Slub Virus

Virus Name: Slub Aliases: V Status: Rare Discovered: July, 1994 Symptoms: .COM file growth; file date/time changes; decrease in total system & available free memory Origin: Unknown Eff Length: 1,024 Bytes Type Code: PRhCK - Resident Parasitic .COM Infector Detection Method: F-Prot, AVTK, IBMAV, ViruScan, Sweep, NAV, NAVDX, VAlert, AVTK/N, Sweep/N, NProt, IBMAV/N, NShld, NAV/N Removal Instructions: Delete infected files General Comments: The Slub virus was received in July, 1994. Its origin or point of isolation is unknown. Slub is a memory resident infector of .COM programs, including COMMAND.COM. When the first Slub infected program is executed, this virus will become memory resident at the top of system memory but below the 640K DOS boundary, not 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. Interrupt 21 will be hooked by the virus in memory. Also at this time, the virus will infect two .COM programs located in the current directory. Once the Slub virus is memory resident, it will infect up to four .COM programs in the current directory when any program is executed. Infected programs will have a file length increase of 1,024 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. The following text strings are visible within the viral code in all Slub infected programs: "c:\autoexec.bat c:\slubdestr.n23" "????????COM" "*.com"