LWA-2026-10348 MAL-2026-13251 ↗ confirmed malware

bigops-status-selection@35.3.2

Malicious code in bigops-status-selection (npm)

T1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1568.002 · DNS CalculationT1082 · System Information Discovery

Analysis

On require, the package downloads and executes a second-stage binary. It fingerprints the OS/architecture, then fetches a payload over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, and oob-worker[.]cf99-9b3[.]workers[.]dev at path /pkg/package (platform-specific variants /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If those fail it reconstructs the payload from DNS TXT records served under c[.]sdk[.]dl[.]wel1[.]ru (with per-arch domains sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The downloaded binary is written to a temp directory (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows) and launched detached via cmd.exe start /b on Windows or /bin/sh -c '... &' on Unix.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 02:23 PM
analyzed
Aug 5, 2026, 03:47 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.