MAL-2026-5535 Malicious code in zer0onedate (npm)

On npm install, postinstall.js executes a chain of curl commands that read cloud instance metadata service (IMDS) endpoints — AWS (169.254.169.254/latest/meta-data/iam/security-credentials/), Alibaba/Aliyun and Tencent metadata hosts, plus 100.100.100.200 and 169.254.0.23 — and writes the responses to /tmp/aws.txt, /tmp/ali.txt, /tmp/meituan.txt. It also probes an internal-looking SSRF endpoint at https://mtsrc-test.sankuai.com/ssrf and lists /data/. The aggregated contents are POSTed via curl -X POST -d to http://h4mx6b7krgzarfehbutwabxbu20tojc8.oastify.com/metadata, an attacker-controlled Burp Collaborator subdomain. Any installer running in AWS/Aliyun/Tencent cloud (CI runners, build agents, cloud dev VMs) leaks temporary IAM credentials from IMDS to the attacker, who can then pivot into the victim's cloud account. The targeting of Meituan-internal infrastructure (sankuai.com) plus multiple non-standard cloud metadata IPs indicates deliberate reconnaissance, not opportunistic theft.