Klubb Virus

Virus Name: Klubb Aliases: Klubb.494 V Status: New Discovered: January, 1996 Symptoms: .COM file growth; decrease in available free memory Origin: Unknown Eff Length: 494 Bytes Type Code: PRhCK - Parasitic Resident .COM Infector Detection Method: F-Prot, AVTK, IBMAV, ViruScan, NAV, NAVDX, ChAV, Innoc, NProt, AVTK/N, IBMAV/N, NShld, NAV/N Removal Instructions: Delete infected files General Comments: The Klubb virus was received in January, 1996. Its origin or point of isolation is unknown. Klubb is a memory resident infector of .COM programs, including COMMAND.COM. When the first Klubb 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 CHKDSK program from DOS 5.0, will have decreased by 5,120 bytes. Interrupt 21 will be hooked by the virus in memory. Once the Klubb virus is memory resident, it will infect .COM programs, including COMMAND.COM, when they are executed. Infected programs will have a file length increase of 494 bytes with the virus being located at the beginning of the file. The program's date and time in the DOS disk directory listing will not be altered. No text strings are visible within the viral code.