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Credential theft is one of the most common ways attackers get into business systems. It rarely starts with someone “hacking the firewall”. More often, it starts with a stolen username and password, then the attacker logs in like a normal user. This matters for UK SMEs because stolen logins often look like routine activity. If nobody spots the signs, an attacker can quietly read emails, access files, change payment details, or set up forwarding rules that keep the breach going

Behaviour‑based detection is often mentioned and rarely explained. Many teams still think security tools only block known viruses. Modern attacks slip past signature checks by using stolen passwords, living‑off‑the‑land tools and quiet data exfiltration. This guide explains, in plain English, how AI spots unusual behaviour early enough to prevent a breach. What Is Behaviour‑Based Detection and How Does It Work? Behaviour‑based detection looks for actions that do not fit norma