Audio Steganography in Supply Chain Attacks

This tutorial explains how attackers hide malware inside WAV audio files using steganography, based on the real-world TeamPCP supply chain campaign from March 2026 that compromised popular PyPI and npm packages including Trivy, litellm, and the Telnyx SDK. The technique uses payload packing—embedding base64-encoded, XOR-encrypted payloads within valid WAV file frames while maintaining legitimate audio headers—to evade network inspection tools, EDR software, and MIME-type checks. The tutorial breaks down the five-step attack chain, provides hands-on encoder/decoder code examples, and covers detection strategies including entropy analysis, frame data validation, network traffic monitoring, and package integrity verification. Defenses include pinning dependencies with hash verification, using SCA tools, monitoring for unexpected network activity, implementing egress filtering, and verifying package provenance against source repositories. 

https://pwn.guide/free/cryptography/audio-steganography

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