EntropyCapture: Simple Extraction of DPAPI Optional Entropy

Intro

During a short application assessment, enumeration and decryption of a third-party application’s Windows Data Protection API (DPAPI) blobs using SharpDPAPI produced non-readable data because optional entropy was being used. This may be common with applications that use DPAPI to protect sensitive data (e.g., configurations, passwords, user information, etc.). Although traditionally, many operators focus on identifying and reverse engineering the binary that is protecting and unprotecting the data, this was not an option due to operational time constraints. The approach …

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