Virus Name: Spectral
V Status: New
Discovered: December, 1996
Symptoms: .COM file growth; decrease in available free memory
Eff Length: 907 Bytes
Type Code: PRhCK - Parasitic Resident .COM Infector
Detection Method: NAV, NAVDX, AVTK, ViruScan, PCScan,
NAV/N, AVTK/N, NShld
Removal Instructions: Delete infected files
The Spectral or Spectral.907 virus was received in December, 1996.
Its origin or point of isolation is unknown. The virus is a memory
resident fast infector of .COM files, including COMMAND.COM.
When the first Spectral 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 1,904 bytes. Interrupt 21 will be hooked by the
virus in memory.
Once the Spectral virus is memory resident, it will infect .COM files
when they are executed or opened, but not when copied. Infected
programs will have a file length increase of 907 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. The following
text strings are encrypted within the viral code:
"The Screaching Weasel is installed."
"By Spectral Shadow"
It is unknown what this virus may do besides replicate.