Malicious code in bigops-tcrm-permissions (npm)
The npm package bigops-tcrm-permissions contained malicious code that downloads and executes platform-specific binaries from attacker-controlled infrastructure (Cloudflare Workers and Russian domains) upon require. The package was identified by Amazon Inspector and credited to OpenSSF's malicious-packages project.
- Disclosed
- Last updated
- Blast radius
- Any npm consumer of bigops-tcrm-permissions
- Ecosystems
- Attack vectors
- Affected entities
- bigops-tcrm-permissionsnpm package containing malicious dropper code
The npm package bigops-tcrm-permissions contained embedded malicious code designed to download and execute arbitrary binaries. When the package was required, index.js would load _runtime.js, which fetched platform-specific binaries from hardcoded Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev) with DNS-TXT base64 fallback via Russian domains (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru).\n\nThe malicious code wrote downloaded bytes to temporary directories (/var/tmp on Unix or %TEMP% on Windows) under hidden/decoy filenames, set executable permissions (chmod 0755), and spawned the binary detached via shell commands. No hash or signature verification was performed on the downloaded binaries, and the C2 infrastructure was unrelated to the package publisher.\n\nTo evade static analysis, dangerous API calls and destination hostnames were reassembled from string fragments at runtime. A duplicate dropper mechanism was present in lib/telemetry.js, disguised as an 'Analytics SDK', providing a second execution path against the same C2 infrastructure.\n\nThe package was identified by Amazon Inspector and credited to the OpenSSF's malicious-packages project.
Indicators of compromise
- Packages
- bigops-tcrm-permissions
- Domains
- oob-worker.cf101-adf.workers.dev
- oob-worker.cf103-070.workers.dev
- oob-worker.cf102-baf.workers.dev
- sdk.dl.wel1.ru
- ext.dl.wel1.ru
- pkg.dl.wel1.ru
- net.dl.wel1.ru
Remediation
- Remove bigops-tcrm-permissions from all projects immediately
- Audit npm dependencies for any other suspicious packages from the same publisher
- Review execution logs and system activity on any systems that installed this package
- Regenerate any credentials or secrets that may have been exposed on affected systems
- Monitor for unexpected outbound connections to the identified C2 domains (oob-worker.cf*.workers.dev, *.dl.wel1.ru)
Sources
- GitHub Advisory GHSA-gpvp-vfrf-23hv · GitHub Advisory Database
Cite this entry
"Malicious code in bigops-tcrm-permissions (npm)." supplychainattack.org, Supply Chain Attack Incident Catalog. Disclosed August 6, 2026; last updated August 6, 2026. https://supplychainattack.org/incident/malicious-code-in-bigops-tcrm-permissions-npm-w8yprp
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