NullSessionPipe Registry Modification

Elastic Stack Serverless Security

Identifies NullSessionPipe registry modifications that specify which pipes can be accessed anonymously. This could be indicative of adversary lateral movement preparation by making the added pipe available to everyone.

Rule type: eql

Rule indices:

• logs-endpoint.events.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)

Maximum alerts per execution: 100

References:

• https://www.welivesecurity.com/2019/05/29/turla-powershell-usage/
• https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/network-access-restrict-anonymous-access-to-named-pipes-and-shares

Tags:

• Elastic
• Host
• Windows
• Threat Detection
• Lateral Movement

Version: 101

Rule authors:

• Elastic

Rule license: Elastic License v2

registry where event.type in ("creation", "change") and
registry.path : "HKLM\\SYSTEM\\*ControlSet*\\services\\LanmanServer\\Parameters\\NullSessionPipes" and
length(registry.data.strings) > 0

Framework: MITRE ATT&CKTM

• Tactic:

  • Name: Lateral Movement
  • ID: TA0008
  • Reference URL: https://attack.mitre.org/tactics/TA0008/

• Technique:

  • Name: Remote Services
  • ID: T1021
  • Reference URL: https://attack.mitre.org/techniques/T1021/

• Sub-technique:

  • Name: SMB/Windows Admin Shares
  • ID: T1021.002
  • Reference URL: https://attack.mitre.org/techniques/T1021/002/