certificates-revocation-utilsnpm
Advisory published Updated
certificates-revocation-utils is a confirmed malicious npm package (MAL-2026-12539) that executes malicious code on install (malicious version 35.1.9). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in certificates-revocation-utils (npm)
What this malware does
On module load, index.js requires vendor.js which fetches a platform-specific binary from runtime-reconstructed Cloudflare Workers hostnames (assembled via split-string concatenation such as ['oob-worker.','cf101-','adf.workers.','de','v'].join('')) with a DNS-TXT base64 chunked fallback resolved via *.dl.wel1.ru. The fetched bytes are written to a temp path with a randomized name, chmod 0755'd on POSIX, and executed via detached cp.spawn('/bin/sh',['-c', fp+' &'],{detached:true}) or cp.spawn('cmd.exe',['/c','start','/b',fp]). The download URL is not pinned, not hash-verified, and unrelated to the package's stated purpose ("shared utilities"). Additional obfuscation hides the child_process require and chmodSync call (require('child'+'process'), fs['chmod'+'Sync']), and a /tmp/.analytics_state stamp gates single-execution-per-TTL. Requiring or installing this package causes arbitrary attacker-controlled code to execute on the installer's machine.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Search your lockfiles and build artifacts for certificates-revocation-utils (version 35.1.9).
If you installed it — respond
Remove certificates-revocation-utils 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 certificates-revocation-utils 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 certificates-revocation-utils-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.