Ada (computer virus)

Ada is a computer virus that can affect any of the DOS operating systems.[1] Ada was first discovered in 1991.

ADA
Common nameAda
Technical nameADA
AliasesAda, Ada-2600, Ada.2600
FamilyN/A
ClassificationComputer Virus
TypeDOS
SubtypeCOM infector. Random nuisance.
Isolation1991
Point of isolationUnknown
Point of originArgentina
Author(s)Pessoa, nome, feminino = Ada ( Feliz, Própera, Desfragmentar, Vírus) Brasil

History

Ada virus was first discovered in Argentina in October, 1991. [2]

Characteristics

Ada is a memory resident (stays in the memory of the computer it infects after the program it infected executes) virus[3] that infects files. The Ada virus mainly targets .COM files, specifically COMMAND.COM.

Infected programs will have 2,600 bytes additional data inserted at the beginning of the file,[1] and the file itself will contain the text strings:

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


Another version of Ada has these text strings along with the strings BASURA BASURA repeated numerous times.

Computers infected with the Ada virus will often have a slow clicking sound emitting from their speakers; this clicking may sometimes change in pitch.[1] Computers infected also may show a "Disk Full" error even if the disk still has space on it.

While infected with the Ada virus, system memory measured by the DOS CHKDSK decreases by 21,296 bytes to 21,312 bytes. The virus will reside in the memory after an infected file is run and will infect any other .COM files executed on the computer. It will also hijack interrupts 08, 13 and 21.[1]

Infection route

There is only one way to infect a computer with the Ada virus; by executing an infected file. The infected file may come from a variety of sources: floppy disks, files downloaded from the Internet, and infected networks.[1]

References
  1. "ADA - Malware - McAfee Labs Threat Center". Vil.nai.com. Archived from the original on 2009-03-07. Retrieved 2014-04-10.
  2. "ADA". McAfee. Retrieved 12 February 2013.
  3. http://us.mcafee.com/VirusInfo/VIL/glossary_app.asp
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