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Ada

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Virus.DOS.Ada is a memory resident parasitic virus on DOS.

There are 2 variants:

  • Virus.DOS.Ada.2600
  • Virus.DOS.Ada.3368

BehaviorEdit

When the virus is loaded into memory, it first beeps from the system speaker, and then returns to DOS.

After that the virus hooks INT 8, 13h and 21h, and then it infects any DOS executable that is run, and sometimes hangs the system.

The virus does not infect files smaller than itself. In the case of Ada.2600, the virus simply ignores the file; while that of Ada.3368 would crash the system when it tries to infect them.

Memory usageEdit

The following table shows the memory usage of the variants.

Variant Memory usage in bytes
Ada.2600 21,312
Ada.3368 21,312

PayloadEdit

When the virus is in memory the system speaker would emit a click sound in periods, and the sound may sometimes change in pitch.

Infected systems might show a "Disk full" error even there are free space available.

Other detailsEdit

Ada.2600 contains the internal text string:

COMMAND.COM
PCCILLIN.COM
PCCILLIN.IMG
HATI-HATI !! ADA VIRUS DISINI !!Delete

Ada.3368 contains the internal text string:

exeMAND.EXE
PCCILLIN.COM
PCCILLIN.IMG
PCCILLIN.exe
HATI-HATI !! ADA VIRUS DISINI !!Delete
basura

(Last sentence) Which translates to:

WATCH OUT !! HERE IS NO VIRUS !!Delete
trash

ReferencesEdit

Description of the Ada virus, Online VSUM

VideosEdit

Virus.DOS03:26

Virus.DOS.Ada

Ada virus review by dannoct1

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