Suspicious Container Environment Reconnaissance in Serverless Build

ATT&CK techniques

Discovery

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
- T1613Container and Resource Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects container-awareness reconnaissance that reads /proc/self/cgroup, the /.dockerenv marker file or /etc/passwd from inside a serverless build environment. In this Cloud Functions abuse chain a malicious package.json runs during the build and fingerprints the container before pivoting with the attached Cloud Build service account, so this recon precedes privilege escalation and Ngrok-based exfiltration.

Reporting behind it

Related detections9 linkedT1613 — drag to rearrange

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Suspicious Kubernetes SelfSubjectAccessReview Permission Enumeration

Malicious Kubernetes Reconnaissance Tooling Activity

Suspicious Kubernetes Secret Enumeration via kubectl

Suspicious Kubernetes API Request From Anonymous User

Suspicious Kubernetes Secret and Permission Enumeration via kubectl (via process_creation)

Suspicious Anonymous Access to Kubernetes API Server via Audit Log

Suspicious Container Environment Reconnaissance in Serverless Build

Pivot detection · T1613 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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