Evasive Measures: How BadPack Hides Android Malware

This brief describes BadPack, a technique that tampers with APK/ZIP headers to hinder static analysis and hide Android malware payloads, and details Trinity Cyber’s analysis of a BadPack-sample used to deliver the TeaBot banking trojan. The report explains the layered evasion chain (header manipulation, scrambled asset names, SPECK 64/128 encryption, multi-stage decompression/decryption, and runtime DEX loading), documents observed C2 activity stopped by Trinity Cyber, and emphasizes network-layer full content inspection as an effective mitigation.