Rattle is an EVM binary static analysis framework designed to work on deployed smart contracts. Rattle takes EVM byte strings, uses a flow-sensitive analysis to recover the original control flow graph, lifts the control flow graph into an SSA/infinite register form, and optimizes the SSA – removing DUPs, SWAPs, PUSHs, and POPs. The conversion from a stack machine to SSA form removes 60%+ of all EVM instructions and presents a much friendlier interface to those who wish to read the smart contracts they’re interacting with.
$ python3 rattle-cli.py --input inputs/kingofether/KingOfTheEtherThrone.bin -O
Would produce a register machine output like this:
Functions are recovered and split off. Additionally function arguments, memory locations, and storage locations are recovered.
Rattle runs on the runtime contract bytes, not the hex string. To convert to bytes, use xxd:
$ head contract.bin 608060405260043610610083576000357c01000000000000000000000... $ cat contract.bin | xxd -r -ps > contract.bytecode
If you're running rattle on a contract you can compile with solidity, use the
--bin-runtime option and strip off the header:
$ solc --bin-runtime KingOfTheEtherThrone.sol 2>/dev/null | tail -n1 | xxd -r -ps > contract.bytecode
If you get a syntax error like this:
File "rattle-cli.py", line 16 def main() -> None: ^ SyntaxError: invalid syntax
You likely ran rattle with python2 instead of python3.
For more details on the Rattle design and features, see my reCON Montreal presentation, which is annotated here.
Rattle is licensed and distributed under the AGPLv3 license. Contact us if you're looking for an exception to the terms.