Danny Yadron reports:
Three months after the State Department confirmed hackers breached its unclassified email system, the government still hasn’t been able to evict them from the department’s network, according to three people familiar with the investigation.
Government officials, assisted by outside contractors and the National Security Agency, have repeatedly scanned the network and taken some systems offline. But investigators still see signs of the hackers on State Department computers, the people familiar with the matter said. Each time investigators find a hacker tool and block it, these people said, the intruders tweak it slightly to attempt to sneak past defenses.
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