sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-impl

Details

**Severity:** Critical

**Affected versions:** `= 35.8.1`

## Source: amazon-inspector (4554e1a911548ca2145464d06bcd3c66d69c9fb307a1df557924fb89b3e8c7fd)
On require() of the package, index.js loads _bootstrap.js which selects a payload path based on process.platform/arch (linux_x64, linux_arm64, darwin, win32), downloads an executable over HTTPS from one of several Cloudflare Workers subdomains whose hostnames are assembled at runtime via array-join obfuscation (oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT base64 chunked fallback across sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under a disguised name, chmod 755, and spawned detached via /bin/sh -c or cmd.exe. The package.json describes the module as "API client wrappers" for an internal payments module, but the on-load behavior is unrelated OS-branched remote code execution. Hostname obfuscation via array-join and a DNS-TXT fallback resolver are deliberate evasion of static string scanners.

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Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/f4865d38bdd8cf89a75895cd20168baaaa03aea4/osv/malicious/npm/sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-impl/MAL-2026-13655.json))

**References:**
- https://github.com/ossf/malicious-packages/blob/f4865d38bdd8cf89a75895cd20168baaaa03aea4/osv/malicious/npm/sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-impl/MAL-2026-13655.json
- https://www.npmjs.com/package/sme-rko-finance-front-payments-classic-payment-actions-operations-repeat-impl/v/35.8.1
- https://github.com/advisories/GHSA-8q7h-xvgq-ff27

Compromised versions (1)

• = 35.8.1

Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.