The Russian state hackers who broke into Microsoft earlier this year have done it again. The Midnight Blizzard group has likely stolen source code from the company in a new attack, though Microsoft has not said what information it is interested in. Customers don’t seem to be affected.

Microsoft He writes in a blog post That hackers broke into the company again. It may have to do with the Nobelium group, which Microsoft itself calls the Midnight Blizzard. Most security experts link this group to Russia. The group actually hit Microsoft in January this year. The company says the same hackers have now infiltrated again.

“In recent weeks, we have seen Midnight Blizzard use information it initially stole from our email systems to gain unauthorized access,” Microsoft wrote. This relates to access to the internal systems of Microsoft itself; According to the company, there is currently no evidence that customers have also been affected.

According to Microsoft, the attackers stole the source code during this access. It’s about “some source code repositories,” but the company doesn’t explain what these are or what hackers might be able to do with them.

The attackers are said to have carried out their attacks in recent weeks. They used, among other things, Secrets Which in some cases is stored in emails. Microsoft says the information was stolen in previous attacks that hackers used to map the network and find vulnerabilities.