Ah (computer virus)

Ah (computer virus)

Computer virus
Fullname = Ah
Common name = Ah
Technical name = Jerusalem.Ah
Family = N/A
Aliases = David-1173, Tuesday
Classification = Virus
Type = DOS
Subtype = COM infector. Buggy, causes system hangs.
IsolationDate = 1991
Isolation = Unknown
Origin = Italy
Author = Unknown, not David Grant and the PCVRF

Ah (also known as "Tuesday" and "Jerusalem.Ah") is a very buggy computer virus which infects COM files including command.com. Ah is based on the V1024 virus, and originated in Italy on May, 1991. When the first program infected with Ah is executed, Ah will install itself memory resident at the top of system memory, but below the 640K DOS boundary. After it is memory resident, Ah will infect .COM programs over 1K in length when they are executed. Infected programs will increase in size by 1,173 bytes, though the file length increase will be hidden if Ah is resident. Their date and time in the DOS directory will appear to be unaltered, though if the program's original time was 12:00a, it will now be blank. The virus will be located at the beginning of infected programs. Total system and available free memory, as indicated by the DOS CHKDSK program, will decrease by 1,216 bytes. Interrupts 08 and 21 will be hooked by the virus. Systems infected with Ah will experience frequent system hangs. These hangs occur when the user attempts to execute a .COM program which is infected with Ah. They may also occur when the virus attempts to infect an uninfected program. System hangs occur so frequently with Ah that the virus is very noticeable. The Ah virus activates on Tuesdays, at which time it will attempt to format the first few tracks of the system hard disk.

The following text string is found in infected files:
*"(C) David Grant Virus Research 1991 PCVRF Disribuite this virus freely!!! ...ah...John...Fuck You!"

Ah is believed to have been created by the same person as several other viruses from Italy, including Smack and Enigma. David Grant and the PCVRF had nothing to do with its creation.

The Ah virus has also been associasted with the 'mole' movement of computer viruses suspected to be lead by Lee Morton a potential cross dressing hacker.The only information known on Lee Morton is a note left after then famous 'davgreen' virus that read : "The secrecy is killing me"

External links

* [http://www.probertencyclopaedia.com/L21.HTM Computer Viruses (A)] , by Probert Encyclopedia
* [http://vil.nai.com/vil/content/v_98147.htm Ah virus] , by McAfee


Wikimedia Foundation. 2010.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • computer virus — Virus Vi rus, n. [L., a slimy liquid, a poisonous liquid, poison, stench; akin to Gr. ? poison, Skr. visha. Cf. {Wizen}, v. i.] 1. (Med.) Contagious or poisonous matter, as of specific ulcers, the bite of snakes, etc.; applied to organic poisons …   The Collaborative International Dictionary of English

  • computer virus — UK US noun [C] IT, INTERNET ► VIRUS(Cf. ↑virus) …   Financial and business terms

  • Computer virus — Not to be confused with Malware. A computer virus is a computer program that can replicate itself[1] and spread from one computer to another. The term virus is also commonly but erroneously used to refer to other types of malware, including but… …   Wikipedia

  • Computer-Virus — Ein Computervirus (von lateinisch virus für „Gift“, „Schleim“; im Singular „das Computervirus“, alltagssprachlich auch „der Computervirus“, Plural „die Computerviren“) ist ein sich selbst verbreitendes Computerprogramm, welches sich in andere… …   Deutsch Wikipedia

  • Computer Virus — Ein Computervirus (von lateinisch virus für „Gift“, „Schleim“; im Singular „das Computervirus“, alltagssprachlich auch „der Computervirus“, Plural „die Computerviren“) ist ein sich selbst verbreitendes Computerprogramm, welches sich in andere… …   Deutsch Wikipedia

  • computer virus — UK / US noun [countable] Word forms computer virus : singular computer virus plural computer viruses a program that enters your computer and damages or destroys information that you have stored …   English dictionary

  • computer virus — kompiuterių virusas statusas T sritis informatika apibrėžtis Parazitinė programa, prisijungianti prie ↑vykdomųjų failų arba failų, turinčių vykdomųjų komponentų (pvz., makroprogramų), gaminanti savo kopijas ir jomis užkrečianti kitus failus,… …   Enciklopedinis kompiuterijos žodynas

  • Abraxas (computer virus) — Computer virus Fullname = Abraxas Common name = Abraxas Technical name = Abraxas Family = N/A Aliases = Abraxas5 Classification = Virus Type = DOS Subtype = COM and EXE infector. IsolationDate = 1993 Isolation = Unknown Origin = Europe Author =… …   Wikipedia

  • Ada (computer virus) — Computer virus Fullname = ADA Common name = Ada Technical name = ADA Family = N/A Aliases = Ada, Ada 2600, Ada.2600 Classification = Virus Type = DOS Subtype = COM infector. Random nuisance. IsolationDate = 1991 Isolation = Unknown Origin =… …   Wikipedia

  • 4K (computer virus) — Computer virus Fullname = 4K Common name = 4K Technical name = 4K Family = N/A Aliases = Frodo, IDF, Israeli Defence Classification = Virus Type = DOS Subtype = COM,EXE IsolationDate = 1990 Isolation = Unknown Origin = Unknown Author = Unknown4k… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”