any where
/* file events for creation; file change events are not captured by some of the included sources for linux and so may
miss this, which is the purpose of the process + command line args logic below */
(
event.category == "file" and event.type in ("change", "creation") and
file.path : ("/private/etc/hosts", "/etc/hosts", "?:\\Windows\\System32\\drivers\\etc\\hosts") and
not process.name in ("dockerd", "rootlesskit", "podman", "crio")
)
or
/* process events for change targeting linux only */
(
event.category == "process" and event.type in ("start") and
process.name in ("nano", "vim", "vi", "emacs", "echo", "sed") and
process.args : ("/etc/hosts") and
not process.parent.name in ("dhclient-script", "google_set_hostname")
)
Install detection rules in Elastic Security
Detect Hosts File Modified 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).