LWA-2026-10387 MAL-2026-13132 ↗ confirmed malware

dolyame-boxy-stories-of-block@35.8.6

Malicious code in dolyame-boxy-stories-of-block (npm)

T1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1071.004 · DNST1082 · System Information DiscoveryT1041 · Exfiltration Over C2 Channel

Analysis

On require, the package executes a multi-stage dropper. It fingerprints the host platform/architecture and downloads a binary payload over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, and oob-worker[.]cf103-070[.]workers[.]dev at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, and /pkg/package.exe. If the HTTP download fails, it falls back to retrieving the payload in base64 chunks via DNS TXT queries against c[.]sdk[.]dl[.]wel1[.]ru (with sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, net[.]dl[.]wel1[.]ru as resolvers). The downloaded binary is written to a randomly-named file (/var/tmp/.cache_<hex> on Unix, dotnet_diag_<hex>.exe in the temp dir on Windows), made executable, and launched as a detached background process via cmd.exe /c start /b or /bin/sh -c "<file> &".

analyzed by
Leitwacht
first seen
Aug 5, 2026, 03:51 PM
analyzed
Aug 5, 2026, 03:59 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.