Digger Virus

 Virus Name:  Digger 
 V Status:    Rare 
 Discovered:  October, 1992 
 Symptoms:    .COM file growth; .EXE file corruption; unexpected system 
 Origin:      USSR 
 Eff Length:  1,475 Bytes 
 Type Code:   PNCK - Parasitic Non-Resident .COM Infector 
 Detection Method:  AVTK, Sweep, IBMAV, F-Prot, ViruScan, 
                    NAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, Innoc, NProt, AVTK/N, LProt, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Digger virus was received in October, 1992.  It is originally 
       from the USSR.  Digger is a non-resident, direct action infector of 
       .COM programs, including COMMAND.COM.  It will also corrupt .EXE 
       When a program infected with the Digger virus is executed, this 
       virus will infect one program located on the C: drive.  It starts 
       infecting programs in the C: drive root directory, and will 
       slow work its way down the directory structure.  .COM programs 
       infected by the Digger virus will have a file length increase of 
       1,475 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.  The following text string can be found within the 
       viral code in all infected programs: 
               "C) DIGGER" 
       The Digger virus will corrupt .EXE programs which it encounters when 
       it is searching for a .COM program to infect.  These corrupted 
       programs will be completely overwritten with other code, which 
       appears to be from system memory. 
       It is unknown what Digger may do besides replicate and corrupt 
       .EXE programs. 

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