Weak Virus

 Virus Name:  Weak 
 Aliases:     Vulner 
 V Status:    Rare 
 Discovered:  December, 1992 
 Symptoms:    .COM file growth; system hangs 
 Origin:      Unknown 
 Eff Length:  1,253 Bytes 
 Type Code:   PRfCK - Parasitic Resident .COM Infector 
 Detection Method:  Sweep, AVTK, F-Prot, ViruScan, NAV, NAVDX, 
                    IBMAV, VAlert, ChAV, 
                    Sweep/N, NShld, AVTK/N, NAV/N, IBMAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Weak, or Vulner, virus was submitted in December, 1992.  Its 
       origin or point of isolation is unknown.  Weak is a memory resident 
       infector of .COM programs, including COMMAND.COM. 
       When the first Weak infected program is executed, the Weak virus 
       will become memory resident in available free memory, hooking 
       interrupt 21.  Total system and available free memory, as indicated 
       by the DOS CHKDSK program, will not be altered. 
       Once the Weak virus is memory resident, it will infect .COM 
       programs, including COMMAND.COM, when they are copied or opened, 
       providing the program is located in a subdirectory.  Programs located 
       in the root directory will not become infected.  Programs infected 
       with the Weak virus will have a file length increase of 1,253 bytes 
       with the virus being located at the beginning of the file.  The 
       program's date and time in the DOS disk directory listing will not 
       be altered.  The following text string is encrypted within the viral 
               "Et tu vulneratus es sicut et nos, 
                nostri similis effectus es..." 
       System hangs frequently occur on infected systems. 

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