Sigma rule: Failed Mounting of Hidden Share

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-cc534c8cb65d, updated 2023-02-24T00:00:00.000Z.

Rule

Title
Failed Mounting of Hidden Share
Status
unsupported
Level
medium
Author
Fabian Franz
Date
2022/08/30
Modified
2023/02/24
File
unsupported/windows/win_susp_failed_hidden_share_mount.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects repeated failed (outgoing) attempts to mount a hidden share

Log source

product
windows
service
smbclient-security

Detection

selection:
    EventID: 31010
    ShareName|endswith: '$'
timeframe: 1m
condition: selection | count() > 10

False positives (as the rule lists them)

  • Legitimate administrative activity
  • Faulty scripts

Tags

  • attack.t1021.002
  • attack.lateral_movement

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/unsupported/windows/win_susp_failed_hidden_share_mount.yml

Sources and licences

  • SigmaHQ

    "Failed Mounting of Hidden Share" by Fabian Franz (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/unsupported/windows/win_susp_failed_hidden_share_mount.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: Failed Mounting of Hidden Share",
entity page, dataset version ref-cc534c8cb65d, updated 2023-02-24T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/1c3be8c5-6171-41d3-b792-cab6f717fcdb (accessed 2026-11-03).
Underlying source: SigmaHQ rule 1c3be8c5-6171-41d3-b792-cab6f717fcdb, 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.