Potential DLL Side-Loading via Microsoft Antimalware Service Executable
Elastic Stack Serverless Security
Identifies a Windows trusted program that is known to be vulnerable to DLL Search Order Hijacking starting after being renamed or from a non-standard path. This is uncommon behavior and may indicate an attempt to evade defenses via side-loading a malicious DLL within the memory space of one of those processes.
Rule type: eql
Rule indices:
- winlogbeat-*
- logs-endpoint.events.*
- logs-windows.*
Severity: high
Risk score: 73
Runs every: 5m
Searches indices from: now-9m (https://www.elastic.co/guide/en/elasticsearch/reference/current/common-options.html#date-math[Date Math format], see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Host
- Windows
- Threat Detection
- Defense Evasion
Version: 2
Rule authors:
- Elastic
- Dennis Perto
Rule license: Elastic License v2
process where event.type == "start" and
(process.pe.original_file_name == "MsMpEng.exe" and not process.name : "MsMpEng.exe") or
(process.name : "MsMpEng.exe" and not
process.executable : ("?:\\ProgramData\\Microsoft\\Windows Defender\\*.exe",
"?:\\Program Files\\Windows Defender\\*.exe",
"?:\\Program Files (x86)\\Windows Defender\\*.exe",
"?:\\Program Files\\Microsoft Security Client\\*.exe",
"?:\\Program Files (x86)\\Microsoft Security Client\\*.exe"))
Framework: MITRE ATT&CKTM
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Hijack Execution Flow
- ID: T1574
- Reference URL: https://attack.mitre.org/techniques/T1574/
Sub-technique:
- Name: DLL Side-Loading
- ID: T1574.002
- Reference URL: https://attack.mitre.org/techniques/T1574/002/