ECU Virus

Virus Name: ECU Aliases: V Status: Rare Discovered: March, 1993 Symptoms: .EXE file growth; decrease in total system and available free memory Origin: England 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 General Comments: 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.