Suspicious Environment Variable Dump Piped to Base64 for CI Credential Exfil

ATT&CK techniques

Cred Access → Exfiltration

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
- T1552.001Credentials In Files
Discovery
Lateral Movement
Collection
C2
Exfiltration
- T1567Exfiltration Over Web Service
Impact

What it detects

This rule detects a process reading the full environment and piping it through base64 encoding to stage secrets for exfiltration as seen in CI CD pipeline abuse research by Elastic. Dumping env with null separators and double base64 encoding is a hallmark of automated credential harvesting inside build runners.

Reporting behind it

Related detections9 linkedT1552.001 — drag to rearrange

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Suspicious Discord Webhook Exfiltration via HTTP (via proxy)

Malicious TCC Privacy Database Access via sqlite3

Malicious Veeam Backup Credential Theft via psql Query of Credentials Table (via process_creation)

Malicious EtherRAT C2 Exfiltration Endpoints via HTTP (via proxy)

Malicious Marimo Notebook Credential File Access via Shell (via process_creation)

Suspicious Environment Variable Dump Piped to Base64 for CI Credential Exfil

Pivot detection · T1552.001 · 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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