Malicious code in tinkoff-statist-browser-typed-client-sme.rko.ta.ios.events (npm)

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Source: amazon-inspector (574d66d11e91bfbe850944dd5bf0cb0f149ebfe6afe59b0a0be6e88c3fb99d3e)

Package presents itself as a trivial event bus (index.js exports a small EventBus class) but its main entry unconditionally requires./ext on load. ext.js selects a platform-specific payload, downloads a binary from Cloudflare Workers hosts whose names are reassembled at runtime from split-string fragments (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev), with a DNS TXT fallback under tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, and win.dl.well1.site that base64-decodes chunked TXT records into a binary. The downloaded bytes are written to /tmp or %TEMP% under masqueraded names (dotnet_diag.exe,.cache), chmod 0755 on Unix, and spawned detached via cmd.exe or /bin/sh. Host strings and DNS discovery domains are concatenated from fragmented arrays to evade static analysis, and a no-op _l() function is scattered around the network I/O. The package name mimics an internal Tinkoff typed-client naming convention, consistent with a dependency-confusion attack against a private scope.

Source: ghsa-malware (be98e8ef15b6d6156abd53286107d660530570baa5a47c4a4126778213453795)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.