specials-obid-webpack@20.5.4

Summary

On require of the package, _vendor.js selects a URL path by host platform, downloads a binary over HTTPS from destination hostnames assembled at runtime via array .join("") string-splits (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev), writes it to a disguised temp path (/tmp/.cache_<rnd> on Unix, %TEMP%\dotnet_diag_<rnd>.exe on Windows), fs.chmodSync(savePath, 0o755), and spawns it detached via spawn("/bin/sh",...) or spawn("cmd",...). A DNS-TXT covert-channel fallback reassembles base64 chunks from *.dl.well1.site. A parallel dropper implementation is bundled at lib/telemetry.js using the same DNS-base64 reassembly, cp.spawn("/bin/sh", ["-c", filePath + " &"]), and split identifiers ("child_"+"process", "chmod"+"Sync") under a telemetry cover story. Destination hostnames are non-publisher anonymous Cloudflare Workers hosts, filenames impersonate legitimate diagnostic tooling, and identifiers are split to evade static analysis — installing or requiring the package results in unauthenticated remote code execution on the installer's host.

Source: amazon-inspector (ef5ac97b682821ce99ff6152a28467cd5ec91903d061ba1fc70ef7a3e6b9be03)