AWS Bedrock AgentCore Gateway Tool Invocation Failure Burst

Description

Identifies a burst of failed tool invocations against a single AWS Bedrock AgentCore Gateway within a short window. Individual tool calls fail routinely from bad input or transient upstream errors, but a concentrated run of failures against one gateway can indicate an attacker, or a compromised tool wrapper, probing a tool's parameter surface for an injection point, an authorization bypass, or a schema weakness. Failures can be attributed only to the gateway, not to a specific tool, target, or caller, and a target that is broken for every caller produces the same burst as one caller probing it, so confirm gateway and target health before treating a burst as malicious.

Detection logic

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Detection requirements

Platform: Containers ESXi IaaS Linux macOS Network Devices Windows
The rule states no platform. This is derived from the ATT&CK technique it maps to.
Log source category: event_index

Known benign triggers

A tool or target that is broken or misconfigured for all callers (an upstream outage, a bad deployment, or an expired credential) produces the same failure burst as a single caller probing it, and the error events carry no caller, target, or tool identity to tell them apart. Confirm the gateway's target health and recent change history before treating a burst as adversarial, and add an exception by gateway (resource_arn) for gateways fronting known-flaky upstreams.

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
docs.aws.amazon.com/bedrock-agentcore/latest/devguide/gateway.html	Product documentation	Only this detection cites it

Detection rules

AWS Bedrock AgentCore Gateway Tool Invocation Failure Burst

Description

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules