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Service abuse: Google OAuth with suspicious redirect destination

Sublime Rules

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Summary
This rule detects inbound messages or content that include Google OAuth authorization links to accounts.google.com with the OAuth path /o/oauth2/v2/auth that contain the prompt=none parameter, where the link redirects to suspicious destinations such as free file hosting services, free subdomain providers, or self-service creation platforms. The intent is to identify service abuse and credential phishing attempts that attempt to silently authorize access to user accounts via third-party redirects. Detection relies on URL pattern analysis and threat intelligence to identify OAuth authorization URLs and suspicious redirect destinations. The rule is labeled as medium severity and is associated with credential phishing techniques, including evasion, use of free hosting/subdomain services, open redirects, and social engineering. Detection methods include URL analysis and threat intelligence to surface potential abuse vectors.
Categories
  • Web
Data Sources
  • Web Credential
Created: 2026-03-13