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Malicious package

bigops-abstract-entity-datanpm

Advisory published Updated

bigops-abstract-entity-data is a confirmed malicious npm package (MAL-2026-13524) that executes malicious code on install (malicious version 35.1.7). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bigops-abstract-entity-data (npm)

MAL-2026-13524
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall bigops-abstract-entity-data

What this malware does

index.js unconditionally requires./loader on module load. loader.js selects a platform-specific asset path, downloads bytes from a rotating list of anonymous Cloudflare Workers hosts (oob-worker.cf101-.workers.dev, oob-worker.cf102-.workers.dev, oob-worker.cf103-*.workers.dev, cf99-9b3.workers.dev) with a DNS-TXT chunked fallback resolved under *.dl.wel1.ru, writes the bytes to /tmp or %TEMP% under decoy names (.cache<rand> on Unix, dotnet_diag<rand>.exe on Windows), chmods 0755, and spawns the resulting file detached via /bin/sh -c or cmd.exe /c start /b. Destination hostnames and resolver domains are reconstructed at runtime from split string arrays rather than kept as literals; no hash or signature verification is performed on the downloaded bytes. Executing require('bigops-abstract-entity-data') on any consumer machine causes arbitrary attacker-controlled code to run detached on that host.

Malicious versions

1 flagged
35.1.7

Indicators of compromise (SHA-256)

294402f19750cb519f7bdcf28e24e057513e0fc59cbfa4bc8e24a39b93832351

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for bigops-abstract-entity-data (version 35.1.7).

  2. If you installed it — respond

    Remove bigops-abstract-entity-data 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.

  3. Did it already run?

    If bigops-abstract-entity-data 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

No. bigops-abstract-entity-data on npm has been identified as a malicious package (version 35.1.7 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-016988

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks bigops-abstract-entity-data-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.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database
bigops-abstract-entity-data (npm) malicious package — MAL-2026-13524 | O3 Security