Legozz Virus

Virus Name: Legozz Aliases: Legozz.1000 V Status: New Discovered: July, 1995 Symptoms: .COM & .EXE growth; decrease in available free memory Origin: Unknown Eff Length: 1,000 Bytes Type Code: PRhAK - Parasitic Resident .COM & .EXE Infector Detection Method: F-Prot, AVTK, Sweep, NAV, NAVDX, ViruScan, IBMAV, PCScan, ChAV, Sweep/N, NAV/N, AVTK/N, NProt, IBMAV/N, NShld, Innoc 4.0+ Removal Instructions: Delete infected files General Comments: The Legozz virus was received in July, 1995. Its origin or point of isolation is unknown. Legozz is a memory resident infector of .COM and .EXE files, including COMMAND.COM. When the first Legozz 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 5,632 bytes. Interrupt 21 will be hooked by the virus in memory. Once the Legozz virus is memory resident, it will infect .COM and .EXE files, including COMMAND.COM, when they are executed. Infected programs will have a file length increase of 1,000 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 viral code: "Szetszedtem a geped! Rakd ossze, LEGO-zz!" "LEGO virus" "MESTER (C) 1995" It is unknown what the Legozz virus may do besides replicate.