OpenSSF/OSV advisory MAL-2026-13598 confirms this npm version as malicious. On require() of the package, index.js loads _bootstrap.js and the main-exported lib/telemetry.js, both of which implement the same download-and-execute dropper. The code selects a platform-tagged asset path (/pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe) and fetches it from string-split, obfuscated hostnames of the form oob-worker.cf1XX-XXX.workers.dev, with a DNS-TXT chunked-base64 fallback...
Source
OpenSSF Malicious Packages via OSV
Summary
Malicious code in dolyame-ui-selectaccount (npm)
Details
On require() of the package, index.js loads _bootstrap.js and the main-exported lib/telemetry.js, both of which implement the same download-and-execute dropper. The code selects a platform-tagged asset path (/pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe) and fetches it from string-split, obfuscated hostnames of the form oob-worker.cf1XX-XXX.workers.dev, with a DNS-TXT chunked-base64 fallback over sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched bytes are written to /var/tmp or the Windows TEMP directory under disguised names (.cache_<rand> or dotnet_diag_<rand>.exe), chmodded to 0755 via fs["chmod"+"Sync"], and spawned detached with stdio ignored via cp.spawn("/bin/sh", ["-c", filePath + " &"], { detached: true, stdio: "ignore" }).unref() or cmd.exe /c start /b. Dangerous API names are assembled at runtime by string concatenation (require("child_" + "process")) and the destination hostnames are reconstructed with Array.join to hide the C2 from static inspection. The 'Analytics SDK' / 'telemetry' framing does not correspond to the code's actual behavior, which is unconditional retrieval and execution of an attacker-controlled native binary on the installer's host at import time. No integrity check, pinning, or signature verification is performed on the downloaded payload.
Decision reason
OpenSSF Malicious Packages via OSV confirms dolyame-ui-selectaccount@35.8.1 as malicious (MAL-2026-13598): Malicious code in dolyame-ui-selectaccount (npm)