DEFEATING STRING OBFUSCATION IN OBFUSCATED NODEJS MALWARE USING AST

Summary from the TLDR InfoSec newsletter

This article describes how to defeat string obfuscation in Node.js malware through Abstract Syntax Tree (AST) parsing, focusing on the Nebula Stealer sample. It outlines a method using the Babel library to safely analyze, extract, and execute obfuscated code in a VM context while replacing obfuscated strings with their decoded values. The author includes code snippets for renaming variables, extracting code segments, executing parts of the code to reveal hidden strings, and enhancing readability.