Qpis Virus

 Virus Name:  Qpis 
 Aliases:     Qpis.2931 
 V Status:    New 
 Discovery:   January, 1996 
 Symptoms:    .COM & .EXE growth; decrease in available free memory; 
              unexpected errors on DOS DIR commands 
 Origin:      Unknown 
 Eff Length:  2,931 - 2,947 Bytes 
 Type Code:   PRhAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  F-Prot, AVTK, IBMAV, NAV, NAVDX, ChAV, 
                    ViruScan 2.54+, 
                    Innoc, AVTK/N, IBMAV/N, NAV/N, NShld 2.33+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Qpis virus was received in January, 1996.  Its origin or point 
       of isolation is unknown.  Qpis is a memory resident infector of 
       .COM and .EXE files, including COMMAND.COM.  It only infects files 
       located in the drive root directory. 
       When the first Qpis 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 4,098 bytes.  Interrupts 13 and 21 
       will be hooked by the virus in memory. 
       Once the Qpis virus is memory resident, it will infect .COM and 
       .EXE files located in the root directory, including COMMAND.COM, 
       when they are executed or opened, but not when copied.  Infected 
       .COM files will have a file length increase of 2,931 bytes while 
       .EXE files will increase in size by 2,937 to 2,947 bytes.  In both 
       cases, the virus will be 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 visible within the 
       viral code: 
       This virus will interfer with the functioning of the DOS DIR 
       command, resulting in possible errors such as "Parameter format 
       not correct" and "Too many parameters" 

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