@greenlake/sessionnpm
Advisory published Updated
@greenlake/session is a confirmed malicious npm package (MAL-2026-18283) that opens a backdoor for remote access (malicious versions 1.0.0, 2.0.0, 3.0.0…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in @greenlake/session (npm)
What this malware does
@greenlake/session is a dependency-confusion package: it is described as a "Compatibility shim", uses inflated version numbers, and its README calls it an "authorized dependency-confusion test". Each listed version (3.0.0, 99.0.1, 1.0.0, 2.0.0) has a postinstall script that runs node beacon.cjs on npm install, and index.js calls the same code when the package is imported; it POSTs the hostname, install path and current working directory over plain HTTP to http://185.158.107.175:8787/_ah/dc, and index.js exports a Proxy that returns no-op functions so builds importing the real package keep running. The npm account wiseke published 14 such packages under the @greenlake, @sxm-web, @drone-js-ext and @ppa-web-components scopes between 2026-10-23 21:23 and 2026-10-25 14:28 UTC; index.js is byte-identical to that of ph-common (MAL-2026-1809), which sends to the same endpoint.
The package is a near-empty shim whose only functional behavior is a beacon. beacon.cjs defines a hardcoded bare-IP HTTP endpoint (http://185.158.107.175:8787/_ah/dc) and a fire() routine that POSTs installer-side host identifiers to it: package name, os.hostname(), __dirname (install path), process.cwd(), and process.version. fire() is invoked from the postinstall lifecycle script, so it runs automatically on npm install, and also from the main entry, so it runs again on require('@greenlake/session'). The main export is a Proxy that returns a no-op for every property access, so the package provides no legitimate functionality. The README self-labels this as an authorized dependency-confusion test against an internal @greenlake scope, but that is author-controlled text and does not constitute consent from any other installer whose resolver pulls this public package in place of the intended internal one. The data path is unencrypted (plain HTTP) and the destination is a bare IP unrelated to any declared publisher infrastructure.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Backdoor / remote accessFind it
Search your lockfiles and build artifacts for @greenlake/session (4 malicious versions).
If you installed it — respond
@greenlake/session 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 @greenlake/session 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
- InvisiRisk, Inc. · finder
Detect & block this
O3 blocks @greenlake/session-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.