Sophos Central Endpoint and SEC: Computers fail/hang on boot after the Microsoft Windows April 9, 2019 update. Please follow knowledge base article 133945
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As malware continues to evolve, the methods used to detect previously unknown threats has to evolve as well. A ML/PE-A detection is generated by Sophos Intercept X’s Machine Learning (ML) engine, also referred to by the specific Sophos approach Deep Learning and is designed to detect malicious Portable Executable (PE) files such as:
If a detection of this type occurs, it is because Sophos has detected a file on the endpoint that our Deep Learning threat model has decided as malicious. This is a pre-execution detection meaning the file was detected before it was able to be run, stopping any further malicious activity from occurring.
For more information on how Deep Learning makes these decisions please see Demystifying deep learning: how Sophos builds machine learning models
The following sections are covered:
Applies to the following Sophos products Sophos Intercept X
In most cases there is nothing to do, the detected file and related components will have already been automatically removed from the endpoint. If more information on what led up to the detection is needed, use the Root Cause Analysis feature in the Sophos Central to see what is happening on the endpoint at that time.
Deep learning, as well as being an advanced way of stopping unknown malware, does come with a chance of detecting a non-malicious (clean) file as malicious which is also known as a False Positive. Sophos has included protections in Deep Learning to reduce the chance of this occurring as well as routinely reviewing our threat model and adjusting it to increase correct detection and reduce incorrect ones.
In order to help customers mitigate false positives, you have the ability to resolves these detection within the product itself. In the Sophos Central, an administrator will have the option to allow ML/PE-A detection that he believes to be incorrect. Doing so will restore the file and related components and stop it from being detected again in the environment.
Note: Only allow detections if you are sure it is safe to do so. To help understand if something is safe or not please see: How to investigate and resolve a potential False Positive / Incorrect Detection
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