Senorita Virus

Virus Name: Senorita Aliases: Senorita.885 V Status: New Discovered: January, 1996 Symptoms: .COM file growth; decrease in available free memory Origin: Unknown Eff Length: 885 Bytes Type Code: PRtCK - Parasitic Resident .COM Infector Detection Method: IBMAV, ViruScan, AVTK, NAV, NAVDX, F-Prot, PCScan, ChAV, IBMAV/N, AVTK/N, NShld, NAV/N, Innoc Removal Instructions: Delete infected files General Comments: The Senorita virus was received in January, 1996. Its origin or point of isolation is unknown. Senorita is a memory resident fast infector of .COM files, including COMMAND.COM. When the first Senorita 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. Available free memory, as indicated by the DOS CHKDSK program from DOS 5.0, will have decreased by 1,008 bytes. Interrupt 21 will be hooked by the virus in memory. Also at this time, the virus will infect the copies of COMMAND.COM located in the C: drive root directory and the C:\DOS directory. Once the Senorita virus is memory resident, it will infect .COM programs when they are executed or opened, but not when copied. Infected files will have a file length increase of 885 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 encrypted within the viral code: "C:\DOS\COMMAND.COM" It is unknown what the Senorita virus may do besides replicate.