sigmahighHunting

Suspicious LDAP-Attributes Used

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.

MITRE ATT&CK

T1001.003

command-and-control

Detection Query

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

Author

xknow @xknow_infosec

Created

2019-03-24

Data Sources

windowssecurity

Platforms

windows

References

Tags

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

Raw Content

title: Suspicious LDAP-Attributes Used
id: d00a9a72-2c09-4459-ad03-5e0a23351e36
status: test
description: 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.
references:
    - https://medium.com/@ivecodoe/detecting-ldapfragger-a-newly-released-cobalt-strike-beacon-using-ldap-for-c2-communication-c274a7f00961
    - https://blog.fox-it.com/2020/03/19/ldapfragger-command-and-control-over-ldap-attributes/
    - https://github.com/fox-it/LDAPFragger
author: xknow @xknow_infosec
date: 2019-03-24
modified: 2022-10-05
tags:
    - attack.t1001.003
    - attack.command-and-control
logsource:
    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
falsepositives:
    - Companies, who may use these default LDAP-Attributes for personal information
level: high