Nasreddine Bencherchali
598d29f811
chore: change tags, date, modified fields to comply with v2 of the Sigma spec. chore: update the related type from `obsoletes` to `obsolete`. chore: update local json schema to the latest version.
26 lines
730 B
YAML
26 lines
730 B
YAML
title: HTTP Request With Empty User Agent
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id: 21e44d78-95e7-421b-a464-ffd8395659c4
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status: test
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description: |
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Detects a potentially suspicious empty user agent strings in proxy log.
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Could potentially indicate an uncommon request method.
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references:
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- https://twitter.com/Carlos_Perez/status/883455096645931008
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author: Florian Roth (Nextron Systems)
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date: 2017-07-08
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modified: 2021-11-27
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tags:
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- attack.defense-evasion
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- attack.command-and-control
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- attack.t1071.001
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logsource:
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category: proxy
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detection:
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selection:
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# Empty string - as used by Powershell's (New-Object Net.WebClient).DownloadString
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c-useragent: ''
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condition: selection
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falsepositives:
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- Unknown
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level: medium
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