MAL-2026-17158 Malicious code in simple-date-formatter-new-11 (npm)

Package presents itself as a date-formatting utility but performs credential theft against the installer through two channels. The postinstall script in package.json curls cloud instance-metadata endpoints (Alibaba 100.100.100.200, AWS 169.254.169.254, and Tencent Cloud) and a /data/ listing, writes them to /tmp, and POSTs the concatenated contents to an attacker-controlled OAST collector at pdxkwzizhzzdpzpgcieqk6d1v7ynqsgfo.oast.fun/metadata — harvesting cloud IAM/instance credentials from any cloud VM or CI runner that installs the package. Separately, index.js (the package main) enumerates ~/.ssh on require, packages the username, platform, and key filenames as JSON, and POSTs the payload over HTTPS to the hardcoded remote host 124.221.154.135:443/post, so importing the module leaks SSH key metadata to a fixed attacker endpoint. The advertised formatDate functionality is a stub unrelated to the exfiltration paths.