SECURITY FIRM: CHINESE HACKERS BROKE INTO EMAIL SECURITY APPLIANCE IN SPYING CAMPAIGN

Suspected state-backed Chinese hackers used a security hole in a popular email security appliance to break into the networks of hundreds of public and private sector organizations globally, nearly a third of them government agencies including foreign ministries, the cybersecurity firm Mandiant said Thursday.

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"This is the broadest cyber espionage campaign known to be conducted by a China-nexus threat actor since the mass exploitation of Microsoft Exchange in early 2021, Charles Carmakal, Mandiant's chief technical officer, said in a emailed statement. That hack compromised tens of thousands of computers globally.

In a blog post Thursday, Google-owned Mandiant expressed "high confidence" that the group exploiting a software vulnerability in Barracuda Networks' Email Security Gateway was engaged in "espionage activity in support of the People's Republic of China." It said the activivity began as early as October.

The hackers sent emails containing malicious file attachments to gain access to targeted organizations' devices and data, Mandiant said.