Elastic Security Detection Rules

Potential Credential Access via Renamed COM+ Services DLL

Last updated 9 months ago on 2025-03-20
Created 4 years ago on 2021-10-17

About

Identifies suspicious renamed COMSVCS.DLL Image Load, which exports the MiniDump function that can be used to dump a process memory. This may indicate an attempt to dump LSASS memory while bypassing command-line based detection in preparation for credential access.
Tags
Domain: EndpointOS: WindowsUse Case: Threat DetectionTactic: Credential AccessTactic: Defense EvasionData Source: SysmonLanguage: eql
Severity
high
Risk Score
73
MITRE ATT&CK™

Credential Access (TA0006)(external, opens in a new tab or window)

↳ OS Credential Dumping (T1003)(external, opens in a new tab or window)

Defense Evasion (TA0005)(external, opens in a new tab or window)

↳ System Binary Proxy Execution (T1218)(external, opens in a new tab or window)

License
Elastic License v2(external, opens in a new tab or window)

Definition

Rule Type
Event Correlation Rule
Integration Pack
Prebuilt Security Detection Rules
Index Patterns
winlogbeat-*logs-windows.sysmon_operational-*
Related Integrations

windows(external, opens in a new tab or window)

Query
text code block:
sequence by process.entity_id with maxspan=1m
 [process where host.os.type == "windows" and event.category == "process" and
    process.name : "rundll32.exe"]
 [process where host.os.type == "windows" and event.category == "process" and event.dataset : "windows.sysmon_operational" and event.code == "7" and
   (file.pe.original_file_name : "COMSVCS.DLL" or file.pe.imphash : "EADBCCBB324829ACB5F2BBE87E5549A8") and
    /* renamed COMSVCS */
    not file.name : "COMSVCS.DLL"]

Install detection rules in Elastic Security

Detect Potential Credential Access via Renamed COM+ Services DLL in the Elastic Security detection engine by installing this rule into your Elastic Stack.

To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).