Decrypting and Abusing Predefined BIOCs in Palo Alto Cortex XDR

Original text by Manuel

Summary

The Windows Cortex XDR agent uses CLIPS rules for behavioral detections. These rules are shipped encrypted in content updates. We decrypted these rules and discovered numerous hardcoded exceptions including global whitelists that can be abused to bypass those rules. For example, if a process’s command-line arguments contain :Windowsccmcache, it is…

https://core-jmp.org/2026/03/decrypting-and-abusing-predefined-biocs-in-palo-alto-cortex-xdr/