Spectral Virus

 Virus Name:  Spectral 
 Aliases:     Spectral.907 
 V Status:    New 
 Discovered:  December, 1996 
 Symptoms:    .COM file growth; decrease in available free memory 
 Origin:      Unknown 
 Eff Length:  907 Bytes 
 Type Code:   PRhCK - Parasitic Resident .COM Infector 
 Detection Method:  NAV, NAVDX, AVTK, ViruScan, PCScan, 
                    NAV/N, AVTK/N, NShld 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Spectral or Spectral.907 virus was received in December, 1996. 
       Its origin or point of isolation is unknown.  The virus is a memory 
       resident fast infector of .COM files, including COMMAND.COM. 
       When the first Spectral 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 1,904 bytes.  Interrupt 21 will be hooked by the 
       virus in memory. 
       Once the Spectral virus is memory resident, it will infect .COM files 
       when they are executed or opened, but not when copied.  Infected 
       programs will have a file length increase of 907 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.  The following 
       text strings are encrypted within the viral code: 
           "The Screaching Weasel is installed." 
           "By Spectral Shadow" 
       It is unknown what this virus may do besides replicate. 

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