MAL-2026-10700 Malicious code in time-format-kit (npm)

On npm install, the package's postinstall script decodes base64-encoded shell payloads and executes them via an obfuscated child_process.exec lookup (require('ch'+'il'+'d_p'+'rocess')['e'+'xec']). The shell payload reads ~/.aws/credentials, ~/.ssh/id_rsa, ~/.ssh/authorized_keys, ~/.ssh/known_hosts, ~/.bash_history, the full process environment, and host identifiers (hostname, whoami, id, sudo -l), then POSTs the base64-encoded contents over plain HTTP to a hardcoded Burp Collaborator subdomain at pwpzhsrbtvmfqrqr7onqcwnrcii960up.oastify.com. Additional payloads issue curl requests through the installer host to http://tst.woa.com/flag.html and http://tst.woa.com/ssrf_forward.php with an oastify-subdomain host parameter, and POST the response bodies back to the same collaborator endpoint, using the installer as an SSRF relay. The package name ('time-format-kit') has no functional relationship to the observed behavior.

The OpenSSF Package Analysis project identified 'time-format-kit' @ 1.0.2 (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.