Julia-1000 Virus

 Virus Name:  Julia-1000 
 V Status:    Rare 
 Discovered:  November, 1993 
 Symptoms:    .COM & .EXE growth; system hangs; 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  1,000 Bytes 
 Type Code:   PRhAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  F-Prot, ViruScan, Sweep, AVTK, IBMAV, 
                    NAVDX, VAlert, NAV, PCScan, ChAV, 
                    Sweep/N, NShld, AVTK/N, NProt, Innoc, IBMAV/N, NAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Julia-1000 virus was received in November, 1993.  Its origin or 
       point of isolation is unknown.  Julia-1000 is a memory resident 
       infector of .COM and .EXE programs, including COMMAND.COM. 
       When the first Julia-1000 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 2,080 bytes.  Interrupt 21 will be 
       hooked by the virus in memory. 
       Once Julia-1000 is memory resident, it will infect .COM and .EXE 
       programs when they are executed.  Infected programs will have a file 
       length increase of 1,000 bytes.  In the case of .COM programs, the 
       virus will be located at the beginning of the file, while for .EXE 
       programs, the virus will be 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 Julia-1000 viral 
               "Julia L." 
               "Today is May Day ! Ver 3" 
       System hangs may occur when Julia-1000 infected programs are executed. 
       Known variant(s) of Julia-1000 are: 
       Julia-1027: Received in November, 1993, Julia-1027 is a 1,027 
                   byte variant of the Julia-1000 virus described above. 
                   Origin:  Unknown  November, 1993. 

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