Capabilities of File Integrity Monitoring

You can configure File Integrity Monitoring (FIM) rules in the Threat Stack Cloud Security PlatformⓇ (CSP). Testing your FIM rules allows you to verify that your system is properly configured.

Example of FIM Commands and Alerts

The Threat Stack CSP allows for the following actions to be monitored on any given file path:

  • Creation
  • Opening
  • Modifying
  • Closing
  • Deleting

Important

The Threat Stack Agent depends on inotify to populate FIM events. Due to inotify limitations, Threat Stack cannot provide information about the user that triggers a FIM Create, Delete, or Move event. For more information, please see FAQ: Exceptions for FIM Create, Delete, and Move Events.

How do I test the FIM rules?

You can test FIM by performing the above actions (examples below) on files within monitored directories. If you need help understanding which directories Threat Stack monitors, refer to the Overview of File Integrity Monitoring article.

Note

This is a limited list of commands to give you an idea of ways to test FIM within Threat Stack.

Command Line Explanation Example event Types
vi [filename] Opens the file with the vi text editor ‘access’, ‘open’, and ‘close’
echo [enter text] > secret file Takes texts and add it to the end of a file ‘modify’, ‘close’, ‘write’ and ‘open’ event
wget Downloads a file from the internet ‘modify’, ‘open’, ‘close’, and ‘write’ event
curl Downloads a file from the internet ‘modify’, ‘open’, ‘close’, and ‘write’ event
scp outsidehost:/file secretfile Copies a file from an outside host to your system ‘open’, ‘modify’, ‘close’, and ‘write’ event
scp secretfile outsidehost:/file Takes a file from your system and copies it to an outside host ‘open’, ‘access’, and ‘close’ event

Example

Running the “vi” command to trigger an event and alert.

  1. Choose a file that should be monitored within Threat Stack
  2. Navigate to that file’s directory
  3. Type ‘vi [filename]’
  4. Result: File opens in vi
  5. To exit vi enter “:q”

Note

FIM events can take up to a minute to display within the Threat Stack system.

Where can I view my results?

  1. Go to the Alerts tab on the left hand side.
  2. Select the Sev 3 tab to display Severity 3 alerts.

Result: You should see an alert for the event that you triggered.

vi_triggered_alert.png

What if I don’t see an alert for the event?

Check out the FIM Troubleshooting Guide or contact support.

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