« Suspicious Print Spooler SPL File Created Suspicious Proc Pseudo File System Enumeration »
Elastic Docs ›Elastic Security Solution [8.14] ›Detections and alerts ›Prebuilt rule reference

Suspicious PrintSpooler Service Executable File Creation

edit

Suspicious PrintSpooler Service Executable File Creationedit

Detects attempts to exploit privilege escalation vulnerabilities related to the Print Spooler service. For more information refer to the following CVE’s - CVE-2020-1048, CVE-2020-1337 and CVE-2020-1300 and verify that the impacted system is patched.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-endpoint.events.file-*
  • logs-windows.sysmon_operational-*
  • endgame-*

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: 108

Rule authors:

  • Elastic

Rule license: Elastic License v2

Setupedit

Setup

If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2, events will not define event.ingested and default fallback for EQL rules was not added until version 8.2. Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate event.ingested to @timestamp. For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html

Rule queryedit

file where host.os.type == "windows" and event.type == "creation" and
  process.name : "spoolsv.exe" and file.extension : "dll" and
  file.path : ("?:\\Windows\\System32\\*", "?:\\Windows\\SysWOW64\\*") and
  not file.path : (
    "?:\\WINDOWS\\SysWOW64\\PrintConfig.dll",
    "?:\\WINDOWS\\system32\\x5lrs.dll",
    "?:\\WINDOWS\\sysWOW64\\x5lrs.dll",
    "?:\\WINDOWS\\system32\\PrintConfig.dll",
    "?:\\WINDOWS\\system32\\spool\\DRIVERS\\x64\\*.dll",
    "?:\\WINDOWS\\system32\\spool\\DRIVERS\\W32X86\\*.dll",
    "?:\\WINDOWS\\system32\\spool\\PRTPROCS\\x64\\*.dll",
    "?:\\WINDOWS\\system32\\spool\\{????????-????-????-????-????????????}\\*.dll"
  )

Framework: MITRE ATT&CKTM

« Suspicious Print Spooler SPL File Created Suspicious Proc Pseudo File System Enumeration »