Demystifying the Crypter Used in Emotet, Qbot, Dridex

### Executive summary This report analyzes a polymorphic crypter observed protecting Emotet, Qbot, and Dridex payloads and describes five stages of obfuscation and encryption, providing heuristics and pseudo-code to locate chunk descriptor tables, reconstruct scattered encrypted chunks, derive the encryption key, normalize PE alignment, and restore moved instructions to recover the core malware binary.