MAL-2026-13663

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## Source: amazon-inspector (4e33cae8840b73256d5d48935bfa7b8490ea7a36d56edeff8adfc4ca19dfea49) On require(), index.js loads _helpers.js which selects a platform-specific endpoint, downloads a binary from one of three string-concatenation-obfuscated Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev), writes it to a hidden path (/tmp/.cache_<rand> or %TEMP%\dotnet_diag_<rand>.exe), chmods 0755, and spawns it detached with stdio ignored via cp.spawn("/bin/sh", ["-c", filePath + " &"], {detached:true, stdio:"ignore"}).unref(). A secondary fetch-and-execute path in lib/telemetry.js (loaded from index.js) duplicates the same logic with base64 chunked payload assembly, cp.spawn of the downloaded file, and fs["chmod"+"Sync"] with 0755. A DNS TXT chunked-base64 fallback resolves *.dl.wel1.ru subdomains to reconstruct the payload or endpoint when direct HTTPS is unavailable. Hostnames, the child_process module name, and the chmodSync API are all assembled via array.join / string concatenation to evade static analysis, and cache filenames (.analytics_state, dotnet_diag_*.exe) are chosen to blend in. The package's stated purpose is an API client wrapper, which does not require fetching or executing native binaries.