Potential Local Privilege Escalation via Unshare

[rule]
description = """
Identifies an attempt to exploit a local privilege escalation via the unshare command. The unshare command allows a
process to create a new namespace and set the capabilities of the process. This can be used to escalate privileges to
root.
"""
id = "f483675e-1c8f-4ce4-80b3-34c646911385"
license = "Elastic License v2"
name = "Potential Local Privilege Escalation via Unshare"
os_list = ["linux"]
version = "1.0.1"

query = '''
sequence by process.parent.entity_id with maxspan=60s
  [process where event.action == "exec" and event.type == "start" and 
  process.name == "unshare" and process.args in ("-r", "-rm", "-m", "-U", "--user") and user.id != 0]
  [process where event.action == "uid_change" and event.type == "change" and user.id == 0 and process.parent.user.id != 0]
'''

min_endpoint_version = "8.2.0"
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 = "8.2.0"