First Time GCP Vertex AI Inference by Caller from Source ASN
Detects the first time in 14 days that a Vertex AI caller (user or service account) runs model inference (GenerateContent, StreamGenerateContent, Predict, or RawPredict) from a source autonomous system (ASN). Stolen…
Description
Detects the first time in 14 days that a Vertex AI caller (user or service account) runs model inference (GenerateContent, StreamGenerateContent, Predict, or RawPredict) from a source autonomous system (ASN). Stolen Google Cloud credentials, including exported service account keys and OAuth tokens, are used for LLMjacking from attacker infrastructure, which shows up as the victim identity calling models from a hosting provider, VPN, or residential proxy network it has never used before.
Detection logic
Its licence does not clear it for publishing here
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Detection requirements
- Platform
- ContainersESXiIaaSIdentity ProviderLinuxmacOSNetwork DevicesOffice SuiteSaaSWindows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
- Log source category
- event_index
Known benign triggers
- Service accounts whose workloads move between cloud providers, regions, or CI runners on different networks. Exclude these service accounts or pin their workloads to known networks.
- Users working from a new network such as travel, a new ISP, or a mobile hotspot. Confirm the location with the user.
MITRE ATT&CK mappings
0 exclusive techniques.This is coverage no other published rule has; it is not this rule's total technique count.
References
| Reference | Cited by |
|---|---|
| cloud.google.com/vertex-ai/docs/general/audit-logging | Only this detection cites it |
| www.elastic.co/docs/reference/integrations/gcp_vertexai | 10 |
From the source
- At source
- Open at source
- Upstream identifier
- 73b8ad81-a14b-4deb-8700-7e64cf9045ea
- Tagged by the source as
- Mitre Atlas: AML.T0012Data Source: GCPData Source: GCP Vertex AIData Source: Google Cloud PlatformDomain: CloudDomain: GenAIPlatform: GCPResources: Investigation GuideRule Type: New TermsService: GCP Vertex AITactic: Initial AccessThreat: LLMjackingThreat: Unauthorized AI UsageUse Case: Threat Detection
Licence
- Published under
- Elastic License 2.0Read the licence
- Attribution
- Required
Authorship
- Written by
- Published
- Oct 28, 2026
- Version
- 1