file where host.os.type == "linux" and event.action in ("rename", "creation") and
process.executable != null and (
(file.path like~ (
"/lib/security/*", "/lib64/security/*", "/usr/lib/security/*", "/usr/lib64/security/*",
"/lib/x86_64-linux-gnu/security/*", "/usr/lib/x86_64-linux-gnu/security/*"
) and file.extension == "so") or
(file.path like~ "/etc/pam.d/*" and file.extension == null) or
(file.path like~ "/etc/security/pam_*" or file.path == "/etc/pam.conf")
) 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", "/dev/fd/*", "/usr/bin/pamac-daemon",
"/bin/pamac-daemon", "/usr/lib/snapd/snapd", "/usr/local/bin/dockerd", "/usr/sbin/pam-auth-update",
"/usr/lib/systemd/systemd", "/usr/libexec/packagekitd", "/usr/bin/bsdtar", "/sbin/pam-auth-update"
) or
file.path like (
"/tmp/snap.rootfs_*/pam_*.so", "/tmp/newroot/lib/*/pam_*.so", "/tmp/newroot/usr/lib64/security/pam_*.so"
) 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/*", "/snap/*", "/dev/fd/*", "/usr/lib/virtualbox/*"
) or
(process.name == "sed" and file.name like~ "sed*") or
(process.name == "perl" and file.name like~ "e2scrub_all.tmp*")
)
Install detection rules in Elastic Security
Detect Creation or Modification of Pluggable Authentication Module or Configuration 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).