[metadata]
creation_date = "2023/09/27"
integration = ["endpoint"]
maturity = "production"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2023/09/27"

[rule]
author = ["Elastic"]
description = """
Identifies an unsigned Windows Background Intelligent Transfer Service (BITS) client process. Attackers may abuse BITS
functionality to download or upload data using the BITS service.
"""
references = [
  "https://web.archive.org/web/20230531215706/https://blog.menasec.net/2021/05/hunting-for-suspicious-usage-of.html",
  "https://www.elastic.co/blog/hunting-for-persistence-using-elastic-security-part-2"
]
from = "now-119m"
interval = "60m"
index = ["logs-endpoint.events.*"]
language = "eql"
license = "Elastic License v2"
name = "Unsigned BITS Service Client Process"
risk_score = 21
rule_id = "9a3884d0-282d-45ea-86ce-b9c81100f026"
severity = "low"
tags = ["Domain: Endpoint", "OS: Windows", "Use Case: Threat Detection", "Tactic: Defense Evasion", "Rule Type: BBR", "Data Source: Elastic Defend"]
timestamp_override = "event.ingested"
building_block_type = "default"
type = "eql"

query = '''
library where dll.name : "Bitsproxy.dll" and process.executable != null and
not process.code_signature.trusted == true
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1197"
name = "BITS Jobs"
reference = "https://attack.mitre.org/techniques/T1197/"

[[rule.threat.technique]]
id = "T1036"
name = "Masquerading"
reference = "https://attack.mitre.org/techniques/T1036/"

[[rule.threat.technique.subtechnique]]
id = "T1036.001"
name = "Invalid Code Signature"
reference = "https://attack.mitre.org/techniques/T1036/001/"


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