In this blogpost, I will first explain the WebAssembly binary format and its sections. Then, I’ll demonstrate how to create a valid polyglot wasm module that contain an html/js payload embedded using 2 different techniques. Finally, I’ll give you the link to the github repository if you want to try on your own and learn more about WebAssembly
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.
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.
Phishing on Forums/Telegram.
Quick analysis of the Smart contract Bytecode
Who is behind 0xAf1931c20ee0c11BEA17A41BfBbAd299B2763bc0?
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.
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.