WASHINGTON: The Justice Department and the federal court system disclosed on Wednesday that they were among the dozens of U.S. government agencies and private businesses compromised by a massive cyberespionage campaign that U.S. officials have linked to elite Russia hackers.
The extent of the damage was unclear.
The department said that 3% of its Microsoft Office 365 email accounts were potentially affected, but did not say to whom those accounts belonged. There are no indications that classified systems were affected, the agency said. Office 365 isn’t just email but a collaborative computing environment, which means that shared documents were also surely accessed, said Dmitri Alperovitch, former chief technical officer of the cybersecurity firm CrowdStrike.
Separately, the Administrative Office of U.S. Courts informed federal judicial bodies across the nation that the courts nationwide case management system was breached, potentially giving the hackers access to sealed court documents.
The Justice Department said that on Dec. 24 it detected “previously unknown malicious activity” linked to the broader intrusions of federal agencies revealed earlier that month, according to a statement from spokesman Marc Raimondi.
Separately, the court office said on its website that an apparent compromise of the U.S. judiciary’s case management and electronic case file system was under investigation.
The Department of Homeland Security was scouring the system, it said, and cited a particular risk to sealed court filings, whose disclosure could jeopardize active criminal investigations.
The potential reach is vast. The actual reach is probably significant, said a federal court official who spoke on condition of anonymity because they were not authorized to disclose the information. The official confirmed that the scope of the compromise was national but it was not clear how widespread.
On Tuesday, federal law enforcement and intelligence agencies formally implicated Russia in the intrusions, calling them part of a suspected intelligence gathering operation. President Donald Trump had previously questioned that consensus, suggesting without foundation that China could be to blame.
The hacking campaign was extraordinary in scale, with the intruders stalking through government agencies including the Treasury and Commerce departments, defense contractors and telecommunications companies for months by the time the breach was discovered.
Experts say that gave the foreign agents ample time to collect data that could be highly damaging to U.S. national security, although the scope of the breaches and exactly what information was sought is unknown.
An estimated 18,000 organizations were seeded with malicious code that piggybacked on popular network-management software from an Austin, Texas, company called SolarWinds. But only a subset are believed to have been compromised. Tuesday’s statement said that fewer than 10 federal government agencies have so far been identified as having been hacked.
Johns Hopkins cyberespionage expert Thomas Rid said the 3% figure of email accounts accessed at Justice may not sound like a lot, but that it doesnt mean that the hackers “didnt get to the interesting stuff.
Cybersecurity experts responding to the hack say highly skilled cyber spies of the caliber behind the SolarWinds hack are apt to keep their footprint as small as possible to avoid detection targeting only high-value email and documents.
Rid wondered how sure the Justice Department could be about the extent of its compromise.
How good is their own visibility given that U.S. government agencies totally missed the breach in the first place? he said. Are they really on top of the problem? Are we only really seeing the tip of the iceberg?
The breach was discovered by FireEye, a prominent cybersecurity company, on its network. It then identified and notified other victims.
Experts expect the severity of the hack and the number of victims identified to increase over time.
History tells us that if you have a large breach, not just in one organization but across an entire government an entire sector it will take a long time to identify who are the victims and how badly they are compromised, said Rid.
Microsoft declined to comment on long the intruders were reading emails in the Justice Department’s Office 365 environment, which is typically a cloud-based service hosted by the software provider.
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Bajak reported from Boston. Associated Press writers Mark Sherman in Washington and Maryclaire Dale in Philadelphia contributed to this report.
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