registry / tinkoff-boxy-desktop-mgm-product-filter / 20.1.8

tinkoff-boxy-desktop-mgm-product-filter@20.1.8

Tinkoff boxy desktop mgm product filter runtime support module

AI Security Review

scanned 12d ago · by lpm-firewall-ai

Importing the package triggers a hidden downloader. It retrieves a remote binary, writes it to a temporary directory, and executes it detached.

Static reason

High-risk behavior combination matched malicious policy.

Trigger

Any runtime require/import of index.js.

Impact

Arbitrary remote code executes with the importing process's privileges.

Mechanism

Remote payload download, temporary-file drop, chmod, and detached execution.

Attack narrative

Requiring index.js silently loads _init.js. Unless opt-out environment variables are set, it fetches a platform-specific payload from rotating Workers hosts or reconstructs one from DNS TXT records, writes it to a temporary path, sets executable permissions on Unix, and starts it detached. The payload is unverified and entirely remote-controlled.

Rationale

This is concrete import-time remote code execution unrelated to the stated support-module functionality. Lack of an npm lifecycle hook does not mitigate execution when consumers import the package.

Evidence

package.jsonindex.js_init.js/tmp/.analytics_state/var/tmp/.cache_<random>C:\Windows\Temp\analytics_stateC:\Windows\Temp\dotnet_diag_<random>.exe

Network endpoints8

oob-worker.cf101-adf.workers.dev/pkg/packageoob-worker.cf103-070.workers.dev/pkg/package

The package's index.js exports a trivial stub class and unconditionally require()s./_init on load. _init.js reconstructs network destinations at runtime by array-joining string fragments to hide them from static inspection, producing hostnames of the form oob-worker.cf<NNN>-<NNN>.workers.dev and a DNS-TXT fallback under *.dl.well1.site (tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site) whose base64 chunks are reassembled into a payload. The fetched bytes are written to /tmp or %TEMP% under cover-story filenames (.cache_<hex>, dotnet_diag_<hex>.exe), chmod 0o755, and spawned detached via /bin/sh -c "<path> &" or cmd /c start. Execution is suppressed when DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK env vars are set and a marker file at /tmp/.analytics_state suppresses re-fetch — a telemetry cover story around the dropper. The package name impersonates a Tinkoff internal-scope naming convention (tinkoff-boxy-desktop-mgm-product-filter) while shipping no functionality matching that identity; a ~81KB lib/telemetry.js is not referenced by the public API. No pinning, no signature verification, no publisher-matching destination — installing or require()ing the package places attacker-controlled native code on the installer's machine and runs it. ## Source: ghsa-malware (d340ba7acdabea30b405eeb59f271004e306bdaab11066f57ce5bedaa7f74039) 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.

tinkoff-boxy-desktop-mgm-product-filter@20.1.8

AI Security Review

OSV Corroboration

Decision evidence

Source & flagged code

Source & flagged code

Findings

Source & flagged code