bigops-products-investmentnpm
Advisory published Updated
bigops-products-investment is a confirmed malicious npm package (MAL-2026-13241) that executes malicious code on install (malicious version 35.3.1). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in bigops-products-investment (npm)
What this malware does
Requiring [email protected] loads vendor.js at import time, which fetches a platform-specific executable from one of several Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev) whose hostnames are assembled via string-array.join concatenation to evade static detection. The downloaded bytes are written to /var/tmp or %TEMP% under disguised names (".cache<hex>" on POSIX, "dotnet_diag_<hex>.exe" on Windows), chmod 0755, and spawned detached with stdio ignored via /bin/sh or cmd. No hash or signature verification is performed. If the HTTPS fetch fails, the loader falls back to a covert DNS-TXT retrieval channel, querying chunked TXT records under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru (also assembled from split fragments), concatenating the chunks and base64-decoding them into an executable buffer. A separate 81KB lib/telemetry.js is bundled but not referenced from index.js. The package labels its state file "analytics_state" and gates opt-out on DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK, but the behavior is fetch-and-execute of author-controlled opaque binaries — not telemetry.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for bigops-products-investment (version 35.3.1).
If you installed it — respond
Remove bigops-products-investment 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-products-investment was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks bigops-products-investment-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.