Persistence (TA0003)(external, opens in a new tab or window)
Privilege Escalation (TA0004)(external, opens in a new tab or window)
text code block:file where host.os.type == "linux" and event.action in ("rename", "creation") and file.path like ( "/etc/cron.allow", "/etc/cron.deny", "/etc/cron.d/*", "/etc/cron.hourly/*", "/etc/cron.daily/*", "/etc/cron.weekly/*", "/etc/cron.monthly/*", "/etc/crontab", "/var/spool/cron/crontabs/*", "/var/spool/anacron/*" ) and not ( process.executable in ( "/bin/dpkg", "/usr/bin/dpkg", "/bin/dockerd", "/usr/bin/dockerd", "/usr/sbin/dockerd", "/bin/microdnf", "/usr/bin/microdnf", "/bin/rpm", "/usr/bin/rpm", "/bin/snapd", "/usr/bin/snapd", "/bin/yum", "/usr/bin/yum", "/bin/dnf", "/usr/bin/dnf", "/bin/podman", "/usr/bin/podman", "/bin/dnf-automatic", "/usr/bin/dnf-automatic", "/bin/pacman", "/usr/bin/pacman", "/usr/bin/dpkg-divert", "/bin/dpkg-divert", "/sbin/apk", "/usr/sbin/apk", "/usr/local/sbin/apk", "/usr/bin/apt", "/usr/sbin/pacman", "/bin/podman", "/usr/bin/podman", "/usr/bin/puppet", "/bin/puppet", "/opt/puppetlabs/puppet/bin/puppet", "/usr/bin/chef-client", "/bin/chef-client", "/bin/autossl_check", "/usr/bin/autossl_check", "/proc/self/exe", "/usr/bin/pamac-daemon", "/bin/pamac-daemon", "/usr/local/bin/dockerd", "/opt/elasticbeanstalk/bin/platform-engine", "/opt/puppetlabs/puppet/bin/ruby", "/usr/libexec/platform-python", "/opt/imunify360/venv/bin/python3", "/opt/eset/efs/lib/utild", "/usr/sbin/anacron", "/usr/bin/podman", "/kaniko/kaniko-executor", "/usr/bin/pvedaemon", "./usr/bin/podman", "/usr/lib/systemd/systemd", "./usr/bin/podman", "/usr/bin/coreutils", "/usr/sbin/univention-config-registry", "/usr/bin/dnf5", "./usr/lib/snapd/snap-update-ns" ) or file.path like ("/var/spool/cron/crontabs/tmp.*", "/etc/cron.d/jumpcloud-updater") or file.extension in ("swp", "swpx", "swx", "dpkg-remove") or file.Ext.original.extension == "dpkg-new" or process.executable like ( "/nix/store/*", "/var/lib/dpkg/*", "/tmp/vmis.*", "/snap/*", "/dev/fd/*", "/usr/libexec/platform-python*", "/var/lib/waagent/Microsoft*" ) or process.executable == null or process.name in ( "crond", "executor", "puppet", "droplet-agent.postinst", "cf-agent", "schedd", "imunify-notifier", "jumpcloud-agent", "crio", "dnf_install", "utild" ) or (process.name == "sed" and file.name like "sed*") or (process.name == "perl" and file.name like "e2scrub_all.tmp*") or (process.name in ("vi", "vim") and file.name like "*~") )
Install detection rules in Elastic Security
Detect Cron Job Created or 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(external, opens in a new tab or window).