439 Virus

 Virus Name:  439 
 Aliases:     Beech 
 V Status:    Rare 
 Discovery:   August, 1992 
 Symptoms:    .COM file growth; decrease in total system & available free 
 Origin:      Poland 
 Eff Length:  439 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  F-Prot, Sweep, ViruScan, IBMAV, AVTK, NAV, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, Innoc, NProt, AVTK/N, LProt, NAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 439 virus was received in August, 1992.  It is originally from 
       Poland.  439 is a memory resident infector of .COM programs, 
       including COMMAND.COM. 
       The first time a program infected with the 439 virus is executed, 
       the 439 virus will install itself 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 2,064 bytes.  Interrupt 21 will be hooked 
       by the virus in memory. 
       Once the 439 virus is memory resident, it will infect .COM programs, 
       including COMMAND.COM, when they are executed or opened.  Infected 
       programs will have a file length increase of 439 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 439 virus doesn't appear to do anything besides replicate. 
       Known variant(s) of 439 are: 
       439-B: Functionally equivalent to the original virus, 439-B is 
              a minor variant.  A couple bytes differ from the original. 
              Origin: Poland  September, 1992. 

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