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 detections5 linkedT1613 — drag to rearrange

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

Kubernetes audit log signals potential tool and shell enumeration/execution activity

Suspicious Container Environment Reconnaissance in Serverless Build

Pivot detection · T1613 · 5 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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