Untrusted DLL Loaded by Azure AD Sync Service
editUntrusted DLL Loaded by Azure AD Sync Service
editIdentifies the load of a DLL without a valid code signature by the Azure AD Sync process, which may indicate an attempt to persist or collect sensitive credentials passing through the Azure AD synchronization server.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.library*
- 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: Elastic Defend
- Data Source: Sysmon
Version: 101
Rule authors:
- Elastic
- Matteo Potito Giorgio
Rule license: Elastic License v2
Rule query
editany where host.os.type == "windows" and process.name : "AzureADConnectAuthenticationAgentService.exe" and ( (event.category == "library" and event.action == "load") or (event.category == "process" and event.action : "Image loaded*") ) and not (?dll.code_signature.trusted == true or file.code_signature.status == "Valid") and not ( /* Elastic defend DLL path */ ?dll.path : ("?:\\Windows\\assembly\\NativeImages*", "?:\\Windows\\Microsoft.NET\\*", "?:\\Windows\\WinSxS\\*", "?:\\Windows\\System32\\DriverStore\\FileRepository\\*") or /* Sysmon DLL path is mapped to file.path */ file.path : ("?:\\Windows\\assembly\\NativeImages*", "?:\\Windows\\Microsoft.NET\\*", "?:\\Windows\\WinSxS\\*", "?:\\Windows\\System32\\DriverStore\\FileRepository\\*") )
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/