Unhandled Virus

 Virus Name:  Unhandled 
 V Status:    New 
 Discovered:  February, 1995 
 Symptoms:    .COM file growth; file date/time changes; 
              message & system reboot 
 Origin:      Unknown 
 Eff Length:  424 Bytes 
 Type Code:   PRaCK - Parasitic Resident .COM Infector 
 Detection Method:  F-Prot, IBMAV, AVTK, Sweep, NAVDX, VAlert, NAV, 
                    ViruScan, ChAV, 
                    NProt, IBMAV/N, AVTK/N, Sweep/N, NAV/N, NShld, Innoc 4.0+ 
 Removal Instructions:  Delete infected Files 
 General Comments: 
       The Unhandled virus was received in February, 1995.  Its origin or 
       point of isolation is unknown.  Unhandled is a memory resident 
       infector of .COM files, including COMMAND.COM. 
       When the first Unhandled infected program is executed, this virus 
       will install itself memory resident in allocated system memory, 
       hooking interrupt 21.  Total system and available free memory, as 
       indicated by the DOS CHKDSK program, will not be altered. 
       Once the Unhandled virus is memory resident, it will infect .COM 
       files when they are executed or opened.  Infected .COM files will 
       have a file length increase of 424 bytes with the virus being 
       located at the end of the file.  The program's date and time will 
       have been updated to the current system date and time when infection 
       occurred.  The following text string can be found at the end of all 
       infected files: 
       The Unhandled virus will occassionally clear the system display 
       and display a message which starts with the phrase: 
               "Unhandled ..." 
       A system reboot will then occur. 

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