Insecure Proxy/DOH Transfer Via Curl.EXE

calendar Jul 31, 2023 · attack.execution  ·
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Detects execution of "curl.exe" with the "insecure" flag over proxy or DOH.

Sigma rule (View on GitHub)

 1title: Insecure Proxy/DOH Transfer Via Curl.EXE
 2id: 2c1486f5-02e8-4f86-9099-b97f2da4ed77
 3status: experimental
 4description: Detects execution of "curl.exe" with the "insecure" flag over proxy or DOH.
 5references:
 6    - https://curl.se/docs/manpage.html
 7author: Nasreddine Bencherchali (Nextron Systems)
 8date: 2023/07/27
 9tags:
10    - attack.execution
11logsource:
12    product: windows
13    category: process_creation
14detection:
15    selection_img:
16        - Image|endswith: '\curl.exe'
17        - OriginalFileName: 'curl.exe'
18    selection_cli:
19        CommandLine|contains:
20            - '--doh-insecure'
21            - '--proxy-insecure'
22    condition: all of selection_*
23falsepositives:
24    - Access to badly maintained internal or development systems
25level: 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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