IPS SSLBlacklists & Feodo Tracker¶
This tutorial explains how to setup the IPS system to drop SSL certificates listed on the abuse.ch SSL Blacklists & Feodo Tracker.
Feodo (also known as Cridex or Bugat) is a Trojan used to commit e-banking fraud and steal sensitive information from the victim’s computer, such as credit card details or credentials. For more information see https://feodotracker.abuse.ch
- Always upgrade to latest release first. See Initial Installation & Configuration and/or upgrade to latest release: System->Firmware: Fetch updates
- Minimum Advisable Memory is 2 Gigabyte and sufficient free disk space for logging (>10GB advisable).
- Disable all Hardware Offloading Under Interface-Settings
After applying you need to reboot OPNsense otherwise offloading may not completely be disabled and IPS mode will not function.
Some features described on this page were added in version 16.1.1. Always keep your system up to date.
Setup Intrusion Detection & Prevention¶
To enable IDS/IPS just go to Services->Intrusion Detection and select enabled & IPS mode. Make sure you have selected the right interface for the intrusion detection system too run on. For our example we will use the WAN interface, as that will most likely be you connection with the public Internet.
First apply the configuration by pressing the Apply button at the bottom of the form.
Fetch Rule sets¶
For this example we will only fetch the abuse.ch SSL & Dodo Tracker rulesets. To do so: select Enabled after each one.
To download the rule sets press Download & Update Rules.
Change default behavior¶
Now click on the info button right after each rule and change Input Filter from none to drop actions.
When done it should like this:
Apply fraud drop actions¶
Now press Download & Update Rules again to change the behavior to drop.
Keep up to date¶
Now schedule a regular fetch to keep your server up to date.
Click on schedule, a popup window will appear:
Select enabled and choose a time. For the example it is set to each day at 11:12. Select Save changes and wait until you have returned to the IDS screen.
Your system has now been fully setup to drop known fraudulent SSL certificates as well data phishing attempts by utilizing the Feodo tracking list.
Currently there is no test service available to check your block rules against, however here is a sample of an actual alert that has been blocked: