Web Application Suspicious Activity: No User Agent
editWeb Application Suspicious Activity: No User Agent
editA request to a web application server contained no identifying user agent string.
Rule type: query
Rule indices:
- apm--transaction
Severity: medium
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-6m (Date Math format, see also Additional look-back time
)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- APM
Version: 4 (version history)
Added (Elastic Stack release): 7.6.0
Last modified (Elastic Stack release): 7.10.0
Rule authors: Elastic
Rule license: Elastic License
Potential false positives
editSome 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.
Rule query
editurl.path:*
Rule filters
edit{ "$state": { "store": "appState" }, "exists": { "field": "user_agent.original" }, "meta": { "disabled": false, "indexRefName": "kibanaSavedObjectMeta.searchSourceJSON.filter[0].meta.index", "key": "user_agent.original", "negate": true, "type": "exists", "value": "exists" } }
Rule version history
edit- Version 4 (7.10.0 release)
-
- Formatting only
- Version 3 (7.9.0 release)
-
- Formatting only
- Version 2 (7.7.0 release)
-
-
Updated query, changed from:
url.path: *
-