Hi Virus

Virus Name: Hi Aliases: Hi.460 V Status: Rare Discovered: August, 1992 Symptoms: .EXE file growth; file date/time changes; decrease in total system and available memory Origin: Eastern Europe Eff Length: 460 Bytes Type Code: PRtE - Parasitic Resident .EXE Infector Detection Method: F-Prot, Sweep, ViruScan, IBMAV, AVTK, NAV, NAVDX, VAlert, PCScan, ChAV, NShld, Sweep/N, Innoc, NProt, AVTK/N, LProt, IBMAV/N, NAV/N Removal Instructions: Delete infected files General Comments: The Hi virus was submitted in August, 1992. It is originally from Eastern Europe. Hi is a memory resident infector of .EXE programs. When the first Hi infected program is executed, the Hi 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. Interrupt 21 will be hooked by the virus. Once the Hi virus is memory resident, it will infect .EXE programs when they are executed. Infected programs will have a file length increase of 460 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 string can be found near the end of all infected programs: "Hi" Known variant(s) of Hi are: Hi.892: Received in January, 1996, this is an 892 byte variant of the Hi virus described above. Its size in memory is also 1,024 bytes, hooking interrupt 21. Like the original virus, it infects .EXE files when they are executed. Infected files will have a file length increase of 892 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 not be altered. No significant text strings are visible within the viral code. Origin: Unknown January, 1996.