Adversaries may establish persistence and/or elevate privileges using system mechanisms that trigger execution based on specific events. Various operating systems have means to monitor and subscribe to events such as logons or other user activity such as running specific applications/binaries. Cloud environments may also support various functions and services that monitor and can be invoked in response to specific cloud events.(Citation: Backdooring an AWS account)(Citation: Varonis Power Automate Data Exfiltration)(Citation: Microsoft DART Case Report 001)
Adversaries may abuse these mechanisms as a means of maintaining persistent access to a victim via repeatedly executing malicious code. After gaining access to a victim system, adversaries may create/modify event triggers to point to malicious content that will be executed whenever the event trigger is invoked.(Citation: FireEye WMI 2015)(Citation: Malware Persistence on OS X)(Citation: amnesia malware)
Since the execution can be proxied by an account with higher permissions, such as SYSTEM or service accounts, an adversary may be able to abuse these triggered execution mechanisms to escalate their privileges.
View in MITRE ATT&CK®| Capability ID | Capability Description | Mapping Type | ATT&CK ID | ATT&CK Name | Notes |
|---|---|---|---|---|---|
| CIS-7.7 | Remediate Detected Vulnerabilities | mitigates | T1546 | Event Triggered Execution |
Comments
Remediation can remove specific vulnerable event-triggered execution mechanisms, including known AppInit DLL and Application Shimming behaviors. Most event-triggered persistence also depends on configuration and permissions.
References
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| CIS-7.3 | Perform Automated Operating System Patch Management | mitigates | T1546 | Event Triggered Execution |
Comments
OS patches that address specific Windows event-triggered execution mechanisms, particularly Application Shimming.
References
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| Capability ID | Capability Description | Mapping Type | ATT&CK ID | ATT&CK Name | Notes |
|---|---|---|---|---|---|
| google_secops | Google Security Operations | technique_scores | T1546 | Event Triggered Execution |
Comments
Google Security Ops is able to trigger an alert based on manipulation of default programs.
This technique was scored as minimal based on low or uncertain detection coverage factor.
https://github.com/chronicle/detection-rules/blob/783e0e5947774785db1c55041b70176deeca6f46/mitre_attack/T1546_001_windows_change_default_file_association.yaral
References
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