Uta Virus

Virus Name: Uta Aliases: Uta.670 V Status: New Discovered: July, 1995 Symptoms: .COM file growth; decrease in total system & available free memory Origin: Unknown Eff Length: 670 Bytes Type Code: PRtCK - Parasitic Resident .COM Infector Detection Method: VAlert, AVTK, NAV, NAVDX, IBMAV, ViruScan, F-Prot, ChAV, NAV/N, IBMAV/N, NShld, AVTK/N, LProt, Innoc 4.0+ Removal Instructions: Delete infected files General Comments: The Uta or Uta.670 virus was received in July, 1995. Its origin or point of isolation is unknown. Uta is a memory resident infector of .COM files, including COMMAND.COM. When the first Uta infected program is executed, this 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 from DOS 5.0, will have decreased by 2,048 bytes. Interrupts 21, 22, and 24 will be hooked by the virus in memory. Once the Uta virus is memory resident, it will infect .COM programs when they are executed or opened, but not on copy. Infected .COM files will have a file length increase of 670 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 visible within the viral code: "UŠta" "COum"