LWA-2026-10166 MAL-2026-12682 ↗ confirmed malware

delivery-ci-storyshots@35.3.6

Malicious code in delivery-ci-storyshots (npm)

T1059 · Command and Scripting InterpreterT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1102 · Web ServiceT1082 · System Information DiscoveryT1059.003 · Windows Command Shell

Analysis

Requiring the package triggers a dropper (bundled _adapter.js). It fingerprints the host platform/arch, then downloads a second-stage binary over HTTPS from Cloudflare Workers endpoints oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf99-9b3[.]workers[.]dev and oob-worker[.]cf102-baf[.]workers[.]dev at paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac or /pkg/package.exe. If those fail it reconstructs the payload from DNS TXT records chunked across subdomains of sdk[.]dl[.]wel1[.]ru / ext[.]dl[.]wel1[.]ru / pkg[.]dl[.]wel1[.]ru / net[.]dl[.]wel1[.]ru. The downloaded binary is written to /var/tmp/.cache_<hex> (or dotnet_diag_<hex>.exe under %TEMP% on Windows), chmod 755, and executed detached via /bin/sh -c or cmd.exe /c start /b. A marker file (/tmp/.analytics_state) throttles re-execution. The package's public API is a decoy class; the dropper runs on require.

analyzed by
Leitwacht
first seen
Aug 5, 2026, 01:30 PM
analyzed
Aug 5, 2026, 01:51 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.