MAL-2026-13568 Malicious code in dolyame-ui-eventoutside (npm)

On require() of dolyame-ui-eventoutside, bootstrap.js selects a platform-specific URL, downloads a binary from string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf*.workers.dev) with a DNS-TXT-based fallback channel via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, writes the payload to a disguised temp path (Windows: dotnet_diag<hex>.exe; Unix:.cache_<hex>), chmods it 0755, and spawns it detached and unref'd through cmd.exe or /bin/sh. Destination hostnames are reassembled from split-string arrays (e.g. ["oob-worker.cf103-070.wo","rke","rs.de","v"].join("")) to defeat static inspection, and the dropped file is named to masquerade as a.NET diagnostics artifact (dotnet_diag_) or a hidden cache file (.analytics_state /.cache_). The package's advertised purpose is API client wrappers; fetching and executing arbitrary attacker-controlled binaries is unrelated to that purpose and gives the publisher arbitrary code execution on any machine that installs or imports the package.