Potential Credential Access via LSASS Memory Dump

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Potential Credential Access via LSASS Memory Dumpedit

Identifies suspicious access to LSASS handle from a call trace pointing to DBGHelp.dll or DBGCore.dll, which both export the MiniDumpWriteDump method that can be used to dump LSASS memory content in preperation for credential access.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-windows.*

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:

  • Elastic
  • Host
  • Windows
  • Threat Detection
  • Credential Access

Version: 1

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule queryedit

process where event.code == "10" and
  winlog.event_data.TargetImage : "?:\\WINDOWS\\system32\\lsass.exe" and

   /* DLLs exporting MiniDumpWriteDump API to create an lsass mdmp*/
  winlog.event_data.CallTrace : ("*dbhelp*", "*dbgcore*") and

   /* case of lsass crashing */
  not process.executable : ("?:\\Windows\\System32\\WerFault.exe", "?:\\Windows\\System32\\WerFaultSecure.exe")

Framework: MITRE ATT&CKTM