Liberty-1172 Virus

 Virus Name:  Liberty-1172 
 Aliases:     Lib1172 
 V Status:    Rare 
 Discovered:  December, 1991 
 Symptoms:    .COM file growth; file date/time change; decrease in total 
              system and available free memory 
 Origin:      Unknown 
 Eff Length:  1,172 - 1,186 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, Sweep, AVTK, F-Prot, ChAV, 
                    IBMAV, NAV, NAVDX, VAlert, PCScan, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Liberty-1172 virus was received in December, 1991.  Its origin 
       is unknown.  Liberty-1172 is a memory resident infector of .COM 
       programs, including COMMAND.COM. 
       When the first Liberty-1172 virus infected program is executed, the 
       Liberty-1172 virus will install itself memory resident at the top 
       of system memory but below the 640K DOS boundary.  Total system 
       and available free memory, as indicated by the DOS CHKDSK program, 
       will have decreased by 1,568 bytes.  Interrupt 12's return will 
       not have been moved.  Interrupts 09 and 21 will be hooked by 
       Liberty-1172 in high system memory. 
       After Liberty-1172 has become memory resident, it will infect .COM 
       programs, including COMMAND.COM, when they are executed.  Infected 
       programs will have a file length increase of 1,172 to 1,186 bytes. 
       The virus will be located at the end of the file.  The program's 
       date and time in the DOS disk directory listing will have been 
       updated to the system date and time when infection occurred.  One 
       text string can be found within the viral code in infected files: 
       This text string will alo be found near the beginning of the file, 
       which is how Liberty-1172 marks the file as being infected. 
       It is unknown if Liberty-1172 does anything besides replicate. 

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