Virus Name: ECU
V Status: Rare
Discovered: March, 1993
Symptoms: .EXE file growth; decrease in total system and available free
Eff Length: 711 Bytes
Type Code: PRhE - Parasitic Resident .EXE Infector
Detection Method: Sweep, AVTK, F-Prot, ViruScan, IBMAV,
NAV, NAVDX, VAlert, PCScan, ChAV,
Sweep/N, NShld, AVTK/N, IBMAV/N, Innoc, NAV/N, LProt
Removal Instructions: Delete infected files
The ECU virus was submitted in March, 1993, and is originally from
England. ECU is a memory resident infector of .EXE programs. It
spreads quickly on infected systems.
When the first ECU infected program is executed, the ECU virus will
install itself memory resident at the top of system memory but
below the 640K DOS boundary, hooking interrupts 01, 03, 08, and 21.
Total system and available free memory, as indicated by the DOS
CHKDSK program, will have decreased by 1,488 bytes. Interrupt 12's
return will not be moved.
Once the ECU virus is memory resident, it will infect .EXE programs
when they are executed or opened for any reason. Infected .EXE
programs will have a file length increase of 711 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 ECU viral code:
"[ECU] So This is a Well Hard ECU!"
"Apache Warrior, ARCV Pres."
It is unknown what ECU does besides replicate.