Ienez Virus

Virus Name: Ienez Aliases: Ienez.1428 V Status: New Discovered: January, 1995 Symptoms: .EXE file growth; decrease in available free memory; DOS CHKDSK file allocation errors; file date/time seconds = "62" Origin: Unknown Eff Length: 1,428 - 1,442 Bytes Type Code: PRhE - Parasitic Resident .EXE Infector Detection Method: F-Prot, IBMAV, AVTK, Sweep, ViruScan, NAVDX, VAlert, NAV, PCScan, ChAV, IBMAV/N, AVTK/N, Sweep/N, NShld, NAV/N, Innoc 4.0+ Removal Instructions: Delete infected files General Comments: The Ienez virus was received in January, 1995. Its origin or point of isolation is unknown. Ienez is a memory resident infector of .EXE files. When the first Ienez 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 5.0 CHKDSK program, will have decreased by approximately 1,440 bytes. Interrupts 17 and 21 will be hooked by the virus in memory. Once the Ienez virus is memory resident, it will infect .EXE files when they are executed or opened, but not on copy. Programs infected by the Ienez virus will have a file length increase of 1,428 to 1,442 bytes, though 1,428 bytes of this file length increase will be hidden by the virus when it is memory resident. The file's date and time in the DOS disk directory listing will not be altered. The virus will be located at the end of infected files. The following text strings are encrypted within the Ienez viral code: "IENEZ II 29-9-93 VETO !!!" "IENEZ II (c) DEATHMAN 1993" The DOS CHKDSK program will indicate file allocation errors on Ienez infected programs, except those which increased in size by 1,428 bytes. It is unknown what the Ienez virus does besides replicate.