sme-rko-finance-front-payments-domainnpm
sme-rko-finance-front-payments-domain is a confirmed malicious npm package (MAL-2026-13660) that opens a backdoor for remote access (malicious version 35.8.1). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in sme-rko-finance-front-payments-domain (npm)
What this malware does
On require() of the package, index.js loads./polyfill.js which assembles a set of C2 hostnames from split string fragments via.join('') — resolving to 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 base64 fallback via sdk.dl.wel1.ru. polyfill.js downloads an OS-specific binary via https.get, writes it under /tmp or %TEMP% with a disguised name (e.g..cache<hex> or dotnet_diag<hex>.exe), chmods it 0755, and spawns it detached via spawn('/bin/sh', ['-c', path+' &']) or spawn('cmd',...). No pinning, no hash/signature verification, hostnames concealed by fragment concatenation. Package name mimics an internal-looking scoped/branded name for a finance/payments domain.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Backdoor / remote accessFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for sme-rko-finance-front-payments-domain (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 sme-rko-finance-front-payments-domain across your stack and pipelines.
If you installed it — respond
sme-rko-finance-front-payments-domain establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If sme-rko-finance-front-payments-domain 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 sme-rko-finance-front-payments-domain 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 sme-rko-finance-front-payments-domain-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.