Detects Vertex AI authenticated caller activity for the same client.user.email from at least three countries and three source IPs within a four-hour interval. That pattern can indicate stolen user or service-account credentials reused from multiple regions, including VPN or cloud egress and return trips where first and last locations are close.

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Detects the same Vertex AI authenticated caller (client.user.email) generating aiplatform audit activity from geographically distant source IPs within a short window at an impossible travel speed. That pattern can indicate a stolen user or service-account credential used from multiple regions. Related: GCP Vertex AI Caller Activity From High Number of Countries covers slower multi-country reuse without a high-speed hop.

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Detects the same API Management subscription key calling Microsoft Foundry from source IPs in two or more countries, far enough apart and fast enough that the hop is not physical travel. Calls are grouped by apim_subscription_id. Requests with no subscription key are ignored, because those are unauthenticated calls and share no key.

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Detects Anthropic activity for the same user email from at least three countries and two unique user agents within a four-hour interval. This highly unusual activity may indicate leaked session cookies being abused by a remote adversary using a VPN.

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Detects successful Google Workspace sign-ins for the same user from two geographically separated locations within a 90-minute window, where the implied travel speed between the two points exceeds what is physically possible (>=800 km/h, faster than modern commercial airliners) and the geographic separation is at least 500 km. This pattern indicates either VPN/proxy use or an adversary signing in to a compromised account from a different location than the legitimate user.

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Detects successful Microsoft 365 portal logins from a country and region the user has not previously authenticated from in a specific time window. Atypical regions are identified by combining the user's country and region geolocation history; an authentication from a new country/region pair for that user may indicate an adversary attempting to access the account from an unusual location or behind a VPN.

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Detects successful Microsoft 365 portal logins from impossible travel locations. Impossible travel locations are defined as two different countries within a short time frame. This behavior may indicate an adversary attempting to access a Microsoft 365 account from a compromised account or a malicious actor attempting to access a Microsoft 365 account from a different location.

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Detects successful Microsoft Entra ID interactive sign-ins for the same user from two geographically separated locations within a 90-minute window, where the implied travel speed between the two points exceeds what is physically possible (>=800 km/h, faster than modern commercial airliners) and the geographic separation is at least 500 km. This pattern indicates either VPN/proxy use or an adversary signing in to a compromised account from a different location than the legitimate user. Non-interactive sign-in categories are excluded because backend token refresh activity routinely egresses through cloud regions unrelated to the user. This activity is often observed from AiTM phishing kits or successful phishing campaigns.

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