Suspicious Print Spooler Point and Print DLL

Detects attempts to exploit a privilege escalation vulnerability (CVE-2020-1030) related to the print spooler service. Exploitation involves chaining multiple primitives to load an arbitrary DLL into the print spooler process running as SYSTEM.

Rule type: eql

Rule indices:

logs-endpoint.events.registry-*
endgame-*
logs-windows.sysmon_operational-*
winlogbeat-*

Severity: high

Risk score: 73

Runs every: 5m

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

Maximum alerts per execution: 100

References:

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Privilege Escalation
Data Source: Elastic Endgame
Use Case: Vulnerability
Data Source: Elastic Defend
Data Source: Sysmon

Version: 107

Rule authors:

Elastic

Rule license: Elastic License v2

Rule query

edit

sequence by host.id with maxspan=30s
[registry where host.os.type == "windows" and
 registry.path : (
    "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Print\\Printers\\*\\SpoolDirectory",
    "\\REGISTRY\\MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Print\\Printers\\*\\SpoolDirectory"
    ) and
 registry.data.strings : "C:\\Windows\\System32\\spool\\drivers\\x64\\4"]
[registry where host.os.type == "windows" and
 registry.path : (
    "HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Print\\Printers\\*\\CopyFiles\\Payload\\Module",
    "\\REGISTRY\\MACHINE\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Print\\Printers\\*\\CopyFiles\\Payload\\Module"
    ) and
 registry.data.strings : "C:\\Windows\\System32\\spool\\drivers\\x64\\4\\*"]

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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