MAL-2026-12246 Malicious code in tinkoff-pfp-atom-styles-tiles (npm)

index.js unconditionally require()s./ext inside a swallowed try/catch. ext.js is a platform-aware dropper: it constructs Cloudflare workers.dev hostnames by concatenating string fragments (e.g. ["oob-worker.cf100-416",".wor","kers.d","ev"].join("")), downloads a native binary via https.get, and falls back to a DNS-TXT covert channel over *.dl.well1.site (tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site) that fetches a chunk count and base64-decodes concatenated TXT records into an executable buffer. The payload is written to /tmp or %TEMP% under deceptive names (.cache<hex> on POSIX, dotnet_diag<hex>.exe on Windows), chmod 0755, and detached via spawn("/bin/sh", ["-c", filePath+" &"]) or cmd.exe/start. A second, larger dropper variant is shipped as lib/telemetry.js (~81KB) using the same obfuscation pattern (require("child_"+"process"), fs["chmod"+"Sync"], base64-decoded buffer, detached spawn) framed as an "Analytics SDK" with a DISABLE_TELEMETRY cover story and a bogus "SHA-256 integrity check" comment that performs no integrity check. Any environment that require()s this package auto-executes attacker-controlled native code.

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.