Potential Credential Access via DuplicateHandle in LSASS

edit

Potential Credential Access via DuplicateHandle in LSASS

edit

Identifies suspicious access to an LSASS handle via DuplicateHandle from an unknown call trace module. This may indicate an attempt to bypass the NtOpenProcess API to evade detection and dump LSASS memory for credential access.

Rule type: eql

Rule indices:

  • winlogbeat-*
  • logs-windows.*

Severity: medium

Risk score: 47

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: Credential Access
  • Data Source: Sysmon Only

Version: 207

Rule authors:

  • Elastic

Rule license: Elastic License v2

Rule query

edit
process where host.os.type == "windows" and event.code == "10" and

 /* LSASS requesting DuplicateHandle access right to another process */
 process.name : "lsass.exe" and winlog.event_data.GrantedAccess == "0x40" and

 /* call is coming from an unknown executable region */
 winlog.event_data.CallTrace : "*UNKNOWN*"

Framework: MITRE ATT&CKTM