Trieda Virus

 Virus Name:  Trieda 
 Aliases:     Trieda.851 
 V Status:    New 
 Discovered:  January, 1996 
 Symptoms:    .EXE file growth 
 Origin:      Unknown 
 Eff Length:  851 Bytes 
 Type Code:   PNE - Parasitic Non-Resident .EXE Infector 
 Detection Method: ChAV, AVTK, IBMAV, ViruScan, NAV, NAVDX, PCScan, 
                   Innoc, AVTK/N, IBMAV/N, NShld, NAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Trieda or Trieda.851 virus was received in January, 1996.  Its 
       origin or point of isolation is unknown.  Trieda is a non-resident 
       direct action infector of .EXE files. 
       When a program infected with the Trieda virus is executed, this 
       virus will infect up to three .EXE files located in the current 
       directory, however it does not infect past the fourth .EXE file 
       located in the current directory.  Once it starts to infect the 
       fourth .EXE file in the directory, it will reinfect this file 
       over and over again. 
       Programs infected with this virus will have a file length increase 
       of 851 bytes for each copy of the virus present on the file.  The 
       virus will be 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 visible within the viral code: 
           "Trieda 4.Cv tento den roku 1994 zapasila s maturitami a 
            vyhrala !!!" 

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