Attempt to Clear Kernel Ring Buffer via Dmesg

[rule]
description = """
Monitors for the deletion of the kernel ring buffer events through dmesg. Attackers may clear kernel ring buffer events
to evade detection after installing a Linux kernel module (LKM). This activity is commonly observed by intrusions that
leverage kernel-level rootkits to maintain persistence on a compromised host.
"""
id = "116d477e-8dd3-4de6-bbfd-9c19ca37fb8b"
license = "Elastic License v2"
name = "Attempt to Clear Kernel Ring Buffer via Dmesg"
os_list = ["linux"]
version = "1.0.2"

query = '''
process where event.type == "start" and event.action == "exec" and
process.name == "dmesg" and process.args in ("-c", "-C", "--clear", "--read-clear") and
not process.parent.executable == "/tmp/newroot/usr/bin/sudo"
'''

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

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

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1070"
name = "Indicator Removal"
reference = "https://attack.mitre.org/techniques/T1070/"
[[threat.technique.subtechnique]]
id = "T1070.002"
name = "Clear Linux or Mac System Logs"
reference = "https://attack.mitre.org/techniques/T1070/002/"


[[threat.technique]]
id = "T1562"
name = "Impair Defenses"
reference = "https://attack.mitre.org/techniques/T1562/"
[[threat.technique.subtechnique]]
id = "T1562.001"
name = "Disable or Modify Tools"
reference = "https://attack.mitre.org/techniques/T1562/001/"



[threat.tactic]
id = "TA0005"
name = "Defense Evasion"
reference = "https://attack.mitre.org/tactics/TA0005/"

[internal]
min_endpoint_version = "7.15.0"