Creating YARA Rules Based on Code

This blog post demonstrates how to create YARA hex-string rules to detect the Echelon .NET stealer (SHA256 b52d4177277851b95c5cdf08bf2e3261c7ac80af449da00741c83bcf6c181d67). It explains hexadecimal strings, wildcards and jumps, inspecting MSIL with dnSpy, and provides example hex signatures and a sample YARA rule while warning the rule is based on a single sample and not production-ready.