Suspicious Remote Payload Download Piped to Shell on Linux

ATT&CK techniques

Execution → C2

Recon
Resource Dev
Initial Access
Execution
- T1059.004Unix Shell
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1105Ingress Tool Transfer
Exfiltration
Impact

What it detects

This rule detects curl or wget output piped directly into a shell, the download-and-execute technique used by the PeerBlight Linux backdoor after exploiting React2Shell CVE-2025-55182. Piping a remote script straight to bash runs attacker code without touching disk for review. This one-line fetch-to-shell pattern is a common Linux initial execution indicator.

Reporting behind it

Related detections9 linkedT1059.004 — drag to rearrange

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Suspicious Downloaded Shell Stager Made Executable Via Chmod 777

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HamsaUpdate Linux Payload Download via Wget Piped to Bash (via process_creation)

Suspicious Remote Payload Download Piped to Shell on Linux

Pivot detection · T1059.004 · 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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