LWA-2026-10247 MAL-2026-13298 ↗ confirmed malware

dolyame-boxy-block@35.5.2

Malicious code in dolyame-boxy-block (npm)

T1195.002 · Compromise Software Supply ChainT1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1573 · Encrypted Channel

Analysis

On require, the package loads a bundled dropper (_runtime.js) that downloads a platform-specific binary over HTTPS from Cloudflare Workers hosts oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, and oob-worker[.]cf103-070[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If those fail it falls back to a DNS-TXT chunked base64 download from c[.]sdk[.]dl[.]wel1[.]ru / ext[.]dl[.]wel1[.]ru / pkg[.]dl[.]wel1[.]ru / net[.]dl[.]wel1[.]ru. The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under TEMP on Windows), made executable, and launched as a detached background process (cmd.exe /c start /b on Windows, /bin/sh -c "fp &" on Unix) so it runs independently of the parent. A throttle marker at /tmp/.analytics_state limits execution to roughly once per 6 hours. The package also ships an 81KB lib/telemetry.js masquerading as an analytics SDK.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 01:43 PM
analyzed
Aug 5, 2026, 02:41 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.