F-Secure Virus Descriptions : MPS-OPC

NAME:	MPS-OPC
ORIGIN:	Poland
SIZE:	640/654
TYPE:	Non-resident COM-files
REPAIR:	Yes

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.

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.