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Malicious package

sme-rko-finance-front-payments-domainnpm

Advisory published Updated

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)

MAL-2026-13660
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall sme-rko-finance-front-payments-domain

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

1 flagged
35.8.1

Indicators of compromise (SHA-256)

d8fcad12c3078bf2134f5e3cafd7ffa0ecf9f2bfec919533881d5c65b738b9fa

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for sme-rko-finance-front-payments-domain (version 35.8.1).

  2. 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.

  3. Did it already run?

    If sme-rko-finance-front-payments-domain 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

No. sme-rko-finance-front-payments-domain on npm has been identified as a malicious package (version 35.8.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-017165

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.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database
sme-rko-finance-front-payments-domain (npm) malicious package — MAL-2026-13660 | O3 Security