Malicious Command Injection Probe via node Spawning Shell Arithmetic Echo (via process_creation)

ATT&CK techniques

Initial Access → Execution

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
- T1059.004Unix Shell
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a node process spawning /bin/sh to echo an arithmetic expression, the validation probe used when exploiting the React Server Components vulnerabilities CVE-2025-55182 and CVE-2025-66478. Attackers confirm remote command execution by evaluating a math expression through the injected shell before delivering payloads.

Reporting behind it

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Malicious Command Injection Probe via node Spawning Shell Arithmetic Echo (via process_creation)

Pivot detection · T1059.004 · 9 related

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