dolyame-ui-flatcornersnpm
dolyame-ui-flatcorners is a confirmed malicious npm package (MAL-2026-13569) that executes malicious code on install (malicious version 35.8.1). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in dolyame-ui-flatcorners (npm)
What this malware does
On require()/import of the package, both adapter.js and the advertised main module lib/telemetry.js download an OS-specific binary from obfuscated third-party endpoints (Cloudflare Workers subdomains oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, with a DNS-TXT chunked fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), write it to /var/tmp/.cache<hex> or %TEMP%\dotnet_diag_<hex>.exe, mark it executable via fs['chmod'+'Sync'](path, 0o755), and spawn it detached via cp.spawn('/bin/sh', ['-c', filePath + ' &'], {detached:true, stdio:'ignore'}) or cmd equivalent. Hostnames, filesystem API names, and the child_process require string are reassembled at runtime through string concatenation and.join('') to evade static detection. The dropper is duplicated across _adapter.js and lib/telemetry.js so execution occurs even if one path fails. The fetched payload is opaque, unpinned, unverified, and unrelated to the package's stated purpose (Common TypeScript definitions).
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for dolyame-ui-flatcorners (version 35.8.1). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging dolyame-ui-flatcorners across your stack and pipelines.
If you installed it — respond
Remove dolyame-ui-flatcorners 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 dolyame-ui-flatcorners was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks dolyame-ui-flatcorners before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks dolyame-ui-flatcorners-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.