Autocolor Linux Backdoor Artifacts

Daniel Jeremiah@daniyyell

•updated Mar 30, 2026•3•0•29

This rule detects artifacts associated with the Auto-Color Linux backdoor. Specifically, it looks for the presence of the malicious library 'libcext.so.2', which mimics a legitimate library, or modifications to '/etc/ld.preload' for persistence and dynamic linker hijacking. It also identifies specific file paths used by the malware, such as '/var/log/cross/auto-color' or files within '/tmp/cross/' with a 'config-err-' prefix.