MPS 1.1 Virus
Virus Name: MPS 1.1
Aliases: MPS-OPC 1.1
V Status: Rare
Discovered: November, 1991
Symptoms: .COM file growth; file date/time change; program execution
Eff Length: 469 Bytes
Type Code: PNCK - Parasitic Non-Resident .COM Infector
Detection Method: ViruScan, AVTK, Sweep, F-Prot, ChAV,
IBMAV, NAV, NAVDX, VAlert, PCScan,
NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, NAV/N,
Removal Instructions: Delete infected files
The MPS 1.1 virus was submitted in November, 1991. It is originally
from Poland. MPS 1.1 is a non-resident, direct action infector of
.COM programs, including COMMAND.COM.
When a program infected with MPS 1.1 is executed, the virus will
infect all .COM programs located in the current directory. If
COMMAND.COM is located in this directory, it will be infected as
MPS 1.1 infected programs will have a file length increase of
469 bytes with the virus being located at the end of the file.
The program's date and time in the DOS disk directory will have
been updated to the system date and time when infection occurred.
The following text string can be found within the viral code
in MPS 1.1 infected programs:
"MPS-OPC 1991 v1.1 *.COM"
A symptom of an MPS 1.1 infection is that programs requiring
command line input may not function properly, returning unexpected
It is unknown if MPS 1.1 carries any destructive potential.
See: MPS 3.1 MPS 3.2 MPS 4.01 MPS II-754