Potential PrintNightmare File Modification

Detects the creation or modification of a print driver with an unusual file name. This may indicate attempts to exploit privilege escalation vulnerabilities related to the Print Spooler service. For more information refer to CVE-2021-34527 and verify that the impacted system is investigated.

Rule type: eql

Rule indices:

winlogbeat-*
logs-endpoint.events.*
logs-windows.*

Severity: high

Risk score: 73

Runs every: 5 minutes

Searches indices from: now-9m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Elastic
Host
Windows
Threat Detection
Privilege Escalation

Version: 1

Added (Elastic Stack release): 7.14.0

Rule authors: Elastic

Rule license: Elastic License v2

Rule query

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/* This rule is compatible with both Sysmon and Elastic Endpoint */
file where process.name : "spoolsv.exe" and file.name :
("kernelbase.dll", "ntdll.dll", "kernel32.dll", "winhttp.dll",
"user32.dll") and file.path :
"?:\\Windows\\System32\\spool\\drivers\\x64\\3\\*"

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Privilege Escalation
- ID: TA0004
- Reference URL: https://attack.mitre.org/tactics/TA0004/
Technique:
- Name: Exploitation for Privilege Escalation
- ID: T1068
- Reference URL: https://attack.mitre.org/techniques/T1068/

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