You have an on-premises network. You have a Microsoft 365 E5 subscription that uses Microsoft Defender for Identity. From the Microsoft Defender portal, you investigate an incident on a device named…

Disabling User1 only addresses the compromised user but does not isolate the compromised device or address other potentially compromised credentials on that device.

Quarantining Device1 only isolates the device but does not address the compromised user account (User1) or other potentially compromised credentials on that device.

Resetting passwords for accounts on Device1 is important, but it doesn't immediately stop active use of the compromised User1 account or isolate the compromised device.

Disabling User1 and quarantining Device1 is a good start but omits the critical step of resetting passwords for all accounts signed into the compromised device, which is crucial for preventing further lateral movement via cached credentials.

A "pass-the-ticket" attack implies that an attacker has obtained a Kerberos ticket for User1, potentially gaining access to services as User1. To contain this, disabling User1 prevents further actions by the compromised account, quarantining Device1 isolates the compromised endpoint, and resetting passwords for all accounts that signed in to Device1 ensures that any cached credentials or other compromised accounts on that device are invalidated, preventing further lateral movement and effectively containing the threat with a comprehensive, yet targeted, response.