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Ada
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ADA
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N/A
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Ada, Ada-2600, Ada2600
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Virus
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DOS
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COM infector Random nuisance
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1991
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Unknown
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Argentina
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Unknown
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is a memory resident, file infecting
Computer Virus which infects
COM File s, including
Command.com . It was first discovered in Argentina in October, 1991. Upon infection, Ada becomes memory resident as a low system memory
TSR . Once it is memory resident, Ada infects .COM files as they are executed, such as
command.com. Programs infected with Ada will have a file size increase of 2,600
Byte s with the virus being located at the beginning of infected files. An infected file's date and time in the DOS disk directory listing are not altered. Available system memory as measured by the DOS CHKDSK program will have decreased by 21,296 to 21,312 bytes.
Interrupt s 08, 13, and 21 are hooked by the virus. Systems infected with Ada experience a slow clicking sound being emitted from the system
Speaker . This clicking will occasionally change in
Pitch . False and random "disk full" messages may also appear.
The following text
String s are found in infected files:
- "COMMAND.COM"
- "PCCILLIN.COM"
- "PCCILLIN.IMG"
- "HATI-HATI !! ADA VIRUS DISINI !!Delete"
Ada specifically attacks the PC-cillin antivirus package, deleting PC-cillin if it is found.
