MAL-2026-12859 Malicious code in blocks-sahred-atom-mobile-app-bar-action (npm)

On require() of this package, index.js exposes a trivial stub class and then loads bridge.js, which selects a platform-specific endpoint, fetches an opaque binary from string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev) with a DNS TXT fallback channel over sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru carrying base64-chunked payload. The fetched bytes are written to /tmp or %TEMP% under disguised names (.cache<rnd> on Unix, dotnet_diag_<rnd>.exe on Windows), chmod 0755 on Unix, and spawned detached via /bin/sh -c or cmd.exe. C2 hostnames are assembled from split string arrays joined at runtime to evade static matching. The package name misspells 'shared' as 'sahred' and poses as a mobile SDK while the sibling _bridge.js performs the drop-and-execute.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.