Sigma rule: Suspicious LDAP-Attributes Used

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-377c58cd35c6, updated 2022-10-05T00:00:00.000Z.

Rule

Title
Suspicious LDAP-Attributes Used
Status
test
Level
high
Author
xknow @xknow_infosec
Date
2019-03-24
Modified
2022-10-05
File
rules/windows/builtin/security/win_security_susp_ldap_dataexchange.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects the usage of particular AttributeLDAPDisplayNames, which are known for data exchange via LDAP by the tool LDAPFragger and are additionally not commonly used in companies.

Log source

product
windows
service
security
definition
The "Audit Directory Service Changes" logging policy must be configured in order to receive events. Audit events are generated only for objects with configured system access control lists (SACLs). Audit events are generated only for objects with configured system access control lists (SACLs) and only when accessed in a manner that matches their SACL settings. This policy covers the following events ids - 5136, 5137, 5138, 5139, 5141. Note that the default policy does not cover User objects. For that a custom AuditRule need to be setup (See https://github.com/OTRF/Set-AuditRule)

Detection

selection:
    EventID: 5136
    AttributeValue|contains: '*'
    AttributeLDAPDisplayName:
        - 'primaryInternationalISDNNumber'
        - 'otherFacsimileTelephoneNumber'
        - 'primaryTelexNumber'
condition: selection

False positives (as the rule lists them)

  • Companies, who may use these default LDAP-Attributes for personal information

Tags

  • attack.t1001.003
  • attack.command-and-control

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/builtin/security/win_security_susp_ldap_dataexchange.yml

Sources and licences

  • SigmaHQ

    "Suspicious LDAP-Attributes Used" by xknow @xknow_infosec (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_susp_ldap_dataexchange.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 LDAP-Attributes Used",
entity page, dataset version ref-377c58cd35c6, updated 2022-10-05T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/d00a9a72-2c09-4459-ad03-5e0a23351e36 (accessed 2026-11-03).
Underlying source: SigmaHQ rule d00a9a72-2c09-4459-ad03-5e0a23351e36, 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.