sigma-rules/rules/linux/persistence_insmod_kernel_module_load.toml

[metadata]
creation_date = "2022/07/11"
maturity = "production"
updated_date = "2022/08/17"

[rule]
author = ["Elastic"]
description = """
Detects the use of the insmod binary to load a Linux kernel object file. Threat actors can use this binary, given they have root privileges, to load a rootkit on a system providing them with complete control and the ability to hide from security products. Manually loading a kernel module in this manner should not be at all common and can indicate suspcious or malicious behavior. 
"""
from = "now-9m"
index = ["logs-*"]
language = "eql"
license = "Elastic License v2"
name = "Kernel module load via insmod"
references = [
    "https://decoded.avast.io/davidalvarez/linux-threat-hunting-syslogk-a-kernel-rootkit-found-under-development-in-the-wild/"
]
risk_score = 47
rule_id = "2339f03c-f53f-40fa-834b-40c5983fc41f"
severity = "medium"
tags = ["Elastic", "Host", "Linux", "Threat Detection", "Persistence", "Rootkit"]
timestamp_override = "event.ingested"
type = "eql"

query = '''
process where event.type == "start" and process.executable : "/usr/sbin/insmod" and process.args : "*.ko"
'''

[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1547"
name = "Boot or Logon Autostart Execution"
reference = "https://attack.mitre.org/techniques/T1547/"

[[rule.threat.technique.subtechnique]]
id = "T1547.006"
name = "Kernel Modules and Extensions"
reference = "https://attack.mitre.org/techniques/T1547/006/"

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