Microsoft said on Monday it won a court order that allowed the tech giant to take control of 50 websites that a North Korea-linked hacking group was using to carry out cyberattacks.
The group called "Thallium," believed to be operating from North Korea, was using a technique known as spear phishing to trick its victims, Microsoft said in a blog post.
By gathering information about individuals through the public domain and social media, the hackers crafted personalized emails that looked credible. Those emails directed users to fraudulent websites where their account login details were compromised, which allowed the attackers to read emails, look at contact lists and access calendar appointments, according to Microsoft.
Thallium was also using malicious software to compromise systems and steal sensitive data.
The group's targets included government employees, think tanks, university staff and individuals working on nuclear proliferation issues. Most of them were based in the United States, Japan, and South Korea.
Microsoft said Thallium was the fourth nation-state hacking group against which it filed legal actions to take down the infrastructure they use to carry out cyberattacks.