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Google Workspace Device Registration After OAuth from Suspicious ASN

Detects when a Google Workspace account completes OAuth authorization for a specific Google OAuth client from a high-risk autonomous system number (ASN), followed within 30 seconds by a device registration event with…

Description

Detects when a Google Workspace account completes OAuth authorization for a specific Google OAuth client from a high-risk autonomous system number (ASN), followed within 30 seconds by a device registration event with account state REGISTERED. This sequence can indicate device enrollment or join flows initiated from attacker-controlled or residential-proxy infrastructure after a user authorizes a sensitive client.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

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Detection requirements

Platform
ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Log source category
event_index

Known benign triggers

  • Users on VPNs, carrier NAT, or cloud egress that map to flagged ASNs may match. Legitimate bulk enrollment or scripted onboarding that uses the same OAuth client can also produce the sequence. Baseline `source.as.organization.name` and successful registration sources before adding exclusions.

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