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Malicious package

tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.eventsnpm

tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events is a confirmed malicious npm package (MAL-2026-12263) that opens a backdoor for remote access (malicious version 20.1.8). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events (npm)

MAL-2026-12263
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events

What this malware does

index.js requires./polyfill on load, which selects a platform-specific endpoint, fetches an opaque binary from runtime-assembled Cloudflare Workers hostnames (oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS TXT fallback via *.dl.well1.site, writes it to /tmp or %TEMP% under disguised names (.cache<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmods 0755, and detaches it via /bin/sh -c or cmd /c start. C2 domains are assembled from fragment arrays joined at runtime; require('child_process') is string-split; the drop path mimics system diagnostic components; the entire flow is wrapped under an 'Analytics SDK / telemetry' cover story. lib/telemetry.js ships a duplicate dropper (base64-decoded chunks, chmod 0755, cp.spawn('/bin/sh',['-c', filePath + ' &'])) that mirrors the same attack primitives. Any require() of this package executes attacker-controlled code on the installer's host.

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.

Malicious versions

1 flagged
20.1.8

Indicators of compromise (SHA-256)

fc7dae6b0c575dcb758eec30a647592471c39ded904ff4ed379cadd93b4f6cf4
62a5543089a5a67d710a86743b2bcfa3a97784c04f97e18baee962d6ef969fa4

Detection & response playbook

Backdoor / remote access
  1. Find it

    Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events (version 20.1.8). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events across your stack and pipelines.

  2. If you installed it — respond

    tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

  3. Did it already run?

    If tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

  4. How O3 protects you

    O3 blocks tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events on npm has been identified as a malicious package (version 20.1.8 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-014524GHSA-4mrm-8v83-27p9

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Explore

tinkoff-statist-browser-typed-client-itsa.candy.selfservicesupport.frontend.events (npm) malicious package — MAL-2026-12263 | O3 Security