Sigma rule: Insecure Transfer Via Curl.EXE

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-f6768d187734, updated 2023-06-30T00:00:00.000Z.

Rule

Title
Insecure Transfer Via Curl.EXE
Status
test
Level
medium
Author
X__Junior (Nextron Systems)
Date
2023-06-30
File
rules/windows/process_creation/proc_creation_win_curl_insecure_connection.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects execution of "curl.exe" with the "--insecure" flag.

Log source

product
windows
category
process_creation

Detection

selection_img:
    - Image|endswith: '\curl.exe'
    - OriginalFileName: 'curl.exe'
selection_cli:
    - CommandLine|re: '\s-k\s'
    - CommandLine|contains: '--insecure'
condition: all of selection_*

False positives (as the rule lists them)

  • Access to badly maintained internal or development systems

Tags

  • attack.execution

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_curl_insecure_connection.yml

Sources and licences

  • SigmaHQ

    "Insecure Transfer Via Curl.EXE" by X__Junior (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_curl_insecure_connection.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Insecure Transfer Via Curl.EXE",
entity page, dataset version ref-f6768d187734, updated 2023-06-30T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/cb9cc1d1-e84e-4bdc-b7ad-c31b1b7908ec (accessed 2026-11-03).
Underlying source: SigmaHQ rule cb9cc1d1-e84e-4bdc-b7ad-c31b1b7908ec, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.