[metadata]
creation_date = "2023/07/14"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "Multiple field support in the New Terms rule type was added in Elastic 8.6"
min_stack_version = "8.6.0"
updated_date = "2023/09/19"
bypass_bbr_timing = true

[rule]
author = ["Elastic"]
building_block_type = "default"
description = """
This rule identifies the execution of unsigned executables via service control manager (SCM). Adversaries may abuse SCM
to execute malware or escalate privileges.
"""
from = "now-9m"
index = ["logs-endpoint.events.*"]
language = "kuery"
license = "Elastic License v2"
name = "Execution of an Unsigned Service"
risk_score = 21
rule_id = "56fdfcf1-ca7c-4fd9-951d-e215ee26e404"
severity = "low"
tags = ["Domain: Endpoint",
        "OS: Windows",
        "Use Case: Threat Detection",
        "Tactic: Execution",
        "Rule Type: BBR",
        "Data Source: Elastic Defend"
        ]
timestamp_override = "event.ingested"
type = "new_terms"

query = '''
host.os.type:windows and event.category:process and event.type:start and 
process.parent.executable:"C:\\Windows\\System32\\services.exe" and 
(process.code_signature.exists:false or process.code_signature.trusted:false)
'''

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

[[rule.threat.technique]]
id = "T1569"
name = "System Services"
reference = "https://attack.mitre.org/techniques/T1569/"

[[rule.threat.technique.subtechnique]]
id = "T1569.002"
name = "Service Execution"
reference = "https://attack.mitre.org/techniques/T1569/002/"

[rule.threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"

[rule.new_terms]
field = "new_terms_fields"
value = ["host.id", "process.executable", "user.id"]

[[rule.new_terms.history_window_start]]
field = "history_window_start"
value = "now-14d"