Pay Rise Virus

Virus Name: Pay Rise Aliases: Dennis, Pay Rise-897 V Status: Rare Discovered: March, 1993 Symptoms: .COM & .EXE growth; decrease in total system & available free memory Origin: England Eff Length: 897 Bytes Type Code: PRhAK - Parasitic Resident .COM & .EXE Infector Detection Method: Sweep, AVTK, F-Prot, ViruScan, PCScan, IBMAV, NAV, NAVDX, VAlert, ChAV, Sweep/N, NShld, AVTK/N, IBMAV/N, Innoc, NAV/N, LProt Removal Instructions: Delete infected files General Comments: The Pay Rise, Pay Rise-897 or Dennis, virus was submitted in March, 1993. It is originally from England. Pay Rise is a memory resident infector of .COM and .EXE programs, including COMMAND.COM. When the first Pay Rise infected program is executed, the Pay Rise virus will install itself memory resident at the top of system memory but below the 640K DOS boundary. It does not move interrupt 12's return. Total system and available free memory, as indicated by the DOS CHKDSK program, will have decreased by 1,872 bytes. Interrupt 21 will be hooked by the Pay Rise virus in memory. Once memory resident, the Pay Rise virus will infect .COM and .EXE programs when they are executed. Infected programs will have a file length increase of 897 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. The following text strings are encrypted within the Pay Rise viral code: "[Dennis-1] Apache Warrior, -= ARCV =-." "To Dennis Yelle You Need A Pay Rise!" "McAfee Eat Lead............" It is unknown what Pay Rise may do besides replicate. Known variant(s) of Pay Rise are: Pay Rise-874: An 874 byte variant of the Pay Rise virus described above, this variant's size in memory is 1,824 bytes, hooking interrupt 21. It adds 874 bytes to the .COM and .EXE programs it infects, and contains the same encrypted text strings as the original virus. Origin: England March, 1993.