Max.347 Virus

 Virus Name:  Max.347 
 V Status:    Rare 
 Discovered:  April, 1994 
 Symptoms:    .COM file growth; Master Boot Record Altered; 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  347 Bytes 
 Type Code:   PRtXCK - Parasitic Resident .COM & Master Boot Sector Infector 
 Detection Method:  ViruScan, F-Prot, AVTK, Sweep, IBMAV, 
                    NAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, AVTK/N, IBMAV/N, NAV/N, Innoc 4.0+ 
 Removal Instructions:  Delete infected files & F-Disk /MBR on DOS 5.0+ 
 General Comments: 
       The Max.347 virus was submitted in April, 1994.  Its origin or 
       point of isolation is unknown.  Max.347 is a memory resident, 
       multi-partite virus which infects the system hard disk master boot 
       sector (partition table sector) and .COM files, including COMMAND.COM. 
       When the first Max.347 infected program is executed, this virus will 
       infect the system hard disk master boot sector, moving the original 
       master boot sector to Side 0, Cylinder 0, Sector 2.  The virus does 
       not become memory resident at this time.  Memory residence only 
       occurs when the system is booted from the infected hard disk. 
       Max.347 becomes memory resident at the top of system memory, but below 
       the 640K DOS boundary, moving interrupt 12's return.  Total system 
       and available free memory, as indicated by the DOS CHKDSK program, 
       will have decreased by 1,024 bytes.  Interrupt 21 will be hooked by 
       the virus in memory. 
       Once Max.347 is memory resident, it will infect .COM programs when 
       they are executed.  Infected programs will have a file length increase 
       of 347 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 string is visible within the 
       viral code: 

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