Joker Virus

 Virus Name:  Joker 
 Aliases:     Jocker 
 V Status:    Extinct 
 Discovered:  December, 1989 
 Symptoms:    Messages, .EXE and .DBF growth 
 Origin:      Poland 
 Eff Length:  ??? Bytes 
 Type Code:   PNE - Parasitic Non-Resident .EXE Infector 
 Detection Method:  IBMAV, AVTK, F-Prot, Sweep, NAV, NAVDX, VAlert, 
                    ViruScan, PCScan, ChAV, 
                    NShld, Sweep/N, Innoc, AVTK/N, NAV/N, NProt, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Joker virus was isolated in Poland in December, 1989. This virus 
       is a generic .EXE file infector, and is a poor replicator (i.e., it 
       does not quickly infect other files). 
       Programs which are infected with the Joker virus will display bogus 
       error messages and comments.  These messages and comments can be 
       found in the infected files at the beginning of the viral code. 
       Here are some of the messages and comments that may be displayed: 
       "Incorrect DOS version" 
       "Invalid Volume ID Format failure" 
       "Please put a new disk into drive A:" 
       "End of input file" 
       "Divide Overflow" 
       "Water detect in Co-processor" 
       "I am hungry! Insert HAMBURGER into drive A:" 
       " Thanks." 
       "Don't beat me !!" 
       "Don't drink and drive." 
       "Another cup of cofee ?" 
       " OH, YES!" 
       "Hard Disk head has been destroyed. Can you borow me your one?" 
       "Missing light magenta ribbon in printer!" 
       "In case mistake, call GHOST BUSTERS" 
       "Insert tractor toilet paper into printer." 
       This virus may also alter .DBF files, adding messages to them. 
       The sample in the author of this listing possession does not 
       replicate on an 8088 based system.  This entry has been included 
       since the sample may have been damaged before its receipt by the 
       author.  At best, there is a serious bug in the replication portion 
       of this virus which prevents it from replicating. 

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