Simile (computer virus)

Simile (computer virus)

Win32/Simile (also known as Etap and MetaPHOR) is a metamorphic computer virus written in assembly language for Microsoft Windows. The virus was released in the most recent version in early March 2002. It was written by the virus writer Mental Driller. Some of his previous viruses, such as Win95/Drill (which used the Tuareg polymorphic engine), have proved very challenging to detect.

When the virus is first executed, it checks the current date. If the host file (the file that is infected with the virus) imports the file User32.dll, then on the 17th of March, June, September, or December, a message is displayed. Depending on the version of the virus the case of each letter in the text is altered randomly. On May 14 (the anniversary of Israeli independence day), a message saying "Free Palestine!" will be displayed if the system locale is set to Hebrew.

The virus then rebuilds itself. This metamorphic process is very complex and accounts for around 90% of the virus' code. After the rebuild, the virus searches for executable files in folders on all fixed and remote drives. Files will not be infected if they are located in a subfolder more than three levels deep, or if the folder name begins with the letter W. For each file that is found, there is a 50 percent chance that it will be ignored. Files will not be infected if they begin with F, PA, SC, DR, NO, or if the letter V appears anywhere in the file name. Due to the way in which the name matching is done, file names that contain certain other characters are also not infected, although this part is not deliberate. The virus contains checks to avoid infecting "goat" or "bait" files (files that are created by anti-virus programs). The infection process uses the structure of the host, as well as random factors, to control the placement of the virus body and the decryptor.

References


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • 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

  • Timeline of computer viruses and worms — Contents 1 1960–1969 1.1 1966 2 1970–1979 2.1 1 …   Wikipedia

  • Timeline of notable computer viruses and worms — This is a timeline of noteworthy computer viruses and worms.1970 1979Early 1970s* Creeper virus was detected on ARPANET infecting the Tenex operating system. Creeper gained access independently through a modem and copied itself to the remote… …   Wikipedia

  • Linux malware — includes viruses, trojans, worms and other types of malware that affect the Linux operating system. Linux, Unix and other Unix like computer operating systems are generally regarded as very well protected, but not immune, from computer viruses.… …   Wikipedia

  • Metamorphic code — In computer virus terms, metamorphic code is code that can reprogram itself. Often, it does this by translating its own code into a temporary representation, editing the temporary representation of itself, and then writing itself back to normal… …   Wikipedia

  • Liste des malwares Linux — Les systèmes d exploitation GNU/Linux, Unix et « Unix like » sont en général considérés comme protégés des virus informatiques[1]. En effet, jusqu à présent, aucun virus opérant sous Linux n a été répertorié comme étant très répandu,… …   Wikipédia en Français

  • ZMist — (also known as Zombie.Mistfall) is a metamorphic computer virus created by Russian virus writer known as Z0mbie. It was the first virus to use a technique known as code integration . In the words of Szor and Ferrie (see link below):This virus… …   Wikipedia

  • Вредоносные программы для Unix-подобных систем — Вероятно, первые компьютерные вирусы для семейства ОС Unix были написаны Фредом Коэном в ходе проведения экспериментов. В конце 1980 х появились первые публикации с исходными текстами вирусов на языке sh.[1] …   Википедия

Share the article and excerpts

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