Tchantches Virus


 Virus Name:  Tchantches 
 Aliases:    
 V Status:    New 
 Discovered:  April, 1993 
 Symptoms:    .COM & .EXE growth; graphic display & system hang; 
              decrease in total system & available free memory 
 Origin:      Liege, Belgium 
 Eff Length:  3,303 - 3,318 Bytes 
 Type Code:   PRsAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  AVTK, F-Prot, ViruScan, Sweep, IBMAV, NAV, 
                    NAVDX, VAlert, ChAV, 
                    NShld, AVTK/N, Sweep/N, NAV/N, IBMAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 
 General Comments: 
       The Tchantches virus was submitted in April, 1993.  It is originally 
       from Liege, Belgium, and is based on the Gotcha family of viruses. 
       Tchantches is a memory resident infector of .COM and .EXE programs, 
       including COMMAND.COM. 
 
       When the first Tchantches 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 3,648 bytes.  Interrupt 21 
       will be hooked by Tchantches in memory.  Also at this time, the 
       Tchantches virus will infect COMMAND.COM. 
 
       Once the Tchantches virus is memory resident, it will infect .COM 
       and .EXE programs when they are executed or opened for any reason. 
       Tchantches infected programs will have a file length increase of 
       3,303 to 3,318 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 Tchantches viral code, thus not visible within infected files: 
 
               "TCHANTCHES d‚mineur v1,10" 
               "Portez secours … votre disque dur" 
               "Entr‚e=Drapeau, Espace=Explorer" 
               "(C)Copyright Setaicossa EefaCm '92" 
 
       The Tchantches virus activates when the virus becomes memory 
       resident on April 1st of any year.  At this time, the virus will 
       draw a box centered on the system display.  The first two lines 
       of text above will be at the top of the box, and the last two lines 
       of text at the bottom.  The system will then be hung. 
 
       See:   Gotcha

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