Big Joke Virus

 Virus Name:  Big Joke 
 V Status:    Rare 
 Discovery:   November, 1991 
 Symptoms:    .COM file growth; file date/time change; message 
 Origin:      Unknown 
 Eff Length:  1,068 Bytes 
 Type Code:   PNC - Parasitic Non-Resident .COM Infector 
 Detection Method:  ViruScan, Sweep, AVTK, F-Prot, ChAV, 
                    NAV, IBMAV, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Big Joke virus was received in November, 1991.  Its origin is 
       unknown.  Big Joke is a non-resident, direct action infector of 
       .COM files.  It will not infect COMMAND.COM. 
       When a program infected with Big Joke is executed, the virus will 
       infect one previously uninfected .COM program located in the 
       current directory.  Programs infected with Big Joke will have 
       increased in size by 1,068 bytes with the virus being located at 
       the end of the infected file.  The file's date and time in the 
       DOS disk directory will have been updated to the current system 
       date and time when infection occurred. 
       The Big Joke virus will occassionally display a message to the 
       user when an infected program is executed.  When this message is 
       displayed, it is written one line at a time to the center of the 
       display.  When the message completes, it will be repeated until 
       the system is rebooted.  The message text is: 
               "At last ...... ALIVE !!!!! 
                I guess your computer is infected by the Big Joke Virus. 
                Release 4/4-91 
                Lucky you, this is the kind version. 
                Be more careful while duplicating in the future. 
                The Big Joke Virus, killer version, will strike harder. 
                The Big Joke rules forever." 
       The above message's text strings can be found in files infected 
       with Big Joke, as well as the following two additional text 
               "????????.COM COMMAND" 
       Big joke, in its currect version, does not do anything besides 
       replicate and display its message. 

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