LWA-2026-10705 MAL-2026-13523 ↗ confirmed malware

beaver-ui-popover-marker@35.5.8

Malicious code in beaver-ui-popover-marker (npm)

T1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information DiscoveryT1059 · Command and Scripting Interpreter

Analysis

beaver-ui-popover-marker@35.5.8 is a trojanized "React components" package that downloads and executes a remote binary at require-time. On load, lib/telemetry.js (loaded via index.js -> _vendor.js) runs a bootstrap that fetches a platform-specific payload over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf103-070[.]workers[.]dev, and oob-worker[.]cf99-9b3[.]workers[.]dev (paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe), with a DNS-TXT base64 fallback channel via c[.]sdk[.]dl[.]wel1[.]ru (and 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 in the temp dir on Windows), made executable, and launched as a detached background process via /bin/sh -c "fp &" or cmd.exe /c start /b. The bootstrap skips execution if DISABLE_TELEMETRY, ANALYTICS_OPT_OUT, or DO_NOT_TRACK is set, and writes a state file (/tmp/.analytics_state) to throttle re-runs.

analyzed by
Leitwacht
first seen
Aug 7, 2026, 07:55 AM
analyzed
Aug 7, 2026, 07:56 AM

Related advisories

browse all confirmed advisories →

Independently detected by the Leitwacht supply-chain probe. IOCs are defanged. Published CC0. Think this is a mistake? See the dispute policy.