Write Virus

 Virus Name:  Write 
 Aliases:     Write.474 
 V Status:    New 
 Discovered:  January, 1996 
 Symptoms:    .EXE file growth; file date/time changes; system hangs 
 Origin:      Unknown 
 Eff Length:  474 - 488 Bytes 
 Type Code:   PRaE - Parasitic Resident .EXE Infector 
 Detection Method:  IBMAV, ViruScan, NAV, NAVDX, AVTK, ChAV, 
                    IBMAV/N, NShld, NAV/N, AVTK/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Write or Write.474 virus was received in January, 1996.  Its 
       origin or point of isolation is unknown.  Write is a memory resident 
       infector of .EXE files.  System hangs frequently occur on infected 
       When the first Write infected program is executed, this virus will 
       install itself memory resident in allocated system memory, hooking 
       interrupt 21.  Total system and available free memory, as indicated 
       by the DOS CHKDSK program from DOS 5.0, will not be altered. 
       Once the Write virus is memory resident, it will infect .EXE files 
       when they are executed.  Infected programs will have a file length 
       increase of 474 to 488 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 updated to the current system date 
       and time when infection occurred.  No significate text strings are 
       visible within the viral code. 

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