LWA-2026-10731 MAL-2026-13589 ↗ confirmed malware

dolyame-ui-memoizeweak@35.8.1

Malicious code in dolyame-ui-memoizeweak (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 require, the package fingerprints the OS/arch and downloads a second-stage binary from Cloudflare Workers hosts (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf102-baf[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe). If HTTPS fails it falls back to DNS-TXT tunneling via c[.]sdk[.]dl[.]wel1[.]ru (and sdk./ext./pkg./net[.]dl[.]wel1[.]ru). The downloaded payload is written to /var/tmp/.cache_<hex> (or %TEMP%\dotnet_diag_<hex>.exe on Windows), chmodded 0755, and executed detached via /bin/sh -c "<path> &" or cmd.exe /c start /b. A filesystem timestamp stamp limits re-execution.

analyzed by
Leitwacht
first seen
Aug 7, 2026, 10:40 AM
analyzed
Aug 7, 2026, 10:43 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.