Ozzy Virus

 Virus Name:  Ozzy 
 Aliases:     Ozzy.546 
 V Status:    New 
 Discovered:  January, 1996 
 Symptoms:    .COM & .EXE file growth; 
              decrease in available free memory 
 Origin:      Unknown 
 Eff Length:  546 - 560 Bytes 
 Type Code:   PRhAK - Parasitic Resident .COM & .EXE Infector 
 Detection Method:  AVTK, IBMAV, ViruScan, NAV, NAVDX, ChAV, 
                    NAV/N, AVTK/N, NShld 2.33+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Ozzy virus was received in January, 1996.  Its origin or point 
       of isolation is unknown.  Ozzy is a memory resident infector of 
       .COM and .EXE files, including COMMAND.COM. 
       When the first Ozzy 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 624 bytes.  Interrupts 21 and 22 
       will be hooked by the virus in memory. 
       Once the Ozzy virus is memory resident, it will infect .COM and 
       .EXE files when they are executed.  Infected .COM files will 
       increase in size by 546 bytes while .EXE files increase in size 
       by 546 to 560 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 string 
       is visible within the viral code: 
           "Ozzy Osbourne virus por El Flaco" 

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