HH&H Virus

Virus Name: HH&H Aliases: Gomb, GMB V Status: Rare Discovered: April, 1992 Symptoms: .COM file growth; decrease in total system and available free memory; file date/time change Origin: Unknown Eff Length: 4,091 Bytes Type Code: PRhCK - Parasitic Resident .COM Infector Detection Method: AVTK, ViruScan, F-Prot, IBMAV, ChAV, Sweep, NAV, NAVDX, VAlert, PCScan, NShld, Sweep/N, LProt, Innoc, NProt, IBMAV/N, AVTK/N, NAV/N Removal Instructions: Delete infected files General Comments: The HH&H virus was submitted in April, 1992. Its origin is unknown. HH&H is a memory resident infector of .COM programs, including COMMAND.COM. When the first HH&H infected program is executed, the HH&H virus will install itself memory resident at the top of system memory but below the 640K DOS boundary. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 6,144 bytes. Interrupts 1C and 21 will be hooked by HH&H in memory. Once the HH&H virus is memory resident, it will infect .COM programs over approximately 8K in size when they are executed. If COMMAND.COM is executed, it will become infected. Programs infected with the HH&H virus will have a file length increase of 4,091 bytes. The virus will be located at the end of the program. The file'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 encrypted within the HH&H virus' code, and hence are not visible in infected files: "HARD HIT & HEAVY HATE the HUMANS!!" "[ H.H.& H.H. ]" It is unknown what HH&H does besides replicate.