Cloud Service Discovery T1526
Tactic: Discovery
An adversary may attempt to enumerate the cloud services running on a system after gaining access. These methods can differ from platform-as-a-service (PaaS), to infrastructure-as-a-service (IaaS), or software-as-a-service (SaaS). Many services exist throughout the various cloud providers and can include Continuous Integration and Continuous Delivery (CI/CD), Lambda Functions, Entra ID, etc. They may also include security services, such as AWS GuardDuty and Microsoft Defender for Cloud, and logging services, such as AWS CloudTrail and Google Cloud Audit Logs.
Events covered
1 catalog event is tagged with this technique by at least one rule.
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 1 | Process creation |
Authoring guide
Patterns shared across the 44 rules above: which fields they filter on, what specific values they look for, and what they exclude. The catalog normalizes field names across vendors so Sigma's Image, Elastic's process.name, and Splunk's process_name collapse into one row. Each rule contributes at most once per row.
Fields filtered most (92 distinct)
The fields most rules look at when detecting this technique. The How column shows the operators authors use (eq, wildcard, regex_match, match) and how often each appears. Sample values are concrete examples to start from, not an exhaustive list.
Top indicator values (241 distinct)
Specific (field, operator, value) combinations the rules check for, ranked by how many rules under this technique use each one. The Corpus reach column counts how many rules across the entire catalog (any technique) check the same combination. High numbers point to widely-used indicators that are likely noisy on their own; combine them with another condition for useful signal. Blank means the combination is specific to rules under this technique. Click a value to expand the rules under this technique that use it.
Exclusions (34 distinct)
Field/operator/value combinations excluded by rules under this technique (top-level not() clauses), sorted by how many rules exclude each. These are the false-positive paths the community has learned to filter out. A new rule that ignores the high-count entries here will likely fire on the same noisy paths. Click a value to expand the rules under this technique that exclude it.
Rules under this technique
Every rule in the catalog tagged with this technique, grouped by vendor. Click a rule title for its full predicates, exclusions, and indicators.
Sigma 3 rules
Elastic 15 rules
- AWS Bedrock Foundation Model Enumeration Followed by Invocation via Long-Term Key
- AWS Discovery API Calls from VPN ASN for the First Time by Identity
- AWS Discovery API Calls via CLI from a Single Resource
- AWS Lateral Movement from Kubernetes SA via AssumeRoleWithWebIdentity
- AWS S3 Rapid Bucket Posture API Calls from a Single Principal
- AWS Service Quotas Multi-Region GetServiceQuota Requests
- Entra ID Sign-in BloodHound Suite User-Agent Detected
- Entra ID Sign-in TeamFiltration User-Agent Detected
- Microsoft Graph Multi-Category Reconnaissance Burst
- Rare AWS Error Code
- Rare Azure Activity Logs Event Failures
- Rare GCP Audit Failure Event Code
- Spike in AWS Error Messages
- Spike in Azure Activity Logs Failed Messages
- Spike in GCP Audit Failed Messages
Splunk 8 rules
- Amazon EKS Kubernetes cluster scan detection
- Amazon EKS Kubernetes Pod scan detection
- AWS Excessive Security Scanning
- Azure AD AzureHound UserAgent Detected
- Azure AD Service Principal Enumeration
- GCP Kubernetes cluster pod scan detection
- Kubernetes Scanner Image Pulling
- Kubernetes Suspicious Image Pulling
Kusto 9 rules
- AWSCloudTrail - SSM document is publicly exposed
- BTP - Failed access attempts across multiple BAS subaccounts
- Dataverse - Honeypot instance activity
- Dataverse - Suspicious use of Web API
- Dataverse - TI map IP to DataverseActivity
- Netskope - New Risky App Access vs 7-Day Baseline
- Snowflake - Possible discovery activity
- SOCRadar Unsynced Closed Incident
- Suspicious VM Instance Creation Activity Detected