sigmamediumHunting

SMB Spoolss Name Piped Usage

Detects the use of the spoolss named pipe over SMB. This can be used to trigger the authentication via NTLM of any machine that has the spoolservice enabled.

MITRE ATT&CK

T1021.002

lateral-movement

Detection Query

selection:
  path|endswith: IPC$
  name: spoolss
condition: selection

Author

OTR (Open Threat Research), @neu5ron

Created

2018-11-28

Data Sources

zeeksmb_files

Platforms

zeek

References

Tags

attack.lateral-movementattack.t1021.002

Raw Content

title: SMB Spoolss Name Piped Usage
id: bae2865c-5565-470d-b505-9496c87d0c30
status: test
description: Detects the use of the spoolss named pipe over SMB. This can be used to trigger the authentication via NTLM of any machine that has the spoolservice enabled.
references:
    - https://posts.specterops.io/hunting-in-active-directory-unconstrained-delegation-forests-trusts-71f2b33688e1
    - https://dirkjanm.io/a-different-way-of-abusing-zerologon/
    - https://twitter.com/_dirkjan/status/1309214379003588608
author: OTR (Open Threat Research), @neu5ron
date: 2018-11-28
modified: 2022-10-09
tags:
    - attack.lateral-movement
    - attack.t1021.002
logsource:
    product: zeek
    service: smb_files
detection:
    selection:
        path|endswith: 'IPC$'
        name: spoolss
    condition: selection
falsepositives:
    - Domain Controllers that are sometimes, commonly although should not be, acting as printer servers too
level: medium