IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Suspicious Print Spooler File Deletion

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Suspicious Print Spooler File Deletion

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Detects deletion of print driver files by an unusual process. This may indicate a clean up attempt post successful privilege escalation via Print Spooler service related vulnerabilities.

Rule type: eql

Rule indices:

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

Severity: medium

Risk score: 47

Runs every: 5 minutes

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

Maximum alerts per execution: 100

References:

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-34527

Tags:

Elastic
Host
Windows
Threat Detection
Privilege Escalation

Version: 5 (version history)

Added (Elastic Stack release): 7.14.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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Uninstall or manual deletion of a legitimate printing driver files. Verify the printer file metadata such as manufacturer and signature information.

Investigation guide

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Rule query

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file where event.type : "deletion" and not process.name :
("spoolsv.exe", "dllhost.exe", "explorer.exe") and file.path :
"?:\\Windows\\System32\\spool\\drivers\\x64\\3\\*.dll"

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/

Rule version history

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Version 5 (8.4.0 release)

Formatting only

Version 3 (8.3.0 release)

Formatting only

Version 2 (8.2.0 release)

Formatting only

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