Error Virus

Virus Name: Error Aliases: V Status: Rare Discovered: October, 1991 Symptoms: .EXE file growth; file date/time change; messages when user attempts to execute programs Origin: Argentina Eff Length: 628 - 642 Bytes Type Code: PRhE - Parasitic Resident .EXE Infector Detection Method: ViruScan, AVTK, F-Prot, IBMAV, ChAV, NAV, Sweep, NAVDX, VAlert, PCScan, NShld, LProt, Innoc, AVTK/N, Sweep/N, NAV/N, IBMAV/N Removal Instructions: Delete infected files General Comments: The Error virus was discovered in Argentina in October, 1991. Error is a memory resident infector of .EXE programs. The first time a program infected with Error is executed, the Error virus will become memory resident, hooking interrupt 21. Once resident, any attempt by the system user to execute a program or DOS command will result in an error message being displayed. The error message may be "Exec failure" or "Bad Command or file name". Additionally, if the program the user was attempting to execute had the Read-Only attribute set, it will reset the attribute. Error will sometimes infect .EXE programs which are executed after the virus has become memory resident. When it does infect .EXE programs, the program will increase in size by 628 to 642 bytes with the virus being located at the end of the infected file. The file's date and time in the DOS disk directory will have been updated to the current system date and time when infection occurred. No text messages appear within the Error virus' code in infected programs.