572 Virus

 Virus Name:  572 
 V Status:    Rare 
 Discovery:   April, 1992 
 Symptoms:    .EXE file growth; file date/time changes; decrease in total 
              system and available free memory 
 Origin:      Unknown 
 Eff Length:  572 Bytes 
 Type Code:   PRhE - Parasitic Resident .EXE Infector 
 Detection Method:  ViruScan, AVTK, F-Prot, Sweep, IBMAV, 
                    NAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, LProt, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 572 virus was received in April, 1992.  Its origin or point of 
       isolation is unknown.  This virus is a memory resident infector of 
       .EXE programs. 
       The first time a program infected with the 572 virus is executed, 
       this virus will install itself memory resident at the top of system 
       memory but below the 640K DOS boundary.  Total system and available 
       free memory, as indicated by the DOS CHKDSK program, will have 
       decreased by 1,024 bytes.  Interrupts 21 and 24 will be hooked by 
       the 572 virus in memory. 
       Once the 572 virus is memory resident, it will infect .EXE programs 
       as they are executed.  Infected programs will have a file length 
       increase of 572 bytes with the virus being located at the end of 
       the infected file.  The program's date and time in the DOS disk 
       directory will have been updated to the system date and time when 
       infection occurred. 
       It is unknown if 572 does anything besides replicate. 
       Known variant(s) of 572 are: 
       572-COD: A minor variant of the 572 virus, this variant has three 
                bytes which differ. 
                Origin:  Unknown  May, 1992. 

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