Account Takeover (ATO)
also: ATO, account hijacking
When a criminal gains unauthorized access to a victim's bank, brokerage, or email account and uses it to move funds or data.
Account takeover usually starts with stolen credentials from a data breach, phishing, or SIM swapping. Because the login is genuine, banks and platforms can be slow to flag it; attackers often change contact details first so the victim is locked out before the money moves.