Glossary
What is account takeover?
Account takeover (ATO) is when an attacker gains unauthorized control of a legitimate user's account — email, banking, SaaS or social. Once in, they can steal data, send phishing as the victim, move money, or use the account as a launchpad for deeper attacks.
How accounts get taken over
ATO usually starts with stolen credentials — from phishing, a data breach, or credential stuffing — or by intercepting MFA codes. A compromised email account is especially dangerous because it can reset passwords for everything else.
From a trusted account, attackers can send convincing internal phishing, approve fraudulent payments, and quietly exfiltrate data.
Signs of account takeover
Watch for unexpected logins from new locations, changed recovery settings, mail rules that hide replies, and messages you didn't send. Fast detection limits the damage.
How to prevent account takeover
- Enable phishing-resistant MFA on critical accounts.
- Train people against the phishing that steals credentials.
- Monitor for leaked credentials and force resets when found.
- Alert on suspicious logins and new mail-forwarding rules.
How HookPhish helps
HookPhish attacks ATO from both sides: reducing the phishing that steals credentials, and monitoring the dark web and breach data so you reset exposed accounts before they're hijacked.
Frequently asked questions
What causes account takeover?+
Most ATO comes from stolen or reused credentials — via phishing, breaches or credential stuffing — sometimes combined with intercepting MFA codes.
Why is email account takeover so serious?+
A compromised email account can be used to reset passwords for many other services, making it a master key for the attacker.
How do I prevent account takeover?+
Use strong, phishing-resistant MFA, train against phishing, monitor for leaked credentials, and alert on suspicious logins and mailbox rule changes.
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