The security of hundreds of Micro-Star International products is at risk due to hackers leaking private code signing keys stolen during a data breach last month.

The Money Message ransomware group began leaking stolen data last Thursday after “no agreement” was reached with the Taiwanese PC vendor, the group said on its data leak site. The group in April claimed responsibility for the attack and demanded a $4 million ransom.

Binarly, a cybersecurity company specializing in firmware supply chain security, analyzed the leaked data and discovered leaked private keys affecting various device vendors including Intel, Lenovo, Super Micro Computers and many others.