A criminal complaint against alleged Scattered Spider member Peter Stokes revealed that Microsoft can associate Windows activity with a persistent "Global Device ID," which investigators used to link his PC to online activity connected to a hack. While unique device IDs are common, the case has raised privacy concerns because the identifier can apparently persist across updates, has no simple opt-out, and may allow Microsoft to connect a Windows installation to activity on third-party services. PCMag reports: Last week, the U.S. announced it had extradited 19-year-old Peter Stokes from Europe for allegedly being a member of the notorious hacking group Scattered Spider. But the case stands out because Microsoft played a key role in linking Stokes to the suspected hacking crimes, according to an unsealed criminal complaint. Stokes allegedly hacked an unnamed luxury jewelry retailer in May 2025 while using a VPN. The 39-page criminal complaint shows the FBI used Microsoft records to discover that his IP address was associated with a Microsoft device identifier known as Global Device ID (GDID).

"According to a Microsoft representative, a Global Device Identifier in the Windows ecosystem is a persistent, device-level identifier designed to uniquely identify an installation of a Windows operating system on a device, either a physical device (e.g., a mobile phone or laptop) or virtual machine, across certain Microsoft services and scenarios," the complaint explains. The global device ID isn't exactly surprising, given that it's standard practice to assign a unique ID to each account or device so a tech provider can recognize and distinguish between them. But the complaint reveals Microsoft can associate the GDID with third-party services and the timing as well, giving Redmond a way to theoretically track a user's online activity. In other words, Redmond might be able to track the online activity of your Windows PC without third-party browser cookies.

Stokes was discovered exploiting a web development tool called ngrok to bypass the jewelry retailer's network defenses. The complaint says Microsoft had records showing that on May 12, 2025, at 19:21 UTC, the GDID associated with Stokes' computer "accessed, among other ngrok pages, 'https://dashboard[.]ngrok.com/signup,' the ngrok page to set up an ngrok account." The document adds that Microsoft records also showed the GDID accessing "multiple sites" from servers at Tzulo, a web hosting provider, to help pull off the hack. Hence, the fact that federal investigators used the Microsoft identifier to nab a suspected hacker is raising concerns that it could be abused for other surveillance purposes. "Microsoft Windows is surveillance software," cybersecurity expert Matthew Hickey alleged in a tweet.