A Department of Defense bulletin on a ‘leaking’ sinkhole has baffled cybersecurity experts

In mid-April, an obscure agency housed under the Department of Defense issued a bulletin that a little-known, Chinese-linked hacking group is likely responsible for some suspicious activity aimed at defense contractors in the U.S. But how the Defense Counterintelligence and Security Agency (DCSA) came to that conclusion is complicated. The alert, sent to 38 contractors, says DCSA detected the group was making “inbound and outbound connections” with contractors’ facilities as of Feb. 1. The targeting, which appeared to have stopped by March 25, was directed at several critical infrastructure sectors, including aerospace, health care and maritime, according to a copy of the bulletin obtained by CyberScoop. A DCSA official tells CyberScoop the document was meant to raise awareness among the contractors, but numerous sources tell CyberScoop that it is more confusing than clarifying. The bulletin, which was first reported by Politico, has raised questions about the attributed hacking group and if the actions described […]

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