Virus Name: Ozzy
V Status: New
Discovered: January, 1996
Symptoms: .COM & .EXE file growth;
decrease in available free memory
Eff Length: 546 - 560 Bytes
Type Code: PRhAK - Parasitic Resident .COM & .EXE Infector
Detection Method: AVTK, IBMAV, ViruScan, NAV, NAVDX, ChAV,
NAV/N, AVTK/N, NShld 2.33+
Removal Instructions: Delete infected files
The Ozzy virus was received in January, 1996. Its origin or point
of isolation is unknown. Ozzy is a memory resident infector of
.COM and .EXE files, including COMMAND.COM.
When the first Ozzy 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 624 bytes. Interrupts 21 and 22
will be hooked by the virus in memory.
Once the Ozzy virus is memory resident, it will infect .COM and
.EXE files when they are executed. Infected .COM files will
increase in size by 546 bytes while .EXE files increase in size
by 546 to 560 bytes. In both cases, the virus will be 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 string
is visible within the viral code:
"Ozzy Osbourne virus por El Flaco"