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: 
       It is unknown what this virus may do besides replicate. 

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