Reverse Engineering Microsoft's Global Device Identifier (GDID): How Windows Fingerprinting Works
By
typeofhuman
Summary
This article provides a comprehensive technical deep-dive into Microsoft's Global Device Identifier (GDID), a persistent Windows fingerprinting mechanism. It debunks viral myths about GDID, explains how it is generated by the MSA Device PUID service (wlidsvc), consumed by the Connected Devices Platform (CDP), and surfaced through Delivery Optimization. The author traces GDID's role in the July 2026 Scattered Spider court complaint, documents its storage and transmission, provides methods for users to find their own GDID, and offers guidance on reducing exposure. The writeup is fully reproducible with a detailed methodology section.
Source
Hacker NewsReverse Engineering Microsoft's Global Device Identifier (GDID): How Windows Fingerprinting Worksgithub.comKey quotes
· 4 pulledHow Microsoft's 'Global Device Identifier', the persistent Windows fingerprint named in the July 2026 Scattered Spider complaint, is actually generated, stored, and transmitted.
The mint: MSA Device PUID (wlidsvc)
Where GDID surfaces: Delivery Optimization
How CDP gets it: it consumes, it does not compute
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