LWA-2026-10776 MAL-2026-13504 ↗ confirmed malware

dolyame-ui-attachfile@35.8.1

Malicious code in dolyame-ui-attachfile (npm)

T1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information DiscoveryT1567 · Exfiltration Over Web Service

Analysis

On load, the package runs a bundled dropper (_shim.js) that fingerprints the OS/architecture and downloads a binary payload over HTTPS from three Cloudflare Workers hosts (oob-worker[.]cf103-070[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev) at per-platform paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, and /pkg/package.exe. If the HTTP download fails it falls back to a DNS-TXT command channel under the domains sdk[.]dl[.]wel1[.]ru, ext[.]dl[.]wel1[.]ru, pkg[.]dl[.]wel1[.]ru, and net[.]dl[.]wel1[.]ru (querying c.<domain> for a chunk count, then base64 chunks from N.<domain>). The downloaded payload is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe in TEMP on Windows), made executable, and launched as a detached background process via /bin/sh -c or cmd.exe start /b. The package also writes a marker file (~/.analytics_state or %TEMP%\analytics_state) to throttle re-execution.

analyzed by
Leitwacht
first seen
Aug 7, 2026, 11:25 AM
analyzed
Aug 7, 2026, 11:25 AM

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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.