FBI e-mail clobbered after virus

The agency's webmail system was taken down; computer systems for the U.S. Marshals were hit earlier

A virus has reportedly disrupted Web-based e-mail services at the U.S. Federal Bureau of Investigation.

The FBI confirmed Friday that it had been forced to shut down its Internet-facing unclassified network, but disputed a report that the incident had left the agency unable to e-mail counterparts in other intelligence and law enforcement agencies.

"The external, unclassified network was shut down by the FBI as a precautionary measure," the FBI said in a statement.

"Within 48 hours of identifying the issue and mitigating risks, e-mail traffic was largely restored to the external, unclassified network."

FBI agents can send e-mail on the agency's more secure internal network or via BlackBerry, but many use this unclassified network to send messages via a Web-based e-mail system, said a source familiar with the situation.

That Web mail service was down throughout the week and continued to be unavailable for some users, the source said.

"We can e-mail to anyone ... and [we] have Internet access. We also have a secure e-mail system that connects all 400+ offices around the country and 60 offices overseas," FBI spokesman Paul Bresson said in an e-mail message.

The FBI did not provide details on the security incident, but it looks as though hackers may have used maliciously encoded file attachments to hack into the network.

In its statement, the FBI said it was now blocking users from sending or receiving attachments on the unclassified network "to give our technicians time to scan all the attachments that came into the e-mail system to make sure we have identified and mitigated all threats to the network."

Malicious attachments are a constant security threat for computer users.

Microsoft warned Thursday that attackers are sending malicious QuickTime media files to victims, exploiting an unpatched flaw in Apple's media format, in order to install malicious software on Windows systems.

News of the FBI's Web mail outage was first reported Friday by the New York Post, although other news outlets had reported last week that the FBI had been hit by the same virus that felled Windows systems within the U.S. Marshals.

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Robert McMillan

IDG News Service
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