Browse Rules

AWS Discovery API Calls via CLI from a Single Resource

Detects when a single AWS resource is running multiple read-only, discovery API calls in a 10-second window. This behavior could indicate an actor attempting to discover the AWS infrastructure using compromised credentials or a compromised instance. Adversaries may use this information to identify potential targets for further exploitation or to gain a better understanding of the target's infrastructure.

AWS Attempt to Leave Organization

Detects any attempt, successful or denied, for a member account to leave an AWS Organization via the LeaveOrganization API. Leaving an organization immediately strips the account of every Service Control Policy (SCP) guardrail the organization enforces, removes it from centralized CloudTrail aggregation, and eliminates the management account's ability to audit or control it going forward. An adversary who has gained root or organization-management-capable access in a member account may use this

AWS Rare Source AS Organization Activity

Surfaces an AWS identity whose successful API traffic is dominated by a small set of large cloud-provider source AS organization labels, yet also shows a very small share of traffic from other AS organization names—including at least one sensitive control-plane, credential, storage, or model-invocation action on that uncommon network path with recent activity from the uncommon path. The intent is to highlight disproportionate “baseline” cloud egress versus sparse use from rarer networks on the s

AWS EC2 Role GetCallerIdentity from New Source AS Organization

Identifies the first time an EC2 instance role session calls AWS STS GetCallerIdentity from a given source autonomous system (AS) organization name within the lookback window. Adversaries who steal instance role credentials often verify them with GetCallerIdentity from infrastructure outside your normal egress paths. Baseline learning on the pairing of identity and source network reduces noise from stable NAT or AWS-classified egress compared to alerting on every call from a non-Amazon ASN.

AWS Account Closed

Detects the closure of an AWS account via the CloseAccount API. This can be called either by the account itself (account.amazonaws.com, self-service closure) or by an AWS Organizations management account against one of its member accounts (organizations.amazonaws.com). Account closure triggers a 90-day grace period during which the account is suspended before permanent termination, and is one of the most destructive and disruptive actions available in AWS. It removes access to all resources and

AWS CloudTrail Log Created

Detects creation of a new AWS CloudTrail trail via CreateTrail API. While legitimate during onboarding or auditing improvements, adversaries can create trails that write to attacker-controlled destinations, limit regions, or otherwise subvert monitoring objectives. New trails should be validated for destination ownership, encryption, multi-region coverage, and organizational scope.

AWS Bedrock Untrusted Model Imported or Marketplace Endpoint Registered

Detects when an AWS Bedrock custom model is imported or deployed, or when a marketplace model endpoint is created or registered, via the CreateModelImportJob, CreateCustomModelDeployment, CreateMarketplaceModelEndpoint, or RegisterMarketplaceModelEndpoint API calls. These actions introduce a model artifact from outside the organization's trusted training and approval pipeline. A backdoored, poisoned, or attacker-supplied model that downstream applications subsequently invoke represents a softwar

AWS Organizations Delegated Administrator Registered

Detects when an AWS member account is registered as a delegated administrator for an AWS service via the RegisterDelegatedAdministrator API. Delegated administrators receive service-level administrative access across the entire organization without being the management account. An attacker who compromises a principal with organizations permissions can abuse overly permissive managed policies to register a member account they control as a delegated administrator, then use that privileged access t

AWS GuardDuty Member Account Manipulation

Detects attempts to disassociate or manipulate Amazon GuardDuty member accounts within an AWS organization. In multi-account GuardDuty deployments, a delegated administrator account aggregates findings from member accounts. Adversaries may attempt to disassociate member accounts, delete member relationships, stop monitoring members, or delete pending invitations to break this centralized visibility. These actions can be precursors to or alternatives for deleting GuardDuty detectors entirely, all

AWS Account Discovery By Rare User

Identifies the first time, within a lookback window, an identity performs AWS Organizations or IAM account enumeration APIs. Attackers with compromised credentials often map the organization (accounts, OUs, roots, delegated admins) and account-level metadata (aliases, summary) using the AWS CLI or SDKs. This is a New Terms rule detecting a rare occurrence of the `cloud.account.id` and `user.name` pair for these actions.

AWS AssumeRoleWithWebIdentity from Kubernetes SA and External ASN

Detects successful `AssumeRoleWithWebIdentity` where the caller identity is a Kubernetes service account and the source autonomous system organization is present but not `Amazon.com, Inc.` EKS workloads that obtain IAM credentials via IAM Roles for Service Accounts (IRSA) normally reach STS from AWS-managed or AWS-associated networks; the same identity from a clearly external ASN can indicate a stolen or misused projected service-account token being exchanged for IAM credentials off-cluster.

AWS Lambda Layer Shared Externally

Identifies the modification of an AWS Lambda layer permission policy to grant another AWS account, an AWS Organization, or the public the ability to use a layer version. Lambda layers package code and dependencies that are loaded into the execution environment of any function that references them. Sharing a layer with an external account or with everyone can leak proprietary code or secrets bundled in the layer, and can serve as a supply-chain mechanism whereby downstream functions load attacker

AWS EC2 CreateKeyPair by New Principal from Non-Cloud AS Organization

Identifies the first time a given IAM principal successfully creates an EC2 key pair when the request is sourced from a network whose autonomous system organization is not attributed to common cloud or hyperscaler providers in your GeoIP data. Adversaries may call CreateKeyPair to stage SSH access material before launching or accessing instances. A new terms baseline on `user_identity.arn` suppresses repeated noise from the same principal while still surfacing the initial suspicious creation fro

AWS Root Console Login Password Spraying

Identifies failed authentication attempts against the AWS Management Console root user from the same source IP address targeting multiple AWS accounts. Password spraying uses few attempts per target across many accounts to avoid lockout, making per-account volume an unreliable signal. This rule detects the cross-account breadth pattern: a single source IP generating root ConsoleLogin failures across two or more distinct AWS accounts. Requires an AWS Organizations-level CloudTrail trail aggregati

AWS Bedrock Guardrail Deleted or Weakened

Detects deletion, weakening, or version management of AWS Bedrock guardrails via the DeleteGuardrail, UpdateGuardrail, DeleteEnforcedGuardrailConfiguration, or PutEnforcedGuardrailConfiguration APIs. Bedrock guardrails enforce content, topic, word, and sensitive-information policies on model invocations. Deleting a guardrail, loosening its policies, removing or overwriting the organization-enforced guardrail configuration, or creating a new version to enforce a weakened configuration allows an a