Sigma rule: Suspicious Download from Office Domain

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-c4b875ba1cb7, updated 2022-08-02T00:00:00.000Z.

Rule

Title
Suspicious Download from Office Domain
Status
test
Level
high
Author
Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
Date
2021-12-27
Modified
2022-08-02
File
rules/windows/process_creation/proc_creation_win_susp_download_office_domain.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects suspicious ways to download files from Microsoft domains that are used to store attachments in Emails or OneNote documents

Log source

product
windows
category
process_creation

Detection

selection_download:
    - Image|endswith:
          - '\curl.exe'
          - '\wget.exe'
    - CommandLine|contains:
          - 'Invoke-WebRequest'
          - 'iwr '
          - 'curl '
          - 'wget '
          - 'Start-BitsTransfer'
          - '.DownloadFile('
          - '.DownloadString('
selection_domains:
    CommandLine|contains:
        - 'https://attachment.outlook.live.net/owa/'
        - 'https://onenoteonlinesync.onenote.com/onenoteonlinesync/'
condition: all of selection_*

False positives (as the rule lists them)

  • Scripts or tools that download attachments from these domains (OneNote, Outlook 365)

Tags

  • attack.command-and-control
  • attack.resource-development
  • attack.t1105
  • attack.t1608

MITRE ATT&CK ids this rule names

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_susp_download_office_domain.yml

Sources and licences

  • SigmaHQ

    "Suspicious Download from Office Domain" by Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_susp_download_office_domain.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: Suspicious Download from Office Domain",
entity page, dataset version ref-c4b875ba1cb7, updated 2022-08-02T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/00d49ed5-4491-4271-a8db-650a4ef6f8c1 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 00d49ed5-4491-4271-a8db-650a4ef6f8c1, 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.