MAL-2026-16097 Malicious code in twilio-hackerone-poc-b8f21a (npm)

On npm install, postinstall.js automatically executes and performs host reconnaissance and exfiltration to a hardcoded ephemeral Cloudflare Quick Tunnel at https://encryption-watch-tubes-finger.trycloudflare.com/poc-v101-escape. The script runs id, whoami, and uname; enumerates /, $HOME, and /tmp; reads /proc/self/cgroup and /proc/mounts; probes the AWS instance-metadata service at 169.254.169.254 and the ECS task-metadata agent at 127.0.0.1:51678 and reports reachability; enumerates other AC[0-9a-f]{32} Twilio account SID directories present in /tmp (excluding one hardcoded SID) to enumerate co-tenants on shared build workers; and collects Object.keys(process.env). All of the above is POSTed as JSON to the trycloudflare.com tunnel. The tunnel host is anonymous, ephemeral, and unrelated to any legitimate publisher; the package name and self-labeling as a 'HackerOne PoC' do not change the observed installer-side data-exfiltration behavior.