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defeating-control-flow-flattening

Defeats control-flow-flattening obfuscation by identifying the dispatcher/state- variable structure and reconstructing the original control flow so the logic becomes readable. Activates for requests to defeat control-flow flattening, deobfuscate an OLLVM-flattened function, or recover original control flow from a dispatcher loop.

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See how to install

Files included (4)

  • SKILL.md2.7 KB
  • LICENSE340 B
  • references/api-reference.md1.3 KB
  • scripts/analyst.py2.3 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

Defeating Control-Flow Flattening

When to Use

  • A function is flattened (a dispatcher loop switching on a state variable, with original blocks as switch cases) and you need to recover the original control flow.
  • You are reversing OLLVM-style or similar flattening.

Do not use this on non-flattened code — confirm the dispatcher/state-variable pattern first. This skill analyzes disassembly/CFG data statically and executes nothing.

Prerequisites

  • A disassembled function's basic-block/edge data (e.g., exported from Ghidra/IDA/Binary Ninja as JSON).

Workflow

Step 1: Detect the flattening structure

python scripts/analyst.py detect cfg.json

Identifies a dispatcher block (high in-degree, switch/compare on a state variable) and the relay/ case blocks that all branch back to it.

Step 2: Recover state transitions

Track the constant assigned to the state variable in each case to determine the successor block, rebuilding the true edges.

Step 3: Reconstruct the original CFG

Emit the deflattened successor mapping (case → next case) for re-annotation in the disassembler.

Step 4: Verify

Confirm the recovered flow has a single entry, sane successors, and no orphan blocks.

Validation

  • The dispatcher is identified by in-degree and state-variable comparison.
  • Each case's next-state constant maps to a real successor block.
  • The reconstructed CFG covers all original (non-relay) blocks.

Pitfalls

  • State variable computed (not a constant) — requires emulation/symbolic execution.
  • Multiple dispatchers or nested flattening.
  • Opaque predicates and bogus blocks inflating the case set.

References

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