Dejmi Virus

Virus Name: Dejmi Aliases: Susenka V Status: Rare Discovered: July, 1994 Symptoms: .COM file growth; file date/time changes; system hangs; decrease in total system & available free memory Origin: Unknown Eff Length: 862 Bytes Type Code: PRhCK - Parasitic Resident .COM Infector Detection Method: F-Prot, AVTK, IBMAV, ViruScan, Sweep, ChAV, NAV, NAVDX, VAlert, PCScan, NProt, AVTK/N, Sweep/N, IBMAV/N, Innoc, NShld, NAV/N, LProt Removal Instructions: Delete infected programs General Comments: The Dejmi virus was submitted in July, 1994. Its origin or point of isolation is unknown. Dejmi is a memory resident infector of .COM programs, including COMMAND.COM. When the first Dejmi infected program is executed, this virus will install itself memory resident at the top of system memory but below the 640K DOS boundary, moving interrupt 12's return. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 1,024 bytes. Interrupts 09, 1C, and 21 will be hooked by the virus in memory. Once memory resident, the Dejmi virus will infect .COM programs, including COMMAND.COM, when they are executed. Infected programs will have a file length increase of 862 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 have been updated to the current system date and time when infection occurred. No text strings are visible within the viral code in infected files.