sigma-rules/rules_building_block/discovery_linux_system_owner_user_discovery.toml

[metadata]
creation_date = "2023/07/10"
integration = ["endpoint", "sentinel_one_cloud_funnel"]
maturity = "production"
updated_date = "2025/12/24"

[rule]
author = ["Elastic"]
building_block_type = "default"
description = """
Identifies the use of built-in tools which adversaries may use to enumerate the system owner/user of a compromised
system.
"""
from = "now-119m"
index = ["logs-endpoint.events.*", "endgame-*", "logs-sentinel_one_cloud_funnel.*",]
interval = "60m"
language = "kuery"
license = "Elastic License v2"
name = "System Owner/User Discovery Linux"
risk_score = 21
rule_id = "bf8c007c-7dee-4842-8e9a-ee534c09d205"
severity = "low"
tags = [
  "Domain: Endpoint",
  "OS: Linux",
  "Use Case: Threat Detection",
  "Tactic: Discovery",
  "Rule Type: BBR",
  "Data Source: Elastic Defend",
  "Data Source: Elastic Endgame",
  "Data Source: SentinelOne",
]
timestamp_override = "event.ingested"
type = "new_terms"
query = '''
event.category:process and host.os.type:linux and event.type:start and event.action:(exec or exec_event or start) and
process.name:("whoami" or "w" or "who" or "users" or "id" or "groups")
'''

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

[[rule.threat.technique]]
id = "T1033"
name = "System Owner/User Discovery"
reference = "https://attack.mitre.org/techniques/T1033/"

[[rule.threat.technique]]
id = "T1069"
name = "Permission Groups Discovery"
reference = "https://attack.mitre.org/techniques/T1069/"

[rule.threat.tactic]
id = "TA0007"
name = "Discovery"
reference = "https://attack.mitre.org/tactics/TA0007/"

[rule.new_terms]
field = "new_terms_fields"
value = ["process.parent.executable", "process.command_line", "agent.id"]

[[rule.new_terms.history_window_start]]
field = "history_window_start"
value = "now-5d"