Ada Virus

 Virus Name:  Ada 
 V Status:    Rare 
 Discovery:   October, 1991 
 Symptoms:    .COM file growth; slow clicking from system speaker; 
              decrease in available free memory 
 Origin:      Argentina 
 Eff Length:  2,600 Bytes 
 Type Code:   PRsCK - Parasitic Resident .COM Infector 
 Detection Method:  ViruScan, AVTK, Sweep, F-Prot, NAV, IBMAV, 
                    NAVDX, VAlert, PCScan, ChAV, 
                    NShld, LProt, Sweep/N, Innoc, NProt, AVTK/N, 
                    NAV/N, IBMAV/N 
 Removal Instructions:  Delete infected files 
 General Comments: 
       The Ada virus was discovered in Argentina in October, 1991.  Ada 
       is a memory resident infector of .COM files, including COMMAND.COM. 
       The first time a program infected with the Ada virus is executed, 
       Ada will install itself memory resident as a low system memory TSR. 
       Available system memory as measured by the DOS CHKDSK program will 
       have decreased by 21,296 to 21,312 bytes.  Interrupts 08, 13, and 
       21 will be hooked by the virus. 
       Once Ada is memory resident, it will infect .COM programs when they 
       are executed.  If COMMAND.COM is executed, it will also become 
       infected.  Programs infected with Ada will have a file size increase 
       of 2,600 bytes with the virus being located at the beginning of 
       infected files.  There will be no visible change in the program's 
       date and time in the DOS disk directory.  The following text strings 
       can be found in infected programs: 
               "HATI-HATI !! ADA VIRUS DISINI !!Delete" 
       Systems infected with Ada experience a slow clicking sound being 
       emitted from the system speaker.  This clicking will occasionally 
       change in pitch.  The user may also receive a "Disk full" error 
       even though the disk the user is attempting to write to is not 
       actually full. 

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