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 PrintSpooler SPL File Created Suspicious Process Access via Direct System Call »

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.*
  • 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: 5 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 8.2.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guideedit

## Config

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 8.2, so you will need to add a custom pipeline to populate `event.ingested` to @timestamp for this rule to work.

Rule queryedit

file where event.type != "deletion" and process.name : "spoolsv.exe"
and file.extension : ("exe", "dll") and not file.path :
("?:\\Windows\\System32\\spool\\*", "?:\\Windows\\Temp\\*",
"?:\\Users\\*")

Threat mappingedit

Framework: MITRE ATT&CKTM

Rule version historyedit

Version 5 (8.2.0 release)
  • Formatting only
Version 4 (7.13.0 release)

  • Updated query, changed from:

    event.category:file and not event.type:deletion and
process.name:spoolsv.exe and file.extension:(exe or dll) and not
file.path:(C\:\\Windows\\System32\\spool\\* or C\:\\Windows\\Temp\\*
or C\:\\Users\\*)
Version 3 (7.12.0 release)
  • Formatting only
Version 2 (7.11.2 release)
  • Formatting only
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