Virus Name: 708
V Status: Rare
Discovery: August, 1993
Symptoms: .COM file growth; TSR; file date/time changes;
.COM file corruption; system hangs
Eff Length: 708 Bytes
Type Code: PRsCK - Parasitic Resident COM Infector
Detection Method: ViruScan, F-Prot, AVTK, IBMAV, NAV,
NAVDX, PCScan, ChAV,
NShld, NProt, IBMAV/N, AVTK/N, NAV/N, LProt
Removal Instructions: Delete infected files
The 708 virus was submitted in August, 1993. Its origin or
point of isolation is unknown. 708 is a memory resident direct
action infector of .COM programs, including COMMAND.COM.
The first time a program infected with the 708 virus is executed,
the 708 virus will install itself memory resident as a low system
memory TSR of 1,040 bytes. Interrupt 08 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
Once the 708 virus is memory resident, it will infect three .COM
programs located in the current directory when an infected program
is executed. Infected programs will have a file length increase of
708 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 current system date and time when infection occurred.
The following text strings are encrypted within the 708 viral code:
"Bad command or file name"
"C:\COMMAND.COM C:\COMMAND .COM *.COM .."
The 708 virus will occassionally corrupt the programs it attempts
to infect. These corrupted programs will have the first three bytes
altered, no file length increase will occur. The file's date and
time in the DOS disk directory listing will not be altered.
Execution of one of these corrupted programs will result in a