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pavlichenko wrote (edited )

To detect if something phones home or connects to the internet, you could run a packet capture, on your computer, or on your router, or on some other device on your network that can see your traffic. Wireshark and tcpdump are packet analysers. What is your operating system and network setup?

To block the outgoing traffic from leaving your computer, you could use a firewall running on your computer. Two libre options are iptables and ufw. ufw is probably easier to set up.

If all else fails, disconnect your computer from the internet.