Malicious code in bigops-shared-product-design (npm)
bigops-shared-product-design@35.9.3 on npm contains malicious code that downloads and executes platform-specific native binaries from attacker-controlled Cloudflare Workers hosts and DNS-TXT fallback resolvers. The dropper is loaded unconditionally on require() and uses obfuscation and masquerade filenames to evade detection.
- Disclosed
- Last updated
- Blast radius
- Any npm consumer of bigops-shared-product-design@35.9.3
- Ecosystems
- Attack vectors
- Affected entities
- bigops-shared-product-design · 35.9.3
The npm package bigops-shared-product-design version 35.9.3 contains malicious code embedded in _adapter.js and lib/telemetry.js. Both modules implement a dropper pattern that fetches platform-specific native binaries from hardcoded attacker infrastructure.
The adapter.js module is unconditionally loaded via index.js on require(). It fetches binaries from Cloudflare Workers hosts (oob-worker.cf101-a.workers.dev, cf99-9b3.workers.dev, cf100-416.workers.dev) with a DNS-TXT fallback mechanism querying resolver domains under dl.wel1.ru. The fetched bytes are written to /tmp/.cache on Unix or %TEMP%/dotnet_diag_.exe on Windows, made executable (chmod 0755), and spawned detached via shell commands.
The lib/telemetry.js module contains an identical download-chmod-spawn pattern using base64-decoded chunks, indicating a shared dropper toolkit. String literals are fragmented and concatenated at runtime to evade static analysis tools. No hash pinning, signature verification, or legitimate publisher justification is present.
The infrastructure destinations, resolver domains, masquerade filenames, /tmp staging, detached spawning, and DNS-TXT chunked fallback are consistent with known dropper tradecraft.
Indicators of compromise
- Packages
- bigops-shared-product-design
- Domains
- oob-worker.cf101-a.workers.dev
- cf99-9b3.workers.dev
- cf100-416.workers.dev
- dl.wel1.ru
Remediation
- Immediately remove bigops-shared-product-design@35.9.3 from all environments
- Audit all systems that installed this package version for unexpected processes, network connections, or files in /tmp/.cache_ or %TEMP%/dotnet_diag_.exe
- Review npm audit logs and dependency trees for this package
- Block outbound connections to oob-worker.cf101-a.workers.dev, cf99-9b3.workers.dev, cf100-416.workers.dev, and dl.wel1.ru at the network level
- Update to a patched version if available, or remove the dependency entirely
- Monitor for similar obfuscated dropper patterns in other dependencies
Sources
- GitHub Advisory GHSA-rpgw-73pw-cfcm · GitHub Advisory Database
Cite this entry
"Malicious code in bigops-shared-product-design (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 7, 2026; last updated August 7, 2026. https://supplychainattack.org/incident/malicious-code-in-bigops-shared-product-design-npm-l55w4f
Suggest a correction
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