MAL-2026-12846 Malicious code in bigops-timers (npm)

On require() of bigops-timers, index.js loads compat.js which downloads a platform-specific binary from Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS TXT-record chunked fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under masquerade filenames such as.cache<rand> and dotnet_diag_<rand>.exe, chmod 0755 is applied on Unix, and the file is spawned detached via /bin/sh -c '<file> &' or cmd.exe /c start. Destination hostnames, resolver domains, and the child_process module name are assembled by Array.join('') from split string fragments to evade static analysis. No hash or signature verification is performed, destinations are mutable and unrelated to the declared 'timers' purpose, and a second variant of the same fetch-chmod-spawn pipeline ships in lib/telemetry.js framed as an analytics SDK. Any consumer that installs or requires this package receives remote code execution under the installing user.

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.