Virus Name: Sarampo
V Status: New
Discovery: July, 1995
Symptoms: .COM & .EXE growth; file date/time time = 1:13:00pm;
decrease in available free memory; system hangs
Eff Length: 1,371 Bytes
Type Code: PRhAK - Parasitic Resident .COM & .EXE Infector
Detection Method: F-Prot, AVTK, VAlert, ViruScan, Sweep, NAVDX, NAV,
IBMAV, PCScan, ChAV,
NShld, Sweep/N, NAV/N, IBMAV, AVTK/N, NProt, Innoc 4.0+
Removal Instructions: Delete infected files
The Sarampo or Sarampo.A virus was received in July, 1995, along
with one variant, Sarampo.B. Their origin or point of isolation is
unknown. Sarampo is a memory resident infector of .COM and .EXE
files, including COMMAND.COM.
When the first Sarampo infected .EXE program is executed, this virus
will install itself memory resident at the top of system memory but
below the 640K DOS boundary, hooking interrupt 21. Available free
memory, as indicated by the DOS CHKDSK program from DOS 5.0, will
have decreased by a minimum of 1,648 bytes, the size of the virus
in memory. The actual decrease in available free memory may be
much larger as the infection proceeds.
Once the virus is memory resident, it will infect .COM and .EXE
files when they are executed, though it does not infect all of
them. Infected programs will have a file length increase of 1,371
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 altered so that the time is set to "1:13:00pm". It will also
set the file time to this value on the .COM and .EXE files which
have been executed with the virus memory resident but were not
The following text strings can be found within the viral code in all
Sarampo infected programs:
"Do you like this Screen Saver ? I hope so"
"Created by Sarampo virus."
System hangs may occur when some infected .COM files are executed.
This virus appears to only infect COMMAND.COM if it is located in
the C: drive root directory.
Known variant(s) of Sarampo are:
Sarampo.B: Also received in July, 1995, this is a later variant
of the Sarampo virus described above. Its size in memory is
1,664 bytes, hooking interrupt 21. It infects .COM and .EXE
files on a consistent basis when they are executed with the
virus memory resident. Infected files will have a file length
increase of 1,371 bytes with the virus being located at the
end of the files. The time field in the file date time in the
DOS disk directory listing will have been set to 1:13:00pm. It
contains the same text strings as the original virus.
Origin: Unknown July, 1995.