sigma-rules/rules/_deprecated/apm_null_user_agent.toml

[metadata]
creation_date = "2020/02/18"
maturity = "deprecated"
min_stack_comments = "New fields added: required_fields, related_integrations, setup"
min_stack_version = "8.3.0"
updated_date = "2022/09/13"
deprecation_date = "2022/09/13"

[rule]
author = ["Elastic"]
description = "A request to a web application server contained no identifying user agent string."
false_positives = [
    """
    Some normal applications and scripts may contain no user agent. Most legitimate web requests from the Internet
    contain a user agent string. Requests from web browsers almost always contain a user agent string. If the source is
    unexpected, the user unauthorized, or the request unusual, these may indicate suspicious or malicious activity.
    """,
]
index = ["apm-*-transaction*", "traces-apm*"]
language = "kuery"
license = "Elastic License v2"
name = "Web Application Suspicious Activity: No User Agent"
references = ["https://en.wikipedia.org/wiki/User_agent"]
risk_score = 47
rule_id = "43303fd4-4839-4e48-b2b2-803ab060758d"
severity = "medium"
tags = ["Elastic", "APM"]
timestamp_override = "event.ingested"
type = "query"

query = '''
url.path:*
'''


[[rule.filters]]

[rule.filters."$state"]
store = "appState"
[rule.filters.exists]
field = "user_agent.original"
[rule.filters.meta]
disabled = false
indexRefName = "kibanaSavedObjectMeta.searchSourceJSON.filter[0].meta.index"
key = "user_agent.original"
negate = true
type = "exists"
value = "exists"