The hackers have attacked the US Federal Bureau of Investigation (FBI) external email system, the law enforcement agency said, confirming previous media reports.
On November 13, Bloomberg reported that hackers sent tens of thousands of fake emails from an FBI account, warning of a possible cyber attack.
About 100,000 people received emails from an FBI server on Friday night, an email watchdog revealed.
The e-mail message was a strange, technically incoherent warning. The hacker signed on as the U.S. Department of Homeland Security Cyber Threat Detection and Analysis Group, which has not existed for at least two years.
Some of the emails were titled: “Urgent: system threat”.
Independent security group Spamhaus reported that the fake emails were sent in two periods as early as November 13 from an address on the Law Enforcement Enterprise Portal used by numerous government agencies.
U.S. authorities said they were aware of the fake emails being sent from an FBI account, but gave few details.
“This is an evolving situation and we are not able to provide any additional information at this time. “We continue to encourage the public to be vigilant,” said the FBI and the Department of Homeland Security.
There is no record of how emails were sent or which systems might have been compromised. The incident comes after a number of high-profile US government network breaches in recent months, including a Russia-based attack that compromised at least nine federal agencies and a China-based hacking campaign so severe that cybersecurity and the Security Agency infrastructure had to issue a rare mandate for all government agencies to update their software immediately.
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