Puke-393 Virus

 Virus Name:  Puke-393 
 Aliases:     Puke 
 V Status:    Rare 
 Discovery:   November, 1992 
 Symptoms:    .COM & .EXE growth 
 Origin:      Australia 
 Eff Length:  393 Bytes 
 Type Code:   PRAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  ViruScan, F-Prot, Sweep, NAV, NAVDX, AVTK, IBMAV, 
                    VAlert, ChAV, 
                    NShld, Sweep/N, NAV/N, AVTK/N, NProt, IBMAV/N, Innoc 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Puke-393 virus was received from Australia in November, 1992. 
       Puke-393 is a memory resident infector of .COM and .EXE programs, 
       including COMMAND.COM. 
       The first time a program infected with the Puke-393 virus is 
       executed, the Puke-393 virus will install itself memory resident in 
       a "hole" in low system memory, hooking interrupt 21.  Total system 
       and available free memory, as indicated by the DOS CHKDSK program, 
       will not be altered. 
       Once memory resident, the Puke-393 virus will infect .COM and .EXE 
       programs, including COMMAND.COM, when they are executed.  Infected 
       programs will have a file length increase of 393 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.  One 
       text string is visible within the viral code: 
       It is unknown if Puke-393 does anything besides replicate. 

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