Fly 1.1 Virus

 Virus Name:  Fly 1.1 
 V Status:    Rare 
 Discovered:  April, 1993 
 Isolated:    Unknown 
 Symptoms:    .COM & .EXE growth; write protect errors on diskettes; 
              decrease in total system & available free memory 
 Origin:      Unknown 
 Eff Length:  1,771 - 1,786 Bytes 
 Type Code:   PRhAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  F-Prot, Sweep, NAV, IBMAV, AVTK, ViruScan, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    NShld, Sweep/N, NAV/N, AVTK/N, IBMAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Fly 1.1 virus was submitted in April, 1993.  Its origin or 
       point of isolation is unknown.  Fly 1.1 is a memory resident infector 
       of .COM and .EXE programs, including COMMAND.COM. 
       When the first Fly 1.1 infected program is executed, the Fly 1.1 
       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 3,200 bytes.  Interrupt 
       21 will be hooked by Fly 1.1 in memory. 
       Once the Fly 1.1 virus is memory resident, it will infect .COM and 
       .EXE programs, including COMMAND.COM, when they are executed. 
       Infected programs will have a file length increase of 1,771 to 
       1,786 bytes with the virus being 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 encrypted within the 
       Fly 1.1 viral code: 
               "Fly 1.1" 
       Systems infected with the Fly 1.1 virus will experience write 
       protect errors when the user attempts to execute programs from 
       write protected diskettes when the virus is memory resident. 

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