Mercenary Virus

 Virus Name:  Mercenary 
 V Status:    Rare 
 Discovered:  September, 1993 
 Symptoms:    .COM file growth; 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  854 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, IBMAV, Sweep, NAV, AVTK, F-Prot, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    AVTK/N, NShld, Sweep/N, NAV/N, NProt, AVTK/N, IBMAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Mercenary virus was submitted in September, 1993.  Its origin 
       or point of isolation is unknown.  Mercenary is a memory resident 
       infector of .COM programs, including COMMAND.COM. 
       When the first Mercenary 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. 
       Total system and available free memory, as indicated by the DOS CHKDSK 
       program, will have decreased by 7,040 bytes.  Interrupt 21 will be 
       hooked by Mercenary in memory. 
       Once the Mercenary virus is memory resident, it will infect .COM 
       programs, including COMMAND.COM, when they are executed.  Infected 
       files will have a file length increase of 854 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 strings are encrypted within the Mercenary viral code, and are 
       not visible within infected programs: 
               "Mercenry Virii V.1 written by Lupus Yonderboy" 
               "Greets to all of Phalcon / Skism (who don't know i exist)" 
               "Welcome to the wonderful world of VIRII" 
               "You are now in possession of the Mercenry Virii." 
               "By Lupus Yonderboy" 
               "Chaos Mr. Who." 
               "That is our mode and modus" 
               "Hail to the Succubi" 

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