LWA-2026-10818 MAL-2026-13643 ↗ confirmed malware

sme-rko-finance-front-operations-overnight@35.8.1

Malicious code in sme-rko-finance-front-operations-overnight (npm)

T1105 · Ingress Tool TransferT1059.007 · JavaScriptT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information DiscoveryT1059 · Command and Scripting Interpreter

Analysis

On require, the package runs a hidden dropper (_ext.js) that fingerprints the host OS/arch and downloads a platform-specific second-stage binary over HTTPS from four Cloudflare Workers origins (oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev) at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If HTTPS is blocked it falls back to a DNS TXT chunked-transfer channel via c[.]sdk[.]dl[.]wel1[.]ru. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in the Windows temp dir), chmod 755, and executed detached via /bin/sh -c or cmd.exe start /b, so it runs in the background and outlives the parent.

analyzed by
Leitwacht
first seen
Aug 7, 2026, 09:55 PM
analyzed
Aug 7, 2026, 09:57 PM

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Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.