Today Virus

 Virus Name:  Today 
 V Status:    Viron 
 Discovery:   June, 1993 
 Symptoms:    .COM file corruption; program execution failure; boot failure; 
              file date/time changes 
 Origin:      Unknown 
 Eff Length:  177 Bytes Overwriting 
 Type Code:   ONCK - Overwriting Non-Resident .COM Infector 
 Detection Method:  F-Prot, ViruScan, Sweep, IBMAV, AVTK, NAV, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, NProt, AVTK/N, IBMAV/N, Innoc, NAV/N, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Today virus was submitted in June, 1993.  Its origin or point of 
       isolation is unknown.  Today is a non-resident, overwriting virus 
       which infects .COM programs, including COMMAND.COM.  It permanently 
       corrupts the programs it infects. 
       When a program infected with the Today virus is executed, the Today 
       virus will infect one .COM program located in the current directory. 
       The Today virus overwrites the first 177 bytes of the host file, so 
       unless the program was originally smaller than 177 bytes, the file's 
       length will not be altered.  Programs which were originally smaller 
       than 177 bytes will become 177 bytes when infected by Today.  The 
       program'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 string is visible within the viral 
       code in all Today infected programs: 
               "*.COM Today is Good Thursday, nothing can go wrong!" 

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