Quartz Virus

 Virus Name:  Quartz 
 V Status:    New 
 Discovery:   July, 1995 
 Symptoms:    .COM & .EXE growth; decrease in available free memory 
 Origin:      Unknown 
 Eff Length:  1,420 - 1,426 Bytes 
 Type Code:   PRhAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method: F-Prot, AVTK, VAlert, ViruScan, Sweep, IBMAV, 
                   PCScan, NAV, NAVDX, PCScan,  ChAV, 
                   NShld, Sweep/N, IBMAV/N, AVTK/N, LProt, NAV/N, Innoc 4.0+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Quartz virus was received in July, 1995.  Its origin or point 
       of isolation is unknown.  Quartz is a memory resident infector of 
       .COM and .EXE files, including COMMAND.COM. 
       When the first Quartz 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. 
       Available free memory, as indicated by the DOS CHKDSK program from 
       DOS 5.0, will have decreased by 1,696 bytes.  Interrupts 1C and 21 
       will be hooked by the virus. 
       Once the Quartz virus is memory resident, it will infect .COM and 
       .EXE files when they are executed.  Infected files will have a 
       file length increase of 1,420 to 1,426 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.  No text strings 
       are visible within the viral code. 
       It is unknown what the Quartz virus may do besides replicate. 

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