Sigma rule: File Download Via Curl.EXE

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-55c60648a190, updated 2023-02-21T00:00:00.000Z.

Rule

Title
File Download Via Curl.EXE
Status
test
Level
medium
Author
Florian Roth (Nextron Systems)
Date
2022-07-05
Modified
2023-02-21
File
rules-threat-hunting/windows/process_creation/proc_creation_win_curl_download.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects file download using curl.exe

Log source

product
windows
category
process_creation

Detection

selection_img:
    - Image|endswith: '\curl.exe'
    - Product: 'The curl executable'
selection_remote:
    CommandLine|contains:
        - ' -O'  # covers the alias for --remote-name and --output
        - '--remote-name'
        - '--output'
condition: all of selection_*

False positives (as the rule lists them)

  • Scripts created by developers and admins
  • Administrative activity
  • The "\Git\usr\bin\sh.exe" process uses the "--output" flag to download a specific file in the temp directory with the pattern "gfw-httpget-xxxxxxxx.txt "

Tags

  • attack.command-and-control
  • attack.t1105
  • detection.threat-hunting

MITRE ATT&CK ids this rule names

Related rules

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-threat-hunting/windows/process_creation/proc_creation_win_curl_download.yml

Sources and licences

  • SigmaHQ

    "File Download Via Curl.EXE" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-threat-hunting/windows/process_creation/proc_creation_win_curl_download.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: File Download Via Curl.EXE",
entity page, dataset version ref-55c60648a190, updated 2023-02-21T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/9a517fca-4ba3-4629-9278-a68694697b81 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 9a517fca-4ba3-4629-9278-a68694697b81, 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.