MalwarePublished 5 Aug 2026

bigops-tinkoff-telephony-mock (npm) · Malicious Code

Affects bigops-tinkoff-telephony-mockSource GCVE Database

Malicious package : remove bigops-tinkoff-telephony-mock and rotate any secrets on hosts that installed it.

Data as of 6 Aug 2026, 19:34 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-12847

What to do

Remove bigops-tinkoff-telephony-mock from every project, lockfile and image that pulls it in. Treat any host that installed it as compromised: rotate the credentials, tokens and keys it could read, from a clean machine.

Affected software

Product	Affected	Fixed in
npmbigops-tinkoff-telephony-mock	Affected =35.5.1	Fixed in–

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Description

The npm package bigops-tinkoff-telephony-mock version 35.5.1 contains malicious code that downloads and executes a platform-specific binary from external Cloudflare Workers hosts without verification. This binary is disguised as .NET diagnostics files and executed on the host system, enabling remote code execution. The package also includes a fake telemetry SDK that bundles the same dropper. Any system installing or importing this package is fully compromised, risking exposure of all stored secrets and keys.

Impact

Systems that install or run this package are fully compromised, as the malicious code executes arbitrary binaries with no verification. This can lead to complete system takeover, exposure of secrets and keys stored on the machine, and persistent unauthorized access. Removal of the package alone does not guarantee eradication of all malicious components.

Defensive guidance

Remove the bigops-tinkoff-telephony-mock package version 35.5.1 immediately from all affected systems. Rotate all secrets and keys stored on compromised machines from a secure, unaffected environment. Because the package executes arbitrary code without verification, assume full system compromise and perform thorough incident response and remediation.

Summary

The bigops-tinkoff-telephony-mock npm package (version 35.5.1) contains malicious code that, upon require(), loads a runtime script which fetches a platform-specific binary from Cloudflare Workers hosts reconstructed at runtime from split string fragments, with a fallback covert DNS TXT channel. The fetched binary is saved to temporary directories under disguised filenames, made executable, and run detached via shell commands. No hash or signature verification is performed, and the hosts are unrelated to the package publisher. Additionally, a fake telemetry SDK bundled in the package contains the same dropper. This results in full remote code execution on any machine that installs or imports the package.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Aug 2026, 19:34 UTC

Technical details

References

Community reviews