:Yes

Summary

The 640 byte variant contains the text

(C) MPS-OPC 1991 v3.1
but the 654 byte one claims to be version 3.2. Not yet analyzed.

Additional Details

VARIANT:MPS-OPC 1.1
A 469 byte version.

VARIANT:Slow load
Probably the first version - 376 bytes.

VARIANT:MPS-OPC 4.01
This virus is structurally different, and belongs to a different family, as it only infects .EXE files, but it is probably written by the same authors.