Shock Therapy Virus
Virus Name: Shock Therapy
V Status: Rare
Discovered: April, 1993
Symptoms: .COM & .EXE growth;
decrease in total system & available free memory
Eff Length: 620 Bytes
Type Code: PRtAK - Parasitic Resident .COM & .EXE Infector
Detection Method: AVTK, F-Prot, ViruScan, Sweep, IBMAV,
NAV, NAVDX, VAlert, PCScan,
NShld, Sweep/N, NProt, AVTK/N, NAV/N, IBMAV/N, LProt
Removal Instructions: Delete infected files
The Shock Therapy virus was submitted in April, 1993. Its origin
or point of isolation is unknown. Shock Therapy is a memory resident
infector of .COM and .EXE programs, including COMMAND.COM.
When the first Shock Therapy infected program is executed, the
Shock Therapy virus will install itself memory resident at the top
of system memory but below the 640K DOS boundary, moving interrupt
12's return. Total system and available free memory, as indicated
by the DOS CHKDSK program, will have decreased by 2,048 bytes.
Interrupt 21 will be hooked by Shock Therapy in memory.
Once the Shock Therapy virus is memory resident, it will infect .COM
and .EXE programs, including COMMAND.COM, when they are executed.
Infected programs will have a file length increase of 620 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 be altered. The
following text strings are encrypted within the Shock Therapy virus,
thus not visible within infected files:
"Your HD is TOAST!Thanx to Shock Therapy!"
It is unknown what Shock Therapy does besides replicate.