Reuters: Iranian officials say they have detected the Duqu virus on their systems. "We are in the initial phase of fighting the Duqu virus," said Gholamreza Jalali, the head of Iran's civil defense organization. "The final report which says which organizations the virus has spread to and what its impacts are has not been completed yet. All the organizations and centers that could be susceptible to being contaminated are being controlled."
Duqu is a variant of the Stuxnet cyber-weapon, which targeted Iran's nuclear capabilities. While Stuxnet sabotaged industrial control systems, Duqu appears to be gathering information about those systems.