Virus Name: Quartz
V Status: New
Discovery: July, 1995
Symptoms: .COM & .EXE growth; decrease in available free memory
Eff Length: 1,420 - 1,426 Bytes
Type Code: PRhAK - Parasitic Resident .COM & .EXE Infector
Detection Method: F-Prot, AVTK, VAlert, ViruScan, Sweep, IBMAV,
PCScan, NAV, NAVDX, PCScan, ChAV,
NShld, Sweep/N, IBMAV/N, AVTK/N, LProt, NAV/N, Innoc 4.0+
Removal Instructions: Delete infected files
The Quartz virus was received in July, 1995. Its origin or point
of isolation is unknown. Quartz is a memory resident infector of
.COM and .EXE files, including COMMAND.COM.
When the first Quartz 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 1,696 bytes. Interrupts 1C and 21
will be hooked by the virus.
Once the Quartz virus is memory resident, it will infect .COM and
.EXE files when they are executed. Infected files will have a
file length increase of 1,420 to 1,426 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. No text strings
are visible within the viral code.
It is unknown what the Quartz virus may do besides replicate.