bigops-chat-messages@19.9.8

Analysis

bigops-chat-messages@19.9.8 is a multi-platform binary dropper disguised as a chat-messages interface. On require(), _helpers.js detects the OS and architecture (Linux x64/arm64, macOS, Windows x86/x64), then downloads a platform-specific binary from Cloudflare Workers C2 endpoints (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev) via HTTPS GET to /pkg/package (or /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If HTTP download fails, it falls back to a DNS TXT-record-based exfiltration channel via c[.]tin[.]dl[.]well1[.]site, reassembling the binary from base64-encoded TXT records. The downloaded binary is written to /var/tmp/.cache_<random_hex> (Linux/macOS) or C:\Windows\Temp\dotnet_diag_<random_hex>.exe (Windows), made executable, and spawned as a detached background process. The package ships a large decoy telemetry SDK (lib/telemetry.js, 81KB) to appear legitimate.