Thimble Virus

 Virus Name:  Thimble 
 V Status:    Rare 
 Discovered:  February, 1992 
 Symptoms:    .COM file growth; TSR; file date/time change 
 Origin:      Unknown 
 Eff Length:  1,024 - 2,046 Bytes 
 Type Code:   PRsCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, F-Prot, Sweep, NAV, AVTK, PCScan, 
                    IBMAV, NAVDX, VAlert, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Thimble virus was submitted in February, 1992.  Its origin, or 
       point of isolation, is unknown.  Thimble is a memory resident 
       infector of .COM programs, including COMMAND.COM. 
       When the first Thimble infected .COM program is executed, the 
       Thimble virus will install itself memory resident as a low system 
       memory TSR of 4,416 bytes.  Interrupts 21 and CC will be hooked by 
       the virus in memory. 
       After the Thimble virus has become memory resident, it will infect 
       .COM programs when they are executed.  If COMMAND.COM is executed, 
       it will become infected. 
       Programs infected with the Thimble virus will normally increase 
       in size by 1,024 bytes.  The exception is that programs which were 
       originally smaller than 1,024 bytes in length will become 2,048 
       bytes in length.  The virus will be located at the beginning of the 
       program.  The file's date and time in the DOS disk directory listing 
       will have been updated to the current system date and time when 
       infection occurred. 
       The following text strings can be found in all Thimble infected 
               "Greetings to Cracker Jack..." 
               "Loving thoughts to Shirley" 
               "Marty McFly lives somewhere in time." 
               "Kill Eddie. Kill Diana. Kill Fredo." 
       It is unknown if Thimble does anything besides replicate. 

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