Green Caterpillar-1989 Virus
Virus Name: Green Caterpillar-1989
V Status: Rare
Discovered: February, 1994
Symptoms: .COM & .EXE file growth; file date/time changes;
decrease in total system & available free memory
Eff Length: 1,991 - 2,005 Bytes
Type Code: PRhAK - Parasitic Resident .COM & .EXE Infector
Detection Method: ViruScan, F-Prot, AVTK, NAV, NAVDX,
IBMAV, Sweep, VAlert, PCScan, ChAV,
NShld, NProt, AVTK/N, NAV/N, IBMAV/N, Sweep/N, LProt,
Removal Instructions: Delete infected files
The Green Caterpillar-1989 virus was received in February, 1994. Its
origin or point of isolation is unknown. This virus is a memory
resident infector of .COM and .EXE programs, including COMMAND.COM.
It is based on the 1575 or Green Caterpillar virus.
When the first Green Caterpillar-1989 infected program is executed,
this virus will become memory resident at the top of system memory
but below the 640K DOS boundary, not moving interrupt 12's return.
Total system and available free memory, as indicated by the DOS CHKDSK
program, will have decreased by 2,256 bytes. Interrupt 21 will be
hooked by the virus in memory. Also at this time, the virus will
infect the copy of COMMAND.COM located in the C: drive root directory
if it was not previously infected.
Once memory resident, the Green Caterpillar-1989 virus will infect
.COM and .EXE programs when they are executed, as well as one file
included in the target directory of DOS DIR commands. Programs
infected with this virus will have a file length increase of 1,991 to
2,005 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 have
been updated to the current system date and time when infection
occurred. The following text strings are visible within the viral
code in all Green Caterpillar-1989 infected files:
"Bloody! June 4th
"Made in Chengdun/"
"/t/h/e/ /e/y/e/s/,/y/o/u/'/r/e/ /p/a/r/a/l/y/z"
"It's close to midnight and something,
evil's lurking in the dark."
"Under the moonlight you see a sight,
that almost stops your heart."
"You try to scream but terror,
takes the sound before you make it."
"You start to freeze as horror looks."
"You right between the eyes,you're paralyzed."
"Cause this is thriller,thriller night,
and no one's gonna save you from the beast about to strike."
"You know it's thriller night.
You're fighting for your life!...(LHB)?!"
It is unknown what Green Caterpillar-1989 does besides replicate.