bigops-alerts-widgetnpm
bigops-alerts-widget is a confirmed malicious npm package (MAL-2026-12831) that executes malicious code on install (malicious version 35.8.3). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in bigops-alerts-widget (npm)
What this malware does
On require() of bigops-alerts-widget, vendor.js selects a payload path based on process.platform and process.arch, downloads an opaque binary from one of several anonymous Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev), writes it to /tmp or %TEMP% under disguised filenames (.cache<hex>, dotnet_diag_<hex>.exe), chmods it 0755, and spawns it detached via spawn('/bin/sh') or spawn('cmd'). Destination hostnames are assembled from split character arrays via Array.join to avoid appearing as plain strings. If the primary fetch fails, a fallback path issues multiple DNS TXT queries against sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, concatenates the returned records, and base64-decodes them into an executable buffer that is then run the same way. Import-time execution of an attacker-controlled binary from anonymous infrastructure, combined with string-obfuscation of the destinations and a DNS-TXT covert channel, gives whoever published this package remote code execution on the installer's host.
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.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for bigops-alerts-widget (version 35.8.3). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging bigops-alerts-widget across your stack and pipelines.
If you installed it — respond
Remove bigops-alerts-widget from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If bigops-alerts-widget was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks bigops-alerts-widget before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks bigops-alerts-widget-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.