Virus Name: Night
V Status: New
Discovered: July, 1995
Symptoms: .COM & .EXE growth; file date/time seconds = "62";
decrease in available free memory
Eff Length: 2,048 - 2,062 Bytes
Type Code: PRhA - Parasitic Resident .COM & .EXE Infector
Detection Method: F-Prot, AVTK, VAlert, ViruScan, Sweep, IBMAV,
NAV, NAVDX, ChAV,
Sweep/N, NShld, IBMAV/N, AVTK/N, NAV/N, Innoc
Removal Instructions: Delete infected files
The Night virus was received in July, 1995. Its origin or point
of isolation is unknown. Night is a memory resident infector of
.COM and .EXE files, but not COMMAND.COM.
When the first Night 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 2,576 bytes. Interrupt 12's return will not
be moved. Interrupt 21 will be hooked by the virus in memory.
Once the Night virus is memory resident, it will infect .COM and
.EXE files when they are executed. Infected programs will have a
file length increase of 2,048 to 2,062 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 appear to be altered, though the
seconds field will have been set to "62", the infection marker for
the virus. No text strings are visible within the viral code.
It is unknown what the Night virus may do besides replicate.