Sigma rule: Download From Suspicious TLD - Whitelist

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-1551fc70c35f, updated 2023-05-18T00:00:00.000Z.

Rule

Title
Download From Suspicious TLD - Whitelist
Status
test
Level
low
Author
Florian Roth (Nextron Systems)
Date
2017-03-13
Modified
2023-05-18
File
rules/web/proxy_generic/proxy_download_susp_tlds_whitelist.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects executable downloads from suspicious remote systems

Log source

category
proxy

Detection

selection:
    c-uri-extension:
        - 'exe'
        - 'vbs'
        - 'bat'
        - 'rar'
        - 'ps1'
        - 'doc'
        - 'docm'
        - 'xls'
        - 'xlsm'
        - 'pptm'
        - 'rtf'
        - 'hta'
        - 'dll'
        - 'ws'
        - 'wsf'
        - 'sct'
        - 'zip'
        # If you want to add more extensions - see https://docs.google.com/spreadsheets/d/1TWS238xacAto-fLKh1n5uTsdijWdCEsGIM0Y0Hvmc5g/
filter:
    cs-host|endswith:
        - '.com'
        - '.org'
        - '.net'
        - '.edu'
        - '.gov'
        - '.uk'
        - '.ca'
        - '.de'
        - '.jp'
        - '.fr'
        - '.au'
        - '.us'
        - '.ch'
        - '.it'
        - '.nl'
        - '.se'
        - '.no'
        - '.es'
        # Extend this list as needed
condition: selection and not filter

False positives (as the rule lists them)

  • All kind of software downloads

Tags

  • attack.initial-access
  • attack.t1566
  • attack.execution
  • attack.t1203
  • attack.t1204.002

MITRE ATT&CK ids this rule names

Related rules

References

  • Internal Research

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

Sources and licences

  • SigmaHQ

    "Download From Suspicious TLD - Whitelist" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/web/proxy_generic/proxy_download_susp_tlds_whitelist.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: Download From Suspicious TLD - Whitelist",
entity page, dataset version ref-1551fc70c35f, updated 2023-05-18T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/b5de2919-b74a-4805-91a7-5049accbaefe (accessed 2026-11-03).
Underlying source: SigmaHQ rule b5de2919-b74a-4805-91a7-5049accbaefe, 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.