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Suspicious LSASS Access via MalSecLogon

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Suspicious LSASS Access via MalSecLogon

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Identifies suspicious access to LSASS handle from a call trace pointing to seclogon.dll and with a suspicious access rights value. This may indicate an attempt to leak an LSASS handle via abusing the Secondary Logon service in preparation for credential access.

Rule type: eql

Rule indices:

winlogbeat-*
logs-windows.*

Severity: high

Risk score: 73

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://splintercod3.blogspot.com/p/the-hidden-side-of-seclogon-part-3.html

Tags:

Elastic
Host
Windows
Threat Detection
Credential Access Added (Elastic Stack release): 8.4.0

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 winlog.event_data.TargetImage :
"?:\\WINDOWS\\system32\\lsass.exe" and /* seclogon service
accessing lsass */ winlog.event_data.CallTrace : "*seclogon.dll*"
and process.name : "svchost.exe" and /* PROCESS_CREATE_PROCESS &
PROCESS_DUP_HANDLE & PROCESS_QUERY_INFORMATION */
winlog.event_data.GrantedAccess == "0x14c0"

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/

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