Virus Name: Gynx
V Status: New
Discovered: January, 1996
Symptoms: .COM file growth; file date/time seconds = "08";
decrease in available free memory
Eff Length: 1,000 Bytes
Type Code: PRhCK - Parasitic Resident .COM Infector
Detection Method: F-Prot, IBMAV, ViruScan, AVTK, NAV, NAVDX, ChAV,
IBMAV/N, NShld, NAV/N, AVTK/N, Innoc 4.0+
Removal Instructions: F-Prot, or Delete infected files
The Gynx or Gynx.1000 virus was received in January, 1996. Its
origin or point of isolation is unknown. Gynx is a memory resident
infector of .COM files, including COMMAND.COM.
When the first Gynx infected program is executed, this virus will
install itself memory resident at the top of system memory but
below the 640K DOS boundary, not moving interrupt 12's return.
Available free memory, as indicated by the DOS CHKDSK program from
DOS 5.0, will have decreased by 1,264 bytes. Interrupt 21 will be
hooked by the virus in memory. Also at this time, the virus will
infect the copies of MODE.COM and KEYB.COM located in the C:\DOS
directory if they were not previously infected by the virus.
Once the Gynx virus is memory resident, it will infect .COM files,
including COMMAND.COM, when they are executed or opened. Infected
.COM files will have a file length increase of 1,000 bytes with the
virus being located at the end of the file. The program's date and
time in the DOS disk directory listing will not appear to be
altered, though the seconds field will have been set to "08". The
following text strings are encrypted within the viral code:
"I walked in the jungle with my M-60,and what did I see.A big
fat nigger sitting in a tree.I was going to shoot him when he
started to pee!"
It is unknown what the Gynx virus may do besides replicate.