Big-2000 Virus

 Virus Name:  Big-2000 
 Aliases:     V-1391 
 V Status:    Rare 
 Discovery:   March, 1993 
 Symptoms:    .EXE file growth; file date/time change; TSR 
 Origin:      Unknown 
 Eff Length:  2,000 Bytes 
 Type Code:   PRsE - Parasitic Resident .EXE Infector 
 Detection Method:  Sweep, AVTK, ViruScan, F-Prot, NAV, NAVDX, VAlert, 
                    Sweep/N, NShld, AVTK/N, NAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Big-2000, or V-1391, virus was submitted in March, 1993.  Its 
       origin or point of isolation is unknown.  Big-2000 is a memory 
       resident infector of large .EXE files. 
       When the first Big-2000 infected program is executed, the Big-2000 
       virus will become memory resident as a low system memory TSR of 
       2,848 bytes, hooking interrupts 01 and 18. 
       Once the Big-2000 virus is memory resident, it will infect .EXE 
       files larger than approximately 60K in size, when they are executed. 
       Infected programs will have a file length increase of 2,000 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 text strings are visible within the viral code in Big-2000 
       infected programs. 
       It is unknown what Big-2000 does besides replicate. 

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