Can a hacker on our network steal data from all our computers and servers?

From many of them, if the network lets them. Once inside, an attacker can reach every system the compromised machine can reach and log in wherever its stored or stolen passwords work. Shared folders, a file server that everyone can read and one administrator password used on every computer make that list long. Three things shorten it: segments that keep workstations away from servers they do not need, accounts with the fewest rights that still let people work, and multi-factor authentication (MFA) on remote access and administrator logins. Stolen data also has to cross the network twice: once when the attacker gathers files from other hosts, and again when they send them out. NetSenX flags new host-to-host sessions and unusual outbound data volume per host, on every plan, Free included.

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