MalwarePublished 12 Aug 2026

biklimaster (npm) · Malicious Code

Affects biklimasterSource GCVE Database

Malicious package : remove biklimaster and rotate any secrets on hosts that installed it.

Data as of 12 Aug 2026, 17:00 UTC

Classification

Malicious package

Published to npm · OSV MAL-2026-13786

What to do

Remove biklimaster 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
npmbiklimaster	Affected =1.1.4 =1.0.0 =1.1.3	Fixed in–

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Description

The biklimaster npm package contains malicious code that, upon installation on Windows, creates a hidden local administrator account with a known password and enables Remote Desktop Protocol (RDP) access with insecure settings. This includes disabling Network Level Authentication and enabling session shadowing without user consent. The package executes unsigned Windows binaries to patch system files and configure the system for remote access. Because the admin password is publicly known and the package is publicly available, any system with this package installed is at high risk of compromise.

Impact

Systems with the biklimaster package installed are fully compromised due to the creation of a hidden administrator account with a known password and insecure RDP configuration. This allows attackers remote access with administrative privileges without user consent or authentication protections. All secrets and keys stored on such systems should be considered compromised and rotated immediately. Removing the package does not guarantee removal of all malicious modifications or backdoors.

Defensive guidance

The package should be immediately removed from all affected systems. Because the compromise includes persistent backdoors and system modifications, affected systems should be considered fully compromised. It is recommended to perform a full system rebuild or forensic analysis to ensure removal of all malicious components. All credentials and secrets stored on the compromised systems must be rotated from a secure, unaffected environment.

Summary

The biklimaster npm package's postinstall hook executes a script that prompts for UAC elevation and then configures the Windows host to be remotely accessible by attackers. It creates or enables a local administrator account with a hardcoded password ('Hacker@1290'), adds it to administrative and Remote Desktop user groups, and hides it from the login screen. Registry settings are modified to enable Remote Desktop on port 3389, disable Network Level Authentication, and allow session shadowing without user consent. Unsigned executables bundled with the package are silently executed to patch system files (termsrv.dll) via RDP Wrapper. The package is publicly published on npm, exposing the hardcoded credentials to anyone installing it, effectively compromising any affected system.

References

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What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Aug 2026, 17:00 UTC

Technical details

References

Community reviews