1024 Print Screen Virus

 Virus Name:  1024 Print Screen 
 Aliases:     1024PSCR 
 V Status:    Rare 
 Discovery:   May, 1991 
 Symptoms:    .COM file growth; file date/time changes; Print Screen key 
              failure; decrease in available free memory 
 Origin:      Unknown 
 Eff Length:  1,024 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, F-Prot, Sweep, AVTK, NAV, 
                    IBMAV, NAVDX, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The 1024 Print Screen virus was received in May, 1991.  Its origin, 
       and its point of isolation, are unknown.  This virus is a memory 
       resident infector of .COM files. 
       The first time a program infected with 1024 Print Screen is 
       executed, the virus will install itself memory resident at the top 
       of system memory but below the 640K DOS boundary.  Available free 
       memory, as measured by the DOS CHKDSK program, will decrease by 
       2,048 bytes.  Total system memory will not change.  Interrupts 05 
       and 21 will be hooked by the virus.  COMMAND.COM will also be 
       infected at this time. 
       After 1024 Print Screen is memory resident, it will infect .COM 
       programs over 1K in size when they are executed or opened for any 
       reason.  Infected .COM programs will increase in size by 1,024 
       bytes with the virus being located at the beginning of the file. 
       Programs infected with 1024 Print Screen will also have their file 
       date and time in the disk directory altered to the system date and 
       time of infection. 
       When 1024 Print Screen is memory resident, it will interfer with 
       the functioning of the Print Screen key.  Pressing the Print 
       Screen key will result in a display of the system's CMOS 
       configuration instead of printing the contents of the display. 

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