Madismo Virus

 Virus Name:  Madismo 
 V Status:    Viron 
 Discovered:  September, 1992 
 Symptoms:    .EXE programs overwritten; file date/time changes; message 
 Origin:      Unknown 
 Eff Length:  6,007 Bytes 
 Type Code:   ONE - Overwriting Non-Resident .EXE Infector 
 Detection Method:  ViruScan, AVTK, F-Prot, Sweep, NAV, NAVDX, VAlert, 
                    IBMAV, ChAV, 
                    NShld, AVTK/N, Sweep/N, NAV/N, IBMAV/N, Innoc 4.0+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Madismo virus was received in September, 1992.  Its origin or 
       point of isolation is unknown.  Madismo is a non-resident direct 
       action overwriting virus which infects .EXE programs. 
       When a program infected with the Madismo virus is executed, this 
       virus will access both the C: drive and the current drive, then 
       infect all .EXE programs located in the current directory which 
       are larger than 6,000 bytes in size.  Once the virus completes 
       infecting programs, it will display the following message and 
       return the user to the DOS prompt: 
               "Madismo Strikes Again!" 
       Infected programs will have the first 6,007 bytes overwritten by 
       the Madismo virus code.  The file's date and time in the DOS disk 
       directory listing will have been updated to the system date and 
       time when infection occurred.  The following text strings are 
       encrypted within the viral code: 
               "MADISMO *.EXE>MADISMO.TXT" 
               "Sector not found reading drive" 
               "Abort, Retry, Ignore, Fail?" 
               "Error in EXE file" 
               "Madismo Strikes Again!" 
               "No matching files found." 
       Programs infected with the Madismo virus are permanently corrupted 
       since the virus does not store the 6,007 bytes it overwrites. 
       They should be replaced with uninfected copies. 

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