MAL-2026-12195 Malicious code in simple-date-formatter-new-3 (npm)

The package's postinstall script in package.json runs a shell pipeline that collects host and container-runtime information (kernel version via uname -r, /proc/1/cmdline, /proc/1/ns, root filesystem listing, block device listing) and POSTs the output via curl to the hardcoded interact.sh-style callback http://safjhdvsfwzhieemkdzbgr54r0yjhrmok.oast.fun/escinfo7. The same pipeline attempts container-escape actions: creating a cgroup subtree under /sys/fs/cgroup/esc7, moving PID 0 into it, mknoding a block device at /tmp/x17, and mounting the host root filesystem at /tmp/hostroot, with results reported back to the same external endpoint. The tarball also ships a postinstall.js that enumerates the installer's ~/.ssh directory and POSTs the listing plus username/platform to the hardcoded IP 124.221.154.135:443/post, with in-source comments describing the behavior as SSH-key C2 exfiltration. All of this runs automatically on npm install with no user consent. The package name and stated purpose ("date formatter") do not match any of the observed behavior.