Cavaco Virus

 Virus Name:  Cavaco 
 Aliases:     Cavaco.1470 
 V Status:    New 
 Discovery:   January, 1996 
 Symptoms:    .COM & .EXE growth; 
              decrease in available free memory 
 Origin:      Portugal 
 Eff Length:  1,470 Bytes 
 Type Code:   PRhAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method: NAV, NAVDX, IBMAV, ViruScan, VAlert, AVTK, F-Prot, 
                   ChAV, PCScan, 
                   AVTK/N, NAV/N, IBMAV/N, NShld, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Cavaco virus was received in January, 1996.  It appears to be 
       from Portugal.  Cavaco is a memory resident infector of .COM and 
       .EXE files, including COMMAND.COM. 
       When the first Cavaco 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 1,760 bytes.  Interrupt 21 will be hooked by 
       the virus in memory.  Also at this time, the virus will infect the 
       copy of COMMAND.COM located in the C: drive root directory if it 
       was not previously infected by the virus. 
       Once the Cavaco virus is memory resident, it will infect .COM and 
       .EXE files when they are executed.  Infected programs will have a 
       file length increase of 1,470 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: 
           "Do you like this Screen Saver ?" 
           "Cavaco - A virus created by The Portuguese Government" 
       It is unknown that the Cavaco virus may do besides replicate. 

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