SetWindowDisplayAffinity Bypass Techniques

SetWindowDisplayAffinity is used by applications to prevent screen capture and remote desktop streaming. This post covers practical bypass approaches used in legitimate security research and compatibility scenarios.

Understanding the API

`SetWindowDisplayAffinity` allows a window to be marked with `WDA_EXCLUDEFROMCAPTURE`, which excludes it from capture APIs. We explore how this affects different capture methods and what techniques can restore capture capability where authorized.

Hook-Based Approaches

Kernel and user-mode hooks can intercept the affinity checks. We discuss the trade-offs between stability and detection risk, and recommend using signed drivers and minimal hooks for production use.

References