The service is running,
I'm using the two test examples from the Maltrail readme:
nslookup morphed.ru.
ping 136.161.101.53
Neither gets picked up.
OPNsense 21.7.1
Maltrail V1.8
I too had issues with maltrail sensor.py was running out of memory, it seems to be working now.
This is what I did to fix it:
1. I set a maximum memory size for the sensor using admin ui
2. I also upgraded from github maltrail and replaced everything but the config.
I think the first step could have been the fix, just setting the limit, but the latest version has also newer rules and code changes.