[metadata]
creation_date = "2020/04/24"
ecs_version = ["1.4.0"]
maturity = "production"
updated_date = "2020/04/24"

[rule]
author = ["Elastic"]
description = """
Kernel modules are pieces of code that can be loaded and unloaded into the kernel upon demand. They extend the
functionality of the kernel without the need to reboot the system. This rule identifies attempts to remove a kernel
module.
"""
false_positives = [
    """
    There is usually no reason to remove modules, but some buggy modules require it. These can be exempted by username.
    Note that some Linux distributions are not built to support the removal of modules at all.
    """,
]
index = ["auditbeat-*"]
language = "kuery"
license = "Elastic License"
name = "Kernel Module Removal"
references = ["http://man7.org/linux/man-pages/man8/modprobe.8.html"]
risk_score = 73
rule_id = "cd66a5af-e34b-4bb0-8931-57d0a043f2ef"
severity = "high"
tags = ["Elastic", "Linux"]
type = "query"

query = '''
event.action:executed and process.args:(rmmod and sudo or modprobe and sudo and ("--remove" or "-r"))
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1089"
name = "Disabling Security Tools"
reference = "https://attack.mitre.org/techniques/T1089/"


[rule.threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"
[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1215"
name = "Kernel Modules and Extensions"
reference = "https://attack.mitre.org/techniques/T1215/"


[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"