sigma-rules/rules/linux/persistence_linux_group_creation.toml

[metadata]
creation_date = "2023/02/13"
integration = ["system"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/06/22"

[rule]
author = ["Elastic"]
description = """
Identifies attempts to create a new group. Attackers may create new groups to establish persistence on a system.
"""
from = "now-9m"
index = ["logs-system.auth-*"]
language = "eql"
license = "Elastic License v2"
name = "Linux Group Creation"
risk_score = 21
rule_id = "a1c2589e-0c8c-4ca8-9eb6-f83c4bbdbe8f"
severity = "low"
tags = ["Domain: Endpoint", "OS: Linux", "Use Case: Threat Detection", "Tactic: Persistence"]
timestamp_override = "event.ingested"
type = "eql"
query = '''
iam where host.os.type == "linux" and (event.type == "group" and event.type == "creation") and
process.name in ("groupadd", "addgroup") and group.name != null
'''

[[rule.threat]]
framework = "MITRE ATT&CK"

[[rule.threat.technique]]
id = "T1136"
name = "Create Account"
reference = "https://attack.mitre.org/techniques/T1136/"

[[rule.threat.technique.subtechnique]]
id = "T1136.001"
name = "Local Account"
reference = "https://attack.mitre.org/techniques/T1136/001/"

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