Marian Virus

Virus Name: Marian Aliases: Marian.700 V Status: New Discovered: January, 1996 Symptoms: .COM & .EXE growth; file date/time changes; decrease in available free memory Origin: Unknown Eff Length: 700 Bytes Type Code: PRhAK - Parasitic Resident .COM & .EXE Infector Detection Method: NAV, NAVDX, IBMAV, ViruScan, IBMAV, VAlert, AVTK, F-Prot, ChAV, PCScan, NAV/N, NShld, IBMAV/N, AVTK/N, Innoc Removal Instructions: Delete infected files General Comments: The Marian or Marian.700 virus was received in January, 1996. Its origin or point of isolation is unknown, though it may be from Eastern Europe. Marian is a memory resident fast infector of .COM and .EXE files, including COMMAND.COM. When the first Marian 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 992 bytes. Interrupt 21 will be hooked by the virus in memory. Once the Marian virus is memory resident, it will infect .COM and .EXE files, including COMMAND.COM, when they are executed or opened, but not on copy. Infected files will have a file length increase of 700 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 infected files: "BULPACK BBS - PLOVDIV" "Copyright (c) Marian Delkinov" "PEDY PATENT."