Positron Virus

 Virus Name:  Positron 
 V Status:    New 
 Discovered:  September, 1994 
 Symptoms:    .COM file growth; 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  512 Bytes 
 Type Code:   PRhC - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, IBMAV, F-Prot, NAV, NAVDX, AVTK 7.68+, 
                    NShld, IBMAV/N, NAV/N, AVTK/N 7.68+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Positron virus was received in September, 1994.  Its origin or 
       point of isolation is unknown.  Positron is a memory resident 
       infector of .COM files, but not COMMAND.COM. 
       When the first Positron 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 560 bytes.  Interrupt 21 will be hooked by the 
       virus in memory. 
       Once the Positron virus is memory resident, it will infect .COM 
       programs when they are executed.  Infected programs will have a file 
       length increase of 512 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 strings are visible 
       within the viral code in all Positron infected programs: 
               "(c) 1994 Evil Avatar" 
       The Positron virus doesn't do anything besides replicate. 

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