Elastic Security Labs released triage and behavior-based detections for the Axios supply-chain compromise, where malicious axios versions 1.14.1 and 0.30.4 pulled in [email protected] and executed payloads through npm postinstall activity. The delivery chain consistently moved from node to OS-native interpreters or shells, using curl, cscript, osascript, PowerShell, or zsh to fetch and launch second-stage payloads across Linux, Windows, and macOS. The Linux payload was a Python RAT, the Windows payload was a PowerShell RAT with Run-key persistence and in-memory execution support, and the macOS payload was a self-signed Mach-O backdoor masquerading as an Apple-like cache component. Elastic highlights high-signal process ancestry, renamed signed-binary execution, suspicious registry writes, base64 PowerShell decoding, invalid code signatures, and C2 arguments as detection opportunities. The activity matters because defenders can catch the compromise through cross-platform behavioral patterns rather than depending only on specific filenames or hardcoded indicators.