Ada (computer virus)
| Ada | |
|---|---|
| Technical name | ADA |
| Alias | Ada, Ada-2600, Ada.2600 |
| Type | DOS |
| Subtype | COM infector. Random nuisance. |
| Classification | Computer virus |
| Family | N/A |
| Origin | Argentina |
| Authors | Pessoa, nome, feminino = Ada ( Feliz, Própera, Desfragmentar, Vírus) Brasil |
Ada is a computer virus that can affect any of the DOS operating systems.[1] Ada was first discovered in 1991.
It primarily infects .COM files, inserting additional data into them and remaining in the system's memory even after the infected program runs. Infected computers may exhibit a slow clicking sound from the speakers and show a "Disk Full" error when space is available. The Ada virus reduces the system memory and can infect any .COM files executed on the computer. The only way to contract the virus is by running an infected file, which could be obtained from floppy disks, internet downloads, or infected networks.
History
Ada virus was first discovered in Argentina in October 1991.[2]
Characteristics
Ada is a memory resident virus[3] that infects files. The Ada virus mainly targets .COM files, specifically COMMAND.COM and stays in the memory of the computer it infects after the program it infected executes.
Infected programs have 2,600 bytes additional data inserted at the beginning of the file,[1] and the file itself contains 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 often have a slow clicking sound emitting from their speakers; this clicking may sometimes change in pitch.[1] Infected computers 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 resides in the memory after an infected file is run and will infect any other .COM files executed on the computer. It also hijacks 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
- ^ a b c d e "ADA - Malware - McAfee Labs Threat Center". Vil.nai.com. Archived from the original on 2009-03-07. Retrieved 2014-04-10.
- ^ "ADA". McAfee. Retrieved 12 February 2013.
- ^ "McAfee | Antivirus, VPN, Identity Protection - Download Free".