You are a Threat Hunter at a law firm that suffered a data breach where confidential documents were leaked. Using the Cyber Kill Chain framework, you trace the attacker's steps: they bypassed MFA by m

You are a Threat Hunter at a law firm that suffered a data breach where confidential documents were leaked. Using the Cyber Kill Chain framework, you trace the attacker’s steps: they bypassed MFA by masquerading as a legitimate user, moved laterally, accessed sensitive records from a shared repository, and exfiltrated data over an extended period. You must identify the Cyber Kill Chain phase at which the attack was identified, to strengthen defenses and detect intrusions before exfiltration occurs. At which phase was the attack identified?