Rosario Virus

 Virus Name:  Rosario 
 Aliases:     Rosario.1221 
 V Status:    New 
 Discovery:   May, 1996 
 Symptoms:    .COM file growth; decrease in available free memory 
 Origin:      Argentina 
 Eff Length:  1,221 Bytes 
 Type Code:   PRhC - Parasitic Resident .COM Infector 
 Detection Method: ChAV, F-Prot, AVTK, IBMAV, ViruScan, NAV, NAVDX, PCScan, 
                   Innoc, AVTK/N, IBMAV/N, NShld, NAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Rosario or Rosario.1221 virus was received in May, 1996, and 
       appears to be from Argentina.  It is a fast infector of .COM 
       files, but not COMMAND.COM. 
       When the first Rosario 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 4,112 bytes.  Interrupt 21 
       will be hooked by the virus in memory. 
       Once the Rosario virus is memory resident, it will infect .COM 
       files other than COMMAND.COM when they are executed or opened, 
       but not when copied.  Infected files will have a file length 
       increase of 1,221 bytes with the virus being located at the 
       beginning 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: 
           "Diego)es.NOB MOC.DNAMMOCE:\NOB_93.JPG" 
           "Felicitciones su maquina esta infectada por el virus 
            LEPROSO creado por" 
           "J.P.G., hoy es mi cumpleanos y lo voy a festejar 
            formateando su rigido!!!" 
           "Bye...(Vamos Null que con Diego somos campeones)" 
           "CopyRight (C) 1993 hasta 2000, J.P.G., Rosario, Argentina" 
       This virus, under some circumstance, may format the system hard 

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