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Potential Credential Access via DuplicateHandle in LSASS

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Potential Credential Access via DuplicateHandle in LSASS

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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: 5 minutes

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:

Elastic
Host
Windows
Threat Detection
Credential Access

Version: 5 (version history)

Added (Elastic Stack release): 7.16.0

Last modified (Elastic Stack release): 8.4.0

Rule authors: Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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process where 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*"

Threat mapping

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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/

Rule version history

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Version 5 (8.4.0 release)

Updated query, changed from:

process where 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*"

Version 3 (8.2.0 release)

Formatting only

Version 2 (8.0.0 release)

Formatting only

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