Suspicious Image Load (taskschd.dll) from MS Officeedit

Identifies a suspicious image load (taskschd.dll) from Microsoft Office processes. This behavior may indicate adversarial activity where a scheduled task is configured via Windows Component Object Model (COM). This technique can be used to configure persistence and evade monitoring by avoiding the usage of the traditional Windows binary (schtasks.exe) used to manage scheduled tasks.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-endpoint.events.*

Severity: low

Risk score: 21

Runs every: 5 minutes

Searches indices from: now-6m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Execution

Version: 2 (version history)

Added (Elastic Stack release): 7.11.0

Last modified (Elastic Stack release): 7.11.2

Rule authors: Elastic

Rule license: Elastic License

Rule queryedit

library where process.name in ("WINWORD.EXE", "EXCEL.EXE",
"POWERPNT.EXE", "MSPUB.EXE", "MSACCESS.EXE") and event.action ==
"load" and event.category == "library" and file.name ==
"taskschd.dll"

Threat mappingedit

Framework: MITRE ATT&CKTM

Rule version historyedit

Version 2 (7.11.2 release)
  • Formatting only