Trebujena Virus

Virus Name: Trebujena Aliases: Trebujena.1094 V Status: New Discovered: January, 1996 Symptoms: .COM file growth; decrease in available free memory Origin: Argentina Eff Length: 1,094 Bytes Type Code: PRhCK - Parasitic Resident .COM Infector Detection Method: ChAV, AVTK, IBMAV, NAV, NAVDX, ViruScan, Innoc, AVTK/N, IBMAV/N, NAV/N, NShld Removal Instructions: Delete infected files General Comments: The Trebujena virus was received in January, 1996, and appears to be from Argentina. This virus is a memory resident infector of .COM files, including COMMAND.COM. It does not infect very small .COM files. When the first Trebujena 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 1,600 bytes. Interrupt 21 will be hooked by the virus in memory. Once the Trebujena virus is memory resident, it will infect .COM files, except for very small ones, when they are executed. Infected files will have a file length increase of 1,094 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 string is visible within the viral code in all infected files: "Trebujena" It is unknown what this virus may do besides replicate.