rules/proxy/proxy_empty_ua.yml

title: Empty User Agent
id: 21e44d78-95e7-421b-a464-ffd8395659c4
status: experimental
description: Detects suspicious empty user agent strings in proxy logs
references:
    - https://twitter.com/Carlos_Perez/status/883455096645931008
author: Florian Roth
date: 2017/07/08
logsource:
    category: proxy
detection:
    selection:
      # Empty string - as used by Powershell's (New-Object Net.WebClient).DownloadString
      c-useragent: ''
    condition: selection
fields:
    - ClientIP
    - c-uri
    - c-useragent
falsepositives:
    - Unknown
level: medium
User-Agent Rules 2017-07-08 08:37:44 -06:00			`title: Empty User Agent`
Added UUIDs to rules 2019-11-12 23:12:27 +01:00			`id: 21e44d78-95e7-421b-a464-ffd8395659c4`
User-Agent Rules 2017-07-08 08:37:44 -06:00			`status: experimental`
			`description: Detects suspicious empty user agent strings in proxy logs`
Change "reference" to "references" to match new schema 2018-01-28 02:12:19 +03:00			`references:`
User-Agent Rules 2017-07-08 08:37:44 -06:00			`- https://twitter.com/Carlos_Perez/status/883455096645931008`
			`author: Florian Roth`
fix: fixed missing date fields in proxy rules 2020-01-30 15:20:52 +01:00			`date: 2017/07/08`
User-Agent Rules 2017-07-08 08:37:44 -06:00			`logsource:`
Fixed rules 2017-09-11 00:35:52 +02:00			`category: proxy`
User-Agent Rules 2017-07-08 08:37:44 -06:00			`detection:`
			`selection:`
fix: fixed missing date fields in proxy rules 2020-01-30 15:20:52 +01:00			`# Empty string - as used by Powershell's (New-Object Net.WebClient).DownloadString`
Fixed proxy rule field names 2019-12-07 00:11:33 +01:00			`c-useragent: ''`
User-Agent Rules 2017-07-08 08:37:44 -06:00			`condition: selection`
Added field names to first rules 2017-09-12 23:54:04 +02:00			`fields:`
			`- ClientIP`
Fixed proxy rule field names 2019-12-07 00:11:33 +01:00			`- c-uri`
			`- c-useragent`
User-Agent Rules 2017-07-08 08:37:44 -06:00			`falsepositives:`
			`- Unknown`
			`level: medium`