Sigma rule: Microsoft Teams Sensitive File Access By Uncommon Applications

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-186cb759f550, updated 2024-07-22T00:00:00.000Z.

Rule

Title
Microsoft Teams Sensitive File Access By Uncommon Applications
Status
test
Level
medium
Author
@SerkinValery
Date
2024-07-22
File
rules/windows/file/file_access/file_access_win_teams_sensitive_files.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects file access attempts to sensitive Microsoft teams files (leveldb, cookies) by an uncommon process.

Log source

product
windows
category
file_access
definition
Requirements: Microsoft-Windows-Kernel-File ETW provider

Detection

selection:
    FileName|contains:
        - '\Microsoft\Teams\Cookies'
        - '\Microsoft\Teams\Local Storage\leveldb'
filter_main_legit_location:
    # Note: its best to filter the full path to avoid false negatives
    Image|endswith: '\Microsoft\Teams\current\Teams.exe'
condition: selection and not 1 of filter_main_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.credential-access
  • attack.t1528

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/file/file_access/file_access_win_teams_sensitive_files.yml

Sources and licences

  • SigmaHQ

    "Microsoft Teams Sensitive File Access By Uncommon Applications" by @SerkinValery (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/file/file_access/file_access_win_teams_sensitive_files.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: Microsoft Teams Sensitive File Access By Uncommon Applications",
entity page, dataset version ref-186cb759f550, updated 2024-07-22T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/65744385-8541-44a6-8630-ffc824d7d4cc (accessed 2026-11-03).
Underlying source: SigmaHQ rule 65744385-8541-44a6-8630-ffc824d7d4cc, 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.