IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

« PowerShell Kerberos Ticket Request Potential Local NTLM Relay via HTTP »

› ›

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:

https://github.com/CCob/MirrorDump

Tags:

Domain: Endpoint
OS: Windows
Use Case: Threat Detection
Tactic: Credential Access
Data Source: Sysmon Only

Version: 104

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

edit

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&CK^TM

Tactic:
- Name: Credential Access
- ID: TA0006
- Reference URL: https://attack.mitre.org/tactics/TA0006/
Technique:
- Name: OS Credential Dumping
- ID: T1003
- Reference URL: https://attack.mitre.org/techniques/T1003/
Sub-technique:
- Name: LSASS Memory
- ID: T1003.001
- Reference URL: https://attack.mitre.org/techniques/T1003/001/

« PowerShell Kerberos Ticket Request Potential Local NTLM Relay via HTTP »