How do we stop an attacker who is already in our network?

By containing first and then removing, in one coordinated move. Find out as much as you can quietly: which hosts and accounts are involved, how the attacker gets in and out, and where their tools are. Then act together: isolate the affected hosts at the switch or firewall, block their outside destinations, disable or reset the compromised accounts from a clean device, and close the way in, such as a VPN account or an exposed service. Acting piecemeal warns the attacker, who may switch hosts or start damaging systems. Bring in an incident-response firm if you have not already, and keep a log. After containment, rebuild affected machines and watch closely for weeks. NetSenX does not remove attackers; it shows from the network which hosts are involved and where they connect, which is what a containment plan needs, and it flags renewed activity afterwards.

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