Beeper Virus

 Virus Name:  Beeper 
 Aliases:     Russian Mirror 
 V Status:    Rare 
 Discovery:   1991 
 Symptoms:    .COM file growth; file date/time changes; beeps on system 
              speaker; hard disk corruption 
 Origin:      USSR 
 Eff Length:  482 Bytes 
 Type Code:   PRCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, AVTK, Sweep, IBMAV, NAV, 
                    F-Prot, NAVDX, VAlert, PCScan, ChAV, 
                    LProt, NShld, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Beeper, or Russian Mirror, virus was first isolated in the USSR 
       sometime in 1991.  It was not added to VSUM until November, 1992 due 
       to previous samples not replicating.  Beeper is a memory resident 
       infector of .COM programs, including COMMAND.COM.  It can also 
       corrupt the system hard disk on infected systems. 
       The first time a program infected with the Beeper virus is executed, 
       the Beeper virus will install itself memory resident in low available 
       free memory, hooking interrupt 21.  Total system and available free 
       memory, as indicated by the DOS CHKDSK program, will not be altered. 
       Once the Beeper virus is memory resident, it will infect .COM 
       programs when they are executed twice in a row.  Infected programs 
       will have a file length increase of 482 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 have been altered to the current 
       system date and time when infection occurred.  No text strings are 
       visible within the viral code in infected programs. 
       Systems infected with the Beeper virus may experience the hard 
       disk becoming corrupted, resulting in an "Invalid drive 
       specification" message when the user attempts to access it.  This 
       corruption occurs when the virus will occassionally overwrite the 
       system hard disk's master boot sector.  Users of infected systems 
       may also notice that a "beep" will be emitted from the system 
       speaker when infected programs are executed. 

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