AIW Virus


 Virus Name:  AIW 
 Aliases:    
 V Status:    Rare 
 Discovery:   July, 1994 
 Symptoms:    .COM file growth; file date/time changes 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  572 Bytes 
 Type Code:   PRtC - Parasitic Resident .COM Infector 
 Detection Method:  F-Prot, AVTK, IBMAV, ViruScan, Sweep, 
                    NAVDX, VAlert, NAV, PCScan, 
                    Sweep/N, AVTK/N, NProt, IBMAV/N, NShld, NAV/N 
 Removal Instructions:  Delete infected files 
 
 General Comments: 
       The AIW virus was received in July, 1994.  Its origin or point of 
       isolation is unknown.  AIW is a memory resident infector of .COM 
       files, but not COMMAND.COM. 
 
       When the first AIW infected program is executed, this virus will 
       install itself 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 2,048 bytes.  Interrupt 21 will be hooked by 
       the virus in memory. 
 
       Once memory resident, the AIW virus will infect .COM programs when 
       they are executed.  Infected programs will have a file length increase 
       of 572 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.  The following text string can be found near the beginning 
       of all AIW infected programs: 
 
               "AIW2°JB" 

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