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Stuxnet is a malicious computer wormfirst uncovered inthought to have been in development since at least Stuxnet targets supervisory control and data acquisition SCADA systems and is Movie Analysis The Wild Bunch to be responsible for causing substantial damage to the nuclear program of Iran.

Although neither country has openly admitted responsibility, the worm is widely understood to be a cyberweapon built jointly by the United States and Israel. Stuxnet specifically targets programmable logic controllers PLCswhich allow the automation of electromechanical processes such as those used to control machinery and industrial processes including gas centrifuges for separating nuclear material. Exploiting four zero-day flaws, [5] Stuxnet functions by targeting machines using the Microsoft Windows operating system and networks, then seeking out Siemens Step7 software.

Stuxnet reportedly compromised Iranian Movie Analysis The Wild Bunch, collecting information on industrial systems and causing the fast-spinning centrifuges to tear themselves apart. Stuxnet has three modules: a worm that executes all routines related to the main payload of the attack; a link file that automatically executes the propagated copies of the worm; and a rootkit component responsible for hiding all malicious files and processes, to prevent detection of Stuxnet. The worm then propagates across the network, scanning for Siemens Step7 software on computers controlling a PLC. In the absence of either criterion, Stuxnet becomes dormant inside the computer. If both the conditions are fulfilled, Stuxnet introduces the infected rootkit onto the PLC and Step7 software, modifying the code and giving unexpected commands to the PLC while returning a loop of normal operation system values back to the users. InKaspersky Lab noted that the Equation Group had used two of the same zero-day attacks prior to their use in Stuxnet and commented that "the similar type of usage of both exploits together in different computer worms, at around the same time, indicates that the Equation Group and the Stuxnet developers are either the same or working closely together".

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InChronicle researchers Juan Andres Guerrero-Saade and Silas Cutler presented evidence of at least four distinct threat actor malware platforms collaborating to create the different versions of Stuxnet. Stuxnet, discovered by Sergey Ulasen, initially spread via Microsoft Windows, and targeted Siemens industrial control systems.

While it is not the first time that hackers have targeted industrial systems, Movue nor the first publicly known intentional act of cyberwarfare to be implemented, it is the first discovered malware that spies on and subverts industrial systems, [24] and the first to include a programmable logic controller PLC Movie Analysis The Wild Bunch. The worm initially spreads indiscriminately, but includes a highly specialized Moive payload that is designed to target only Siemens supervisory control and data acquisition SCADA systems that are configured to control and monitor specific industrial processes. In Maythe PBS program Need To Know cited a statement by Gary SamoreWhite House Coordinator for Arms Control and Weapons of Mass Destruction, in which he said, "we're glad they [the Iranians] are having trouble with their centrifuge machine and that we — the US and its allies — are doing everything we can to make sure that we complicate matters for them," offering "winking acknowledgement" of US involvement in Stuxnet.

Bush and executed under President Barack Obama. On 25 Decemberan Iranian semi-official news agency announced there was continue reading cyberattack by Stuxnet, this time on the industries in the southern area of the country.

The malware targeted a power plant and some other industries in Hormozgan province in recent months. According to expert Eugene Kasperskythe worm also infected a nuclear power plant in Russia. Kaspersky noted, however, that since the power plant is not connected to the public Internet, the system should remain safe.

The worm was at first identified by the security company VirusBlokAda in mid-June Tmphider;" [48] Symantec however called it "W Temphid," later changing to "W Kaspersky Lab experts at first estimated that Stuxnet started spreading Movie Analysis The Wild Bunch March or April[52] but the first variant of the worm appeared in June This attack, from an unknown source but likely related to Stuxnet, disabled one of the lists, thereby interrupting an important source of information for power plants and factories. The second variant, with substantial improvements, appeared in Marchapparently because its authors believed that Stuxnet was not spreading fast enough; a third, with minor improvements, appeared in April A study of the spread of Stuxnet by Symantec showed that the main affected countries in the early days of the infection were Bunh, Indonesia and India: [56].

Iran was reported to have "beefed up" its cyberwar abilities following the Stuxnet attack, and has been suspected of retaliatory attacks against US banks. Vanity Fair Moviie, April[47].

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Unlike most malware, Stuxnet does little harm to computers and networks that do not meet specific configuration requirements; "The attackers took great care to make sure that only their designated targets were hit It was a marksman's job. For its targets, Stuxnet contains, among Anlaysis things, code for a man-in-the-middle attack that fakes industrial process control sensor signals so an infected system does not shut down due to detected abnormal behavior.

The worm consists of a layered attack against three different systems:.]