sequence by host.id with maxspan=5s
[network where event.type == "start" and host.os.type == "linux" and
event.action in ("connection_attempted", "connection_accepted") and
process.name : ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish", "socat") and destination.ip != null and
not cidrmatch(destination.ip, "127.0.0.0/8", "169.254.0.0/16", "224.0.0.0/4", "::1")] by process.entity_id
[process where event.type == "start" and host.os.type == "linux" and event.action in ("exec", "fork") and
process.name in ("bash", "dash", "sh", "tcsh", "csh", "zsh", "ksh", "fish") and (
(process.args : ("-i", "-l")) or (process.parent.name == "socat" and process.parent.args : "*exec*")
)] by process.parent.entity_id
Install detection rules in Elastic Security
Detect Potential Reverse Shell in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(opens in a new tab or window).