Git checkout FETCH_HEAD resolves to malicious branch (Plugin4Shell)

Ankit Mehta@Secvyn

•updated Sep 18, 2026•1•0•2

Detects a suspicious sequence of Git operations ('fetch' followed by 'checkout') executed within a 5-minute window, where the initiating process is a known AI-assisted development tool (Claude, Codex, Copilot, or Gemini). This behavioral pattern may indicate an attempt to use AI tooling to facilitate the unauthorized access or exfiltration of code repositories.