Problem
OAuth access granted to a malicious application persists after the original phishing email is deleted.
Solution
Root Cause / Diagnostic:
Deleting a phishing email destroys the initial attack vector but leaves the server-side OAuth 2.0 grant intact within the Google account infrastructure. The authorized third-party application holds independent cryptographic tokens that communicate directly with Google and YouTube APIs without referencing the deleted email.
Actionable Fix:
1. Google Connected Apps Scrub: Open Google Account Security, enter "Third-party apps with account access", and locate applications granted access around the date of the phishing event.
2. Revoke Malicious API Grants: Click "Remove Access" on the malicious or unverified application to immediately revoke its OAuth refresh and bearer tokens.
3. OAuth Audit Logging: Review the Google Workspace or Google Security alert history to verify the exact timestamp of app authorization and ensure no secondary services were compromised.
Pro Tip:
Deleting a scam email does nothing to stop the malware if you already clicked 'Allow' on the Google permission popup. The grant lives in your Google account cloud settings, not in your inbox.
Deleting a phishing email destroys the initial attack vector but leaves the server-side OAuth 2.0 grant intact within the Google account infrastructure. The authorized third-party application holds independent cryptographic tokens that communicate directly with Google and YouTube APIs without referencing the deleted email.
Actionable Fix:
1. Google Connected Apps Scrub: Open Google Account Security, enter "Third-party apps with account access", and locate applications granted access around the date of the phishing event.
2. Revoke Malicious API Grants: Click "Remove Access" on the malicious or unverified application to immediately revoke its OAuth refresh and bearer tokens.
3. OAuth Audit Logging: Review the Google Workspace or Google Security alert history to verify the exact timestamp of app authorization and ensure no secondary services were compromised.
Pro Tip:
Deleting a scam email does nothing to stop the malware if you already clicked 'Allow' on the Google permission popup. The grant lives in your Google account cloud settings, not in your inbox.