Virus Name: Major
V Status: In the wild
Discovered: July, 1996
Symptoms: .EXE file growth; decrease in available free memory
Eff Length: 1,644 - 1,660 Bytes
Type Code: PRhE - Parasitic Resident .EXE Infector
Detection Method: AVTK 7.61+, IBMAV, ViruScan 2.51+, PCScan 5.02+,
NAV 3.09 9608+, NAVBoot 0.A 9608+, ChAV,
AVTK/N 7.61+, IBMAV/N, NShld 2.32 9607+,
NAV/N 2.0 9608+
Removal Instructions: Delete infected files
The Major virus was received in July, 1996, and has been reported
to be "in the wild". It appears to be from Poland. This virus is
a memory resident infector of .EXE files.
When the first Major 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 30,384 bytes. Interrupts 08 and 21 will be
hooked by the virus in memory.
Once the Major virus is memory resident, it will infect .EXE files
when they are executed. Infected programs will have a file length
increase of 1,644 to 1,660 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 Major BBS Virus created by Major tomTugger"
It is unknown what this virus may do besides replicate, though it
should be assumed that it will interfer with the functionality or
corrupt the Major BBS programs.