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Talk @ ToorCon XX – 2018: Reversing Ethereum Smart Contracts

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2018/09/15 @ ToorCon XX – 2018

Ethereum is the reference of smart contract platform due to the possibility to create decentralized applications (Dapps) by writing smart contracts. The Solidity source code of those smart contracts are not always available and can contains flaws (reentrancy, integer overflow/underflow, bad randomness, backdoor, ….).

Some smart contract handle thousand of ETH and can’t be modified once pushed into the blockchain. More than 90% of them doesn’t provide the associated Solidity source code and that’s also why be able to reverse and analyze Ethereum smart contract (only with the EVM bytecode) make even more sense.

link / slides

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Talk @ ToorCon XX – 2018: Dissection of WebAssembly module

 

toorcon webassembly wasm patrick ventuzelo reversing analysis ethereum evm

2018/09/15 @ ToorCon XX – 2018

WebAssembly (WASM) is a new binary format currently developed and supported by all major browsers including Firefox, Chrome, WebKit /Safari and Microsoft Edge through the W3C. This new format have been designed to be “Efficient and fast“, “Debuggable“ and “Safe” that why it is often called as the “game changer for the web“. More than one year after the “official” release, it is not only used “for the web” by web browsers but also in some (huge) other projects like Blockchain Smart Contract platforms (EOS and Ethereum).

I will first introduce WebAssembly concepts and who currently used it in the wild. Secondly, I will show different WebAssembly VM available and explain the security measures implemented into it. Finally, I will show you, throw real life WASM modules, how to do static analysis, using techniques such as reversing, control flow and calls flow analysis, to understand deeper its behaviors. Along the talk, I will used multiple open source tools but mainly the one that I have developed and that is already available on Github (Octopus).

link / slides / video

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Talk @ Recon MTL 2018: Reverse Engineering Of Blockchain Smart Contracts

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RECON Montreal 2018

Many platforms using blockchain technology have emerged in 2017 and take the top 10 position of the cryptocurrencies’s MarketCap. One of the main reasons behind is the possibility to create decentralized applications (dapps) by writing Smart Contracts.

During this presentation, we will analyze the implementation of smart contract mechanism (Virtual Machine, assembly language, instructions sets, …) used by those platforms. We will analyze the assembly languages and instructions sets used by the Virtual Machine of the major blockchain platforms.

We will see how to disassemble and reconstruct the CFG (Control Flow Graph) of those smart contracts and the tools actually available to perform a deeper security analysis.

This talk aims at covering the following platforms:

link / slides / video (not yet)