Suspicious Bash Reverse Shell via /dev/tcp

PremiumReviewedSigma · High · v1
Product
linux
Category
process_creation
Author
HuntRule
Published
2026-05-25
Updated
2026-08-28

ATT&CK techniques

Execution → C2
  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Persistence

  5. Priv Esc

  6. Defense Evasion

  7. Cred Access

  8. Discovery

  9. Lateral Movement

  10. Collection

  11. Exfiltration

  12. Impact

What it detects

This rule detects Bash command lines that redirect a shell to a /dev/tcp socket, a fileless reverse-shell technique. This was used against Linux and SAP hosts following CVE-2025-31324 exploitation to obtain interactive remote access. Legitimate administrative use of /dev/tcp is uncommon and warrants investigation.

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Suspicious Bash Reverse Shell via /dev/tcp
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.