Finnish-709 Virus


 Virus Name:  Finnish-709 
 Aliases:     709, Swedish-709 
 V Status:    Rare 
 Discovered:  September, 1991 
 Symptoms:    .COM file growth; decrease in total system and available free 
              memory 
 Origin:      Finland 
 Eff Length:  709 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, AVTK, Sweep, F-Prot, ChAV, 
                    NAV, IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, Sweep/N, Innoc, NProt, AVTK/N, NAV/N, IBMAV/N, 
                    LProt 
 Removal Instructions:  Delete infected files 
 
 General Comments: 
       The Finnish-709 virus was submitted in September, 1991, by 
       Mikael Larsson of Virus Help Centre, Sweden.  It is originally from 
       Finland.  Finnish-709 is a memory resident infector of .COM files, 
       including COMMAND.COM. 
 
       The first time a program infected with Finnish-709 is executed, 
       this virus will become memory resident at the top of system 
       memory but below the 640K DOS boundary.  Total system and available 
       free memory, as indicated by the DOS CHKDSK program, will have 
       decreased by 2,560 bytes.  Interrupt 12's return will not have been 
       moved.  Interrupts 1C and 21 will be hooked by the virus in memory. 
 
       Once memory resident, Finnish-709 will infect .COM programs, 
       including COMMAND.COM, when they are opened or executed.  Infected 
       .COM programs increase in size by 709 bytes.  The virus will be 
       located at the end of infected files.  There will be no change in 
       the file's date and time in the DOS disk directory. 
 
       Finnish-709 doesn't do anything besides replicate. 
 
       Known variant(s) of Finnish-709 are: 
       Finnish-357: Based on the Finnish-709 virus described above, 
                    this variant is a re-written, smaller version.  Its 
                    size in memory is 2,048 bytes, hooking interrupt 21. 
                    It infects .COM programs, including COMMAND.COM, 
                    when they are executed.  Infected programs will have 
                    a file length increase of 357 bytes with the virus 
                    being located at the end of the file.  The file's 
                    date and time in the DOS disk directory listing will 
                    have been updated to the current system date and time. 
                    Like the original, it doesn't do anything besides 
                    replicate. 
                    Origin:  Finland  November, 1992.

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