MAL-2026-4255 Malicious code in cdk-sagemaker-notebook-workflow (npm)

The package declares a preinstall hook (node index.js) in package.json that fires automatically on npm install. The script collects os.hostname(), os.userInfo().username, os.platform(), current working directory, home directory, the contents of /etc/passwd (fs.readFileSync('/etc/passwd', 'utf8')), and the first 30 entries of process.env (Object.entries(process.env).slice(0, 30)), then POSTs the JSON payload to https://3nrgzlqwix6erldow0s0kttsojuai36s.oastify.com/greengrass/<execId> — a Burp Collaborator-style OAST host. Bulk env-var enumeration on CI runners typically captures AWS_SECRET_ACCESS_KEY, GITHUB_TOKEN, NPM_TOKEN, and similar credentials. The package name impersonates the AWS CDK construct namespace (cdk-sagemaker-notebook-workflow) and the README contains the string Takeover By l0bo, confirming attacker intent. This is an unambiguous install-time credential and host-data exfiltrator with a typosquat lure on the AWS CDK ecosystem.

The OpenSSF Package Analysis project identified 'cdk-sagemaker-notebook-workflow' @ 2.0.5 (npm) as malicious.

It is considered malicious because:

• The package communicates with a domain associated with malicious activity.

• The package executes one or more commands associated with malicious behavior.