Hunting reverse shells: How the Sysdig Threat Research Team builds smarter detection rules

This Sysdig Threat Research Team article analyzes TCP-based reverse-shell techniques (direct shell execution with network-redirected I/O, indirect execution using a secondary process with IPC, and direct command execution with network-redirected I/O), details the relevant Linux syscalls and file-descriptor/IPC behaviors, and describes how Sysdig/Falco detection rules and stateful observation policies were evolved to improve detection and reduce false positives.