Blogpost: Analysis of Google Keep WebAssembly module​

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2019/07/16 @ webassembly-security.com

Last month, i was at REcon Montreal to give my training about WebAssembly Security and after some discussion people always ask me this question:

Is WebAssembly already used in the wild?

The answer is of course YES and some WebAssembly modules are potentially running right now in your browser if you are using Google web services. Recently, Google was using WebAssembly for the beta version of Google Earth but also in production for services like Google Keep.

  1. Google Keep Wasm Module & JS File Extraction
  2. WebAssembly Module Reversing
  3. Extract Build Information
  4. What is Sketchology and Ink?
  5. Reversing Protobuf Encoded Blobs
  6. Extract WebGL Vertex Shader Structure
  7. Absolute path, Error messages, Mangling & Constant names
  8. Going Deeper & Conclusion

link, pdf

Blogpost: Ethereum Threat Actors Part 3 — Phishings/Scams using Smart Contracts

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2019/04/03 @ QuoScient Medium

In part three of our mini-series (see part #1 & part #2) describing how cybercrime actors are using the Ethereum blockchain for fraudulent means, we analyze a phishing tactic that used a smart contract address. Interestingly, this smart contract is not unique and the exact same closed-source bytecode is used in more than 130 thousand smart contracts.

  1. Phishing on Forums/Telegram.
  2. Quick analysis of the Smart contract Bytecode
  3. Who is behind 0xAf1931c20ee0c11BEA17A41BfBbAd299B2763bc0?
  4. Similar Luno user wallets Used for Phishing
  5. Conclusion
  6. Indicator of Compromise

link / pdf

Blogpost: Ethereum Threat Actors Part 2 — ClipboardWalletHijacker Malware Still Active.

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2019/02/18 @ QuoScient Medium

In part two of our mini-series (see part #1) describing how cybercrime actors are using the Ethereum blockchain for fraudulent means, we analyze a clipboard hijacker malware targeting Bitcoin and Ethereum users. This malware, renamed ClipboardWalletHijacker by Qihoo360 Security Center, was first discovered in June 2018, after having infected 300 thousand computers within a week.

  1. Quick ClipboardWalletHijacker Analysis
  2. Hijacked Ethereum Transactions
  3. Cryptocurrency Exchange Used by the Actor
  4. Packers & Variants
  5. Conclusion
  6. Indicator of Compromise

link / pdf

Blogpost: Ethereum Threat Actors Part 1 — DotNet Downloader using Ethereum Transactions for C&C updates.

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2019/02/04 @ QuoScient Medium

As part of our research into how cybercrime actors using the Ethereum blockchain for fraudulent means, we analyzed a DotNet downloader that retrieves the malicious payload from URLs stored inside Ethereum transactions. We analyzed the sample provided by a German Security Researcher, Karsten Hahn @struppigel in this tweet.

  1. Downloader analysis
  2. Main Function
  3. GetLastTransactionHashFromAddress function
  4. GetAdditionalDataFromTransaction function
  5. Transaction analysis
  6. C&C Update Pricing
  7. Blockcypher service
  8. Future of Ethereum botnet
  9. Conclusion
  10. Indicators of Compromise

link / pdf