UID Change to 0 from Unusual Process Executable

[rule]
description = """
This rule detects a UID change event by an unusual process executable. Attackers may escalate privileges via an exploit
located in a temporary directory, such as /tmp, /dev/shm, or /var/tmp, triggering a UID change event to 0 (root).
"""
id = "68cf34b4-0751-457a-b8fd-55208cdb42fe"
license = "Elastic License v2"
name = "UID Change to 0 from Unusual Process Executable"
os_list = ["linux"]
version = "1.0.7"

query = '''
sequence by process.entity_id with maxspan=15s
[process where event.type == "start" and event.action == "exec" and user.id != 0]
[process where event.type == "change" and event.action == "uid_change" and user.id == 0 and
process.executable like ("/tmp/*", "/dev/shm/*", "/var/tmp/*") and process.parent.executable != null and
not (
  process.executable like (
    "/tmp/ubuntu-release-upgrader-*", "/tmp/go-build*", "/tmp/newroot/*", "/tmp/CVU_*", "/tmp/usr/bin/bwrap",
    "/tmp/varonis*", "/tmp/usr/sbin/sshd", "/tmp/baum/easybuild/*", "/tmp/.mount_cursor*", "/var/tmp/foreman-ssh-cmd*",
    "/tmp/tmp.*/nix-installer", "/var/tmp/buildah*"
    ) or
  process.working_directory like ("/var/lib/rundeck", "/usr/sap/tmp", "/oracle/*/jobscheduler_agent", "/var/tmp/one/im/kvm-probes.d") or
  process.parent.executable like ("/tmp/newroot/*", "/usr/lib/systemd/systemd", "/tmp/.criu.mntns*", "/usr/libexec/gnome-session-service")
)]
'''

min_endpoint_version = "7.15.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0

[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 1

[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 0

[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 1

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1068"
name = "Exploitation for Privilege Escalation"
reference = "https://attack.mitre.org/techniques/T1068/"


[threat.tactic]
id = "TA0004"
name = "Privilege Escalation"
reference = "https://attack.mitre.org/tactics/TA0004/"

[internal]
min_endpoint_version = "7.15.0"