Virus Name: Groove
V Status: Rare
Discovered: June, 1992
Symptoms: .COM & .EXE growth; decrease in total system & available free
memory; deletes/corrupts anti-viral program data files;
file date/time changes; programs don't function properly;
Eff Length: 3,646 - 3,708 Bytes
Type Code: PRhAK - Parasitic Resident .COM &.EXE Infector
Detection Method: ViruScan, F-Prot, AVTK, ChAV,
Sweep, IBMAV, NAV, NAVDX, VAlert, PCScan,
Sweep/N, Innoc, AVTK/N, NAV/N, NProt, IBMAV/N, NShld,
Removal Instructions: Delete infected files
The Groove virus was received in June, 1992. It was originally
isolated in Germany, where it is reported to be in the public
domain. Groove is a memory resident infector of .COM and .EXE
programs which uses a slightly modified version of the Dark
Avenger Mutation Engine (DAME) for encryption.
When the first program infected with the Groove virus is executed,
Groove will install itself memory resident at the top of system
memory but below the 640K DOS boundary. It will have hooked
Once the Groove virus is memory resident, it will infect .COM
programs, including COMMAND.COM, when they are executed. It will
also infect .EXE programs, but only very small ones. Infected
programs will have a file length increase of 3,646 to 3,708 bytes.
The virus will be located at the end of the file. The program's date
and time in the DOS disk directory listing will have been updated to
the current system date and time when infection occurred.
The Groove virus contains the following text strings, though they
are usually encrypted in infected programs so that they are not
"Dont wory, you are not alone at this hour...
ThisVirus is NOT dedicated to Sara
its dedicated to her Groove (...Thats my name)
This Virus is only a test Virus there for
be ready for my Next Test ...."
"C:\NAV_._NO C:\NOVIRCVR.CTS C:\NOVIPERF.DAT
C:\UNTOUCH\UT.UT1 C:\UNTOUCH\UT.UT2 C:\VS.VS"
The second set of text above are the names of data files for the
following anti-viral utilities which have been targetted by the
author of this virus: Symantec's Norton Anti-Virus, Certus' Novi,
Central Point Anti-Virus, Dr. Solomon's Anti-Viral Toolkit,
Fifth Generation Systems' Untouchable, and XTree's ViruSafe. The
virus will attempt to corrupt or delete these datafiles if they
Besides the deletion or other corruption of the above indicated
data files, systems infected with the Groove virus will have
difficulty executing infected programs. Infected programs will
usually not function properly, giving unpredictable results. If
COMMAND.COM becomes infected, boot failures may also occur.
See: DAME Pogue