Suspicious LSASS Access via MalSecLogon
editSuspicious LSASS Access via MalSecLogon
editIdentifies 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.sysmon_operational-*
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:
- Domain: Endpoint
- OS: Windows
- Use Case: Threat Detection
- Tactic: Credential Access
- Data Source: Sysmon
Version: 208
Rule authors:
- Elastic
Rule license: Elastic License v2
Setup
editSetup
If enabling an EQL rule on a non-elastic-agent index (such as beats) for versions <8.2,
events will not define event.ingested
and default fallback for EQL rules was not added until version 8.2.
Hence for this rule to work effectively, users will need to add a custom ingest pipeline to populate
event.ingested
to @timestamp.
For more details on adding a custom ingest pipeline refer - https://www.elastic.co/guide/en/fleet/current/data-streams-pipeline-tutorial.html
Rule query
editprocess where host.os.type == "windows" and 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"
Framework: MITRE ATT&CKTM
-
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/