FireWalker: A New Approach to Generically Bypass User-Space EDR Hooking


During red team engagements, it is not uncommon to encounter Endpoint Defence & Response (EDR) / Prevention (EDP) products that implement user-land hooks to gain insight in to a process’ behaviour and monitor for potentially malicious code. Some great work has been done in bypassing these checks in the past, including from our friends at Outflank who demonstrated this using direct system calls (recommended reading, HT to @Cneelis). However, in this blog post we will illustrate a new, generic approach for circumventing user-land EDR hooks.

Read more…