Many files downloaded at once
What happened
One account downloaded an unusual number of files in a short time. It can be legitimate (a new laptop), or someone copying your data.
How serious
Serious: deal with it today.
Steps: Microsoft 365
Call the person (don't email: their mailbox may be in someone else's hands) and ask whether it was them.
If it wasn't them: block sign-in. Microsoft 365 admin center → Users → Active users → the person → Block sign-in.
Open the page:
admin.microsoft.com/#/users
Type the address yourself or use your bookmark: never follow a link in an unexpected email.Reset their password: Microsoft 365 admin center → Users → Active users → the person → Reset password. Give the new one by phone or in person.
Open the page:
admin.microsoft.com/#/users
Type the address yourself or use your bookmark: never follow a link in an unexpected email.Sign them out everywhere: Microsoft Entra admin center → Users → the person → Revoke sessions. This also logs out an attacker who copied their session.
Open the page:
entra.microsoft.com
Type the address yourself or use your bookmark: never follow a link in an unexpected email.Look at their recent sign-ins: Microsoft Entra admin center → Users → the person → Sign-in logs. Note countries and devices they don't recognise.
Open the page:
entra.microsoft.com
Type the address yourself or use your bookmark: never follow a link in an unexpected email.
Steps: Google Workspace
Call the person (don't email: their mailbox may be in someone else's hands) and ask whether it was them.
If it wasn't them: Google Admin console → Directory → Users → the person → Suspend user (or reset the password, next step).
Open the page:
admin.google.com/ac/users
Type the address yourself or use your bookmark: never follow a link in an unexpected email.Reset their password: Google Admin console → Directory → Users → the person → Reset password. Give the new one by phone or in person.
Open the page:
admin.google.com/ac/users
Type the address yourself or use your bookmark: never follow a link in an unexpected email.Sign them out everywhere: user page → Security → Sign-in cookies → Reset. This also ends a session an attacker copied.
Open the page:
admin.google.com/ac/users
Type the address yourself or use your bookmark: never follow a link in an unexpected email.Look at their recent sign-ins: Google Admin console → Reporting → Audit and investigation → User log events, filtered on the person.
Open the page:
admin.google.com/ac/reporting/audit/user_accounts
Type the address yourself or use your bookmark: never follow a link in an unexpected email.
How to check it’s fixed
Fixed when the person confirms the activity, or when the password is new, all sessions are signed out and no unknown method, rule or app is left. Ojava raises no new alert for them.
When to call your IT provider
Call your IT provider now if the person didn't do this, or if you are unsure.