LWA-2026-7561 MAL-2026-12239 ↗ confirmed malware

tinkoff-component-page-loader@20.8.2

Malicious code in tinkoff-component-page-loader (npm)

T1195.002 · Compromise Software Supply ChainT1059.007 · JavaScriptT1105 · Ingress Tool TransferT1071.001 · Web ProtocolsT1573 · Encrypted ChannelT1082 · System Information DiscoveryT1204.002 · Malicious File

Analysis

On require(), the package fingerprints the host OS and architecture, then downloads a platform-specific binary payload from Cloudflare Workers C2 infrastructure (oob-worker[.]cf99-9b3[.]workers[.]dev, oob-worker[.]cf100-416[.]workers[.]dev, oob-worker[.]cf101-adf[.]workers[.]dev) via HTTPS GET to paths /pkg/package, /pkg/package-arm64, /pkg/loader_mac, or /pkg/package.exe. If the HTTPS fetch fails, it falls back to DNS TXT-based chunked binary retrieval from domains under well1[.]site (tin[.]dl[.]well1[.]site, tina[.]dl[.]well1[.]site, ldr[.]dl[.]well1[.]site, win[.]dl[.]well1[.]site). The downloaded binary is written to /var/tmp/.cache_<random> (Linux/macOS) or %TEMP%\dotnet_diag_<random>.exe (Windows) and executed as a detached background process via cmd.exe /c start /b or /bin/sh -c.

analyzed by
Leitwacht
first seen
Aug 2, 2026, 05:16 PM
analyzed
Aug 2, 2026, 05:16 PM

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.