Account takeover: what to do in the first hour

The short answer: Account recovery becomes harder when an attacker controls the inbox used to reset everything else. Prioritisation matters more than changing every password at random.

Protect the accounts that control recovery first

The useful move is to separate what the claimant controls from evidence you can obtain independently. Names, logos, caller ID, screenshots and a polished page can all be copied. A saved telephone number, a typed official address, a known colleague or a protected transaction route changes the channel instead of merely inspecting the same claim again.

Risk also depends on consequence. Reading a public page is different from granting remote access, sending an identity document or approving an irreversible payment. As the cost of error rises, require stronger verification and prefer a step you can undo.

Warning signals to assess together

These clues become useful when they form a pattern. Treat each one as a prompt to verify, not as a verdict by itself.

• Password-reset messages you did not request

  Pair this observation with a separate check: Secure the primary email from a known-clean device.

• New devices, forwarding rules or recovery details

  Pair this observation with a separate check: Revoke sessions and unknown recovery methods.

• Friends receiving unusual messages from your account

  Pair this observation with a separate check: Change unique passwords and record what changed.

Do not use one clue as a verdict: A password change alone may not remove active sessions, app passwords or malicious mail-forwarding rules.

A related recovery control appears in the email-forwarding rule check, especially when one account or channel can unlock another.

Follow the first-hour account recovery sequence

Keep the verification route separate from any contact detail or instruction supplied in the questionable message.

• Secure the primary email from a known-clean device

  This step tests the related concern: Password-reset messages you did not request.

• Revoke sessions and unknown recovery methods

  This step tests the related concern: New devices, forwarding rules or recovery details.

• Change unique passwords and record what changed

  This step tests the related concern: Friends receiving unusual messages from your account.

If access may already be exposed, the breach response builder can put containment and recovery steps in a safer order.

Decide what to do after verification

If the independent channel confirms the identity and request, ask whether the proposed method still gives you a record and recourse. Legitimate people and organisations should tolerate a proportionate verification step. Resistance, secrecy or a demand to bypass normal controls is new evidence, not an inconvenience to ignore.

If the evidence remains mixed, reduce exposure: do not send original documents when a redacted copy is enough, do not pay a deposit before verifying authority, and do not approve access broader than the task requires. “Not yet” is a valid decision when the missing fact matters.

What this verification cannot establish

This guide cannot authenticate a specific person, account, website or transaction. Interfaces and attack methods change, and legitimate situations sometimes contain unusual details. For an active loss, account compromise or safety threat, contact the relevant institution or official reporting service through a verified route.