detection icon

Short bio

MachineLearning/Anomalous.100% is Malwarebytes’ generic detection name for files that are flagged by Malwarebytes’ Machine Learning module as 100% anomalous. You may also see lower percentages in your scan results. The percentage is used to show how big the deviation from the examined file is from the legitimate files in the training set. Where a percentage of 100% means they look completely dissimilar from our training set of legitimate files.


Malwarebytes detects these files to protect customers from zero-day malware.


If you recognize the detected file as legitimate, please let us know so we can whitelist the file. If you are not sure, keep the file in quarantine. When we receive a copy through our telemetry we will investigate and give it a detection name that tells you more about what it is exactly.

To report a possible False Positive Please register at our forum.

Once registered Go here: False Positives

Please read before reporting a false positive

Your topic will be reviewed and replied to.

Add an exclusion

Should users wish to keep this program and exclude it from being detected in future scans, they can add the program to the exclusions list. Here’s how to do it.

  • Open Malwarebytes for Windows.
  • Click the Detection History
  • Click the Allow List
  • To add an item to the Allow List, click Add.
  • Select the exclusion type Allow a file or folder and use the Select a folder button to select the main folder for the software that you wish to keep.
  • Repeat this for any secondary files or folder(s) that belong to the software.

If you want to allow the program to connect to the Internet, for example to fetch updates, also add an exclusion of the type Allow an application to connect to the internet and use the Browse button to select the file you wish to grant access.