Linda Virus

 Virus Name:  Linda 
 Aliases:     Linda.517 
 V Status:    New 
 Discovered:  January, 1996 
 Symptoms:    .COM & .EXE file corruption; file date/time seconds = "58"; 
              programs fail to function, returning user to DOS prompt; 
              system hangs; decrease in available free memory 
 Origin:      Unknown 
 Eff Length:  517 Bytes Overwriting 
 Type Code:   OhA - Overwriting Resident .COM & .EXE Infector 
 Detection Method: NAV, NAVDX, IBMAV, AVTK, ViruScan, F-Prot, ChAV, 
                   NAV/N, IBMAV/N, AVTK/N, NShld, Innoc 4.0+ 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Linda or Linda.517 virus was received in January, 1996.  Its 
       origin or point of isolation is unknown.  Linda is a memory 
       resident overwriting virus which infects .COM and .EXE files, but 
       not COMMAND.COM. 
       When the first Linda 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 will have decreased by approximately 768 bytes, 
       and interrupt 21 will be hooked by the virus in memory. 
       Once the Linda virus is memory resident, it will infect .COM and 
       .EXE files when they are executed.  Infected files will have the 
       first 517 bytes overwritten by the Linda viral code.  The file's 
       date and time in the DOS disk directory listing will not appear 
       to be altered, though the seconds field will have been set to "58". 
       The following text string is visible within the viral code in all 
       infected files: 
           "FUCKING TO L.I.N.D.A." 
       Infected programs will not function properly, returning the user 
       to the system prompt when the user attempts to execute them.  System 
       hangs may also occur when infected programs are executed. 

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