MAL-2026-6279

forge-jsx4 is a remote access trojan (RAT) published to the public npm registry by the account rafael_silva (rafael_silva@outlook.com). Versions 1.0.122 and 1.0.123 were published on June 21-22, 2026 as a reconstitution of the forge-jsx / forge-jsxy campaign, reusing the same command-and-control infrastructure and encryption after the earlier packages were taken down. The malware executes through a postinstall hook chain ("node scripts/postinstall-clipboard-event.mjs && node scripts/ensure-dist.mjs && node scripts/postinstall-durable-materialize.mjs && node scripts/postinstall-bootstrap.mjs && node scripts/postinstall-agent.mjs"), which runs automatically on npm install and skips CI environments to evade analysis. Once running it deploys a full RAT: system-wide keylogging via uiohook-napi, clipboard monitoring, .env file scanning, shell history collection, host inventory enumeration, desktop screenshot capture via jimp, and a WebSocket filesystem backdoor with remote file access. It scans the filesystem for cryptocurrency material (BIP39 mnemonics validated via checksum, Ed25519 Solana keypairs via tweetnacl, range-checked secp256k1 keys) and harvests browser-extension wallet databases across 21+ Chromium browsers (MetaMask, Phantom, Rabby). It establishes durable persistence outside node_modules (e.g. ~/.local/share/cfgmgr/.forge-jsxy/ on Linux, with macOS/Windows equivalents) plus autostart services (systemd user unit forge-js-worker.service, macOS LaunchAgent com.forgejs.worker.plist, Windows Task Scheduler ForgeJSWorker / HKCU Run key), so it survives npm uninstall, and supports relay-pushed auto-upgrades. Collected data is exfiltrated to a hardcoded C2 at 204.10.194.247 (WebSocket relay ws://204.10.194.247:9877, HTTP API http://204.10.194.247:8765, session password "secret"), to Discord bot webhooks (screenshots via ephemeral URLs), and to Hugging Face Hub repositories via the @huggingface/hub SDK. The payload uses an XOR-obfuscated AES-256-GCM key shared across all campaign waves.