At least 30,000 US organisations including local governments have been hacked in recent days by an “unusually aggressive” Chinese cyber-espionage campaign, according to a computer security specialist.
The campaign has exploited recently discovered flaws in Microsoft Exchange software, stealing email and infecting computer servers with tools that let attackers take control remotely, Brian Krebs said in a post at his cybersecurity news website.
“This is an active threat,” White House spokeswoman Jennifer Psaki said when asked about the situation during a press briefing on Friday.
“Everyone running these servers needs to act now to patch them. We are concerned that there are a large number of victims,” she added.