On Monday, New Year’s Eve, a hacker group announced it had breached a law firm handling cases related to the September 11 attacks, and threatened to publicly release a large cache of related internal files unless their ransom demands were met. Advertisement The news is the latest public extortion attempt from the group known as The Dark Overlord, which has previously targeted a production studio working for Netflix, as well as a host of medical centres and private businesses across the United States.

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