US Government Taking Creative Steps to Counter Cyberthreats

WASHINGTON - An FBI operation that gave law enforcement remote access to hundreds of computers to counter a massive hack of Microsoft Exchange email server software is a tool that is likely to be deployed "judiciously" in the future as the Justice Department, aware of privacy concerns, develops a framework for its use, a top national security official said Wednesday.

The department this month announced that it had obtained a warrant from a federal judge in Texas to remove web shells, or malicious code that gives hackers a foothold into networks, from hundreds of vulnerable computers affected by a hack that Microsoft has blamed on a group operating from China. The FBI operation was designed to disrupt the effects of a hack that affected many thousands of servers running the Microsoft Exchange email program. Many victims took steps on their own to safeguard their systems, but for those that who did not, the Justice Department stepped in to do it for them with a judge's approval. It was the virtual equivalent of police going around the neighborhood locking doors that criminals had opened remotely.