Karlik Virus

 Virus Name:  Karlik 
 V Status:    Rare 
 Discovered:  August, 1993 
 Symptoms:    .COM & .EXE growth; 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  1,666 Bytes 
 Type Code:   PRhAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  F-Prot, IBMAV, Sweep, ViruScan, NAV, AVTK, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, NAV/N, NProt, AVTK/N, IBMAV/N, Innoc, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Karlik virus was submitted in August, 1993.  Its origin or point 
       of isolation is unknown.  Karlik is a memory resident infector of 
       .COM and .EXE programs, including COMMAND.COM. 
       When the first Karlik 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.  Total 
       system and available free memory, as indicated by the DOS CHKDSK 
       program, will have decreased by 1,808 bytes.  Interrupts 08 and 21 
       will be hooked by Karlik in memory. 
       Once memory resident, the Karlik virus will infect .COM files, and 
       some .EXE files, when they are executed.  Infected programs will have 
       a file length increase of 1,666 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.  No text strings are visible 
       within the viral code in infected programs. 
       It is unknown what Karlik does besides replicate. 

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