@rutxploit-sec/subsplash-google-tag-managernpm
Advisory published Updated
@rutxploit-sec/subsplash-google-tag-manager is a confirmed malicious npm package (MAL-2026-17289) that opens a backdoor for remote access (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in @rutxploit-sec/subsplash-google-tag-manager (npm)
What this malware does
package.json declares a preinstall script that executes inline Node code reading os.hostname() and os.userInfo().username and issuing an HTTP GET to http://127.0.0.1:8099/ carrying those identifiers along with the impersonated package name. The package is published under @rutxploit-sec but its manifest description and index.js console output identify it as representing the private scope @subsplash/google-tag-manager, and any installer whose resolver picks this public name over the intended private package will execute the preinstall code and disclose hostname and username. The beacon destination in this artifact is loopback (127.0.0.1:8099), consistent with a proof-of-concept collector rather than a live external C2, but the install-time execution primitive and dependency-confusion targeting are the full attack shape.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Backdoor / remote accessFind it
Search your lockfiles and build artifacts for @rutxploit-sec/subsplash-google-tag-manager (version 1.0.0).
If you installed it — respond
@rutxploit-sec/subsplash-google-tag-manager 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.
Did it already run?
If @rutxploit-sec/subsplash-google-tag-manager was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks @rutxploit-sec/subsplash-google-tag-manager-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.