Suspicious Curl Change User Agents - Linux

calendar Oct 17, 2023 · attack.command_and_control attack.t1071.001  ·
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Detects a suspicious curl process start on linux with set useragent options

Sigma rule (View on GitHub)

 1title: Suspicious Curl Change User Agents - Linux
 2id: b86d356d-6093-443d-971c-9b07db583c68
 3related:
 4    - id: 3286d37a-00fd-41c2-a624-a672dcd34e60
 5      type: derived
 6status: test
 7description: Detects a suspicious curl process start on linux with set useragent options
 8references:
 9    - https://curl.se/docs/manpage.html
10author: Nasreddine Bencherchali (Nextron Systems)
11date: 2022/09/15
12tags:
13    - attack.command_and_control
14    - attack.t1071.001
15logsource:
16    category: process_creation
17    product: linux
18detection:
19    selection:
20        Image|endswith: '/curl'
21        CommandLine|contains:
22            - ' -A '
23            - ' --user-agent '
24    condition: selection
25falsepositives:
26    - Scripts created by developers and admins
27    - Administrative activity
28level: medium

References

  • curl - How To Use

    Options Keep Expanded Bottom right handle resizes. --abstract-unix-socket --alt-svc --anyauth -a, --append --aws-sigv4 --basic --ca-native --cacert --capath -E, --cert --cert-status --cert-type --c...


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