Detection: Windows System Binary Proxy Execution MSIExec DLLRegisterServer
Description
The following analytic identifies the usage of msiexec.exe using the /y switch parameter, which grants the ability for msiexec to load DLLRegisterServer. Upon triage, review parent process and capture any artifacts for further review.
Annotations
No annotations available.
Implementation
To successfully implement this search, you need to be ingesting logs with the process name, parent process, and command-line executions from your endpoints. If you are using Sysmon, you must have at least version 6.0.4 of the Sysmon TA.
Known False Positives
This analytic will need to be tuned for your environment based on legitimate usage of msiexec.exe. Filter as needed.
Associated Analytic Story
Risk Based Analytics (RBA)
Risk Message | Risk Score | Impact | Confidence |
---|---|---|---|
An instance of spawning $process_name$ was identified on endpoint $dest_device_id$ by user $dest_user_id$ attempting to register a file. | 35 | 70 | 50 |
The Risk Score is calculated by the following formula: Risk Score = (Impact * Confidence/100). Initial Confidence and Impact is set by the analytic author.
References
Version: 4