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Description

The following analytic utilizes PowerShell Script Block Logging (EventCode=4104) to identify the [Adsisearcher] type accelerator being used to query Active Directory for domain computers. Red Teams and adversaries may leverage [Adsisearcher] to enumerate domain computers for situational awareness and Active Directory Discovery.

  • Type: TTP
  • Product: Splunk Enterprise, Splunk Enterprise Security, Splunk Cloud

  • Last Updated: 2021-09-01
  • Author: Mauricio Velazco, Splunk
  • ID: 70803451-0047-4e12-9d63-77fa7eb8649c

Annotations

ATT&CK
ID Technique Tactic
T1018 Remote System Discovery Discovery
Kill Chain Phase
  • Reconnaissance
NIST
CIS20
CVE
1
2
3
4
`powershell` EventCode=4104 (Message = "*[adsisearcher]*" AND Message = "*objectclass=computer*" AND Message = "*findAll()*") 
| stats count min(_time) as firstTime max(_time) as lastTime by EventCode Message ComputerName User 
| `security_content_ctime(firstTime)` 
| `remote_system_discovery_with_adsisearcher_filter`

Macros

The SPL above uses the following Macros:

Note that remote_system_discovery_with_adsisearcher_filter is a empty macro by default. It allows the user to filter out any results (false positives) without editing the SPL.

Required field

  • _time
  • EventCode
  • Message
  • ComputerName
  • User

How To Implement

To successfully implement this analytic, you will need to enable PowerShell Script Block Logging on some or all endpoints. Additional setup here https://docs.splunk.com/Documentation/UBA/5.0.4.1/GetDataIn/AddPowerShell#Configure_module_logging_for_PowerShell.

Known False Positives

Administrators or power users may use Adsisearcher for troubleshooting.

Associated Analytic story

RBA

Risk Score Impact Confidence Message
15.0 30 50 Remote system discovery enumeration on $dest$ by $user$

Reference

Test Dataset

Replay any dataset to Splunk Enterprise by using our replay.py tool or the UI. Alternatively you can replay a dataset into a Splunk Attack Range

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