sigmahighHunting

Suspicious NTLM Authentication on the Printer Spooler Service

Detects a privilege elevation attempt by coercing NTLM authentication on the Printer Spooler service

MITRE ATT&CK

privilege-escalationcredential-access

Detection Query

selection_img:
  - Image|endswith: \rundll32.exe
  - OriginalFileName: RUNDLL32.EXE
selection_cli:
  CommandLine|contains|all:
    - C:\windows\system32\davclnt.dll,DavSetCookie
    - http
  CommandLine|contains:
    - spoolss
    - srvsvc
    - /print/pipe/
condition: all of selection_*

Author

Elastic (idea), Tobias Michalski (Nextron Systems)

Created

2022-05-04

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.privilege-escalationattack.credential-accessattack.t1212

Raw Content

title: Suspicious NTLM Authentication on the Printer Spooler Service
id: bb76d96b-821c-47cf-944b-7ce377864492
status: test
description: Detects a privilege elevation attempt by coercing NTLM authentication on the Printer Spooler service
references:
    - https://twitter.com/med0x2e/status/1520402518685200384
    - https://github.com/elastic/detection-rules/blob/dd224fb3f81d0b4bf8593c5f02a029d647ba2b2d/rules/windows/credential_access_relay_ntlm_auth_via_http_spoolss.toml
author: Elastic (idea), Tobias Michalski (Nextron Systems)
date: 2022-05-04
modified: 2023-02-09
tags:
    - attack.privilege-escalation
    - attack.credential-access
    - attack.t1212
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\rundll32.exe'
        - OriginalFileName: 'RUNDLL32.EXE'
    selection_cli:
        CommandLine|contains|all:
            - 'C:\windows\system32\davclnt.dll,DavSetCookie'
            - 'http'
        CommandLine|contains:
            - 'spoolss'
            - 'srvsvc'
            - '/print/pipe/'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high