Iran has fixed a few of its P.C. systems were putrescent with the Duqu trojan, but said it has found a way to manage the malware.
Security organisations had formerly identified Iran as one of at least 8 countries targeted by the code.
The spyware is believed to have been written to rob information to help launch serve cyber attacks.
The sender has not been identified, but researchers have found a anxiety to a US radio programme in Duqu's code.
The Iranian headlines agency, IRNA, reported that the country's cyber counterclaim section was receiving stairs to war the infection.
"The program to manage the pathogen has been created and done existing to organisations and corporations," Brigadier General Gholamreza Jalali, head of Iran's polite counterclaim body, is quoted as saying.
"All the organisations and centres that could be receptive to being polluted are being controlled."
Mr Jalali said a "final report" in to that organisations had been targeted was still being worked on.
Last year the Iranian supervision indicted the West of perplexing to interrupt its chief services using the Stuxnet worm P.C. attack.
Then in April 2011 officials said the country's services had been targeted by a second square of malware dubbed "Stars".
Officials right away explain the Duqu assault as the "third virus" to strike Iran.
The P.C. safety dilettante Kaspersky Lab said it believed that "Stars" was a keylogging program that might have been segment of the same assault that commissioned Duqu.
Keylogging programs are able to gather information about a P.C. system, take screenshots, finding for files and takeover passwords.
The definite moreover supposing more item about how Duqu worked formed on its review of other targets.
It said other unclear firm received an email from an particular identifying himself as Mr B Jason who requested a joint business venture.
The definite believed this was a anxiety to the Jason Bourne books and view movies.
The target was asked to open a Microsoft Word accessory that referenced the targeted company's name in its title, and thus did not show up to be spam.
It said that for every plant a well-defined set of assault files was created using a not similar manage server. The definite said this happened at least 12 times.
When the addressee non-stop the record the malware became active by a Truetype rise exploit, but did nothing until it rescued that there had been no set of keys or rodent wake up for 10 minutes.
Kaspersky Lab said the rise was called Dexter Regular and its creators were identified as Showtime Inc.
"This is other antic pulled by the Duqu authors, given Showtime Inc is the line report firm at the back the TV array Dexter, about a CSI doctor who happens moreover to be a sequence killer," the report said.
The definite said the take advantage of then loaded a motorist onto the system. Analysis of the motorist referred to it was gathered as long ago as Aug 2007.
"If this information is correct, then the authors of Duqu contingency have been working on this plan for over 4 years," the report said.
The definite said the motorist then began a routine that led to the Duqu trojan being commissioned permitting the enemy to deliver new modules, taint other networked computers, and gather information.
The firm said efforts to pick out the enemy have been complex by the fact that the suspects show up to have deactivated several of the manage servers think to have been entangled in the attacks.
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