Scrappy Virus

 Virus Name:  Scrappy 
 Aliases:     Scrappy.416 
 V Status:    New 
 Discovered:  January, 1996 
 Symptoms:    .COM file growth; 
              decrease in available free memory 
 Origin:      Unknown 
 Eff Length:  416 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  F-Prot, AVTK, IBMAV, ChAV, NAV, NAVDX, ViruScan 2.54+, 
                    Innoc, NProt, AVTK/N, IBMAV/N, NAV/N, NShld 2.33+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Scrappy virus was received in January, 1996.  Its origin or 
       point of isolation is unknown.  Scrappy is a memory resident 
       infector of .COM files, including COMMAND.COM. 
       When the first Scrappy 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. 
       Available free memory, as indicated by the DOS CHKDSK program from 
       DOS 5.0, will have decreased by 448 bytes.  Interrupt 21 will be 
       hooked by the virus in memory. 
       Once the Scrappy virus is memory resident, it will infect .COM 
       files, including COMMAND.COM, when they are executed.  Infected 
       files will have a file length increase of 416 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.  No text 
       strings are visible within the viral code. 

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