94237eac80fd2a20880180cab19b94e8760f0d1f06715ff42a6f60aef84f4adf
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humpty_tony
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medium
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This post’s goal is to show how you reverse a “boring” stealer by treating the loader chain as the real specimen.
Peel multi-stage Python loaders safely:
- Identify and undo container transforms (reverse bytes + zlib).
- Recognize when crypto code is “almost right” but relies on a modified library (the PyAES GCM mismatch), then swap in a compatible implementation to decrypt without executing.
- Deal with Python marshalled bytecode.
- Reduce obfuscation to primitives (base64 aliasing, rot13, marshal.loads, LZMA/XZ payloads, BlankOBF patterns), so you can turn “giant blob soup” into discrete stages you can write to disk, identify with file, and decompile.
So the analysis goal is basically: build a repeatable methodology for unpacking + staging + version-correct decompilation of Python malware—because that workflow applies to tons of commodity stealers and loaders.
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04 Jan 2026
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