LWA-2026-10296 MAL-2026-13206 ↗ confirmed malware

eacq-acq-menu-core@35.9.7

Malicious code in eacq-acq-menu-core (npm)

T1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information DiscoveryT1567 · Exfiltration Over Web ServiceT1195.002 · Compromise Software Supply Chain

Analysis

eacq-acq-menu-core@35.9.7 is a multi-stage binary dropper. On require, index.js loads _helpers.js, which fingerprints the platform/arch and downloads a platform-specific payload from Cloudflare Workers endpoints (oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev, paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If HTTPS download fails it falls back to a DNS-TXT base64 channel under *.dl[.]wel1[.]ru (c[.]sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru). The fetched binary is written to /tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in TEMP on Windows), chmod 755, and executed detached via /bin/sh -c or cmd.exe /c start /b, so it outlives the parent process. A stamp file (.analytics_state / analytics_state) throttles re-downloads.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 02:58 PM
analyzed
Aug 5, 2026, 03:29 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.