cold fjord sends news that Iran's breach of a computer network belonging to the U.S. Navy was more serious than originally thought. According to a Wall Street Journal report (paywalled, but summarized at The Verge), it took the Navy four months to secure its network after the breach, and the repair cost was approximately $10 million. From the article: "The hackers targeted the Navy Marine Corps Intranet, the unclassified network used by the Department of the Navy to host websites, store nonsensitive information and handle voice, video and data communications. The network has 800,000 users at 2,500 locations, according to the Navy. ... The intrusion into the Navy's system was the most recent in a series of Iranian cyberoffensives that have taken U.S. military and intelligence officials by surprise. In early 2012, top intelligence officials held the view that Iran wanted to execute a cyberattack but had little capability. Not long after, Iranian hackers began a series of major "denial-of-service" attacks on a growing number of U.S. bank websites, and they launched a virus on a Saudi oil company that immobilized 30,000 computers. ... Defense officials were surprised at the skills of the Iranian hackers. Previously, their tactics had been far cruder, usually involving so-called denial of service attacks that disrupt network operations but usually don't involve a penetration of network security."