Skew-469 Virus

 Virus Name:  Skew-469 
 Aliases:     Skew 
 V Status:    Rare 
 Discovered:  February, 1993 
 Symptoms:    .EXE file growth; file date/time changes 
 Origin:      USSR 
 Eff Length:  469 - 485 Bytes 
 Type Code:   PRxE - Parasitic Resident .EXE Infector 
 Detection Method:  Sweep, AVTK, F-Prot, IBMAV, ViruScan, 
                    NAV, NAVDX, VAlert, PCScan, ChAV, 
                    Sweep/N, NShld, AVTK/N, NAV/N, NProt, IBMAV/N, Innoc, 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Skew-469, or Skew, virus was submitted in February, 1993, and 
       is originally from the USSR.  Skew-469 is a memory resident infector 
       of .EXE programs.  It is a fast infector, quickly spreading on 
       infected systems. 
       When the first Skew-469 virus infected program is executed, this 
       virus will install itself memory resident in a "hole" in allocated 
       low system memory, hooking interrupts 1C and 21.  Total system and 
       available free memory, as indicated by the DOS CHKDSK program, will 
       not be altered. 
       Once the Skew-469 virus is memory resident, it will infect .EXE 
       programs when they are executed or opened for any reason.  Infected 
       programs will have a file length increase of 469 to 485 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 have been updated to 
       the current system date and time when infection occurred.  No 
       text strings are visible within the viral code in infected programs. 
       It is unknown if Skew-469 does anything besides replicate. 

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