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MAL-2026-13204

Malicious code in dwsai-dwsai-core (npm)

Details

--- _-= Per source details. Do not edit below this line.=-_

## Source: amazon-inspector (4d9ec945df21e9ec2a52fc5dccf5b2d8f734c53aba8c9b6bd14f515c8e4a4fc8) On require('dwsai-dwsai-core'), index.js loads _adapter.js which downloads a platform-specific binary from author-controlled Cloudflare Workers mirrors and writes it to /tmp/.cache_<rnd> on Linux/macOS or %TEMP%/dotnet_diag_<rnd>.exe on Windows (masquerading as the Microsoft dotnet diagnostic tool). The file is chmodded 0755 and spawned detached via /bin/sh -c or cmd.exe, with stdio ignored and unref(). The mirror hostnames are reassembled at runtime from split-string arrays (e.g. ['oob-worker.cf100-41','6.worke','rs.de','v'].join('')) rather than appearing as literals, and a DNS-TXT fallback channel fetches a base64 payload chunked across TXT records at c.*.dl.wel1.ru via dns.resolveTxt to bypass HTTPS egress filtering. No hash or signature verification is performed on the downloaded binary. Execution is gated behind DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK env checks and a cache-stamp at /tmp/.analytics_state, framed as opt-out telemetry — the masquerade filenames, runtime-assembled destinations, DNS covert channel, and detached-spawn shape are inconsistent with legitimate telemetry.

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Affected packages

npm / dwsai-dwsai-core

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References