zer0one-dnslognpm
Advisory published Updated
zer0one-dnslog is a confirmed malicious npm package (MAL-2026-5366) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.0, 1.0.1, 1.0.2…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in zer0one-dnslog (npm)
What this malware does
The package is published as a 'simple date formatting utility' but ships a postinstall payload that, on npm install, runs a curl pipeline against cloud instance-metadata services to harvest temporary IAM credentials and internal SSRF data, then POSTs the collected output to an attacker-controlled out-of-band host. Specifically, postinstall.js issues curls to AWS metadata at 169.254.169.254 (IAM security-credentials path), Aliyun at 100.100.100.200, Tencent at metadata.tencentyun.com / 169.254.0.23, and Meituan-internal mtsrc-test.sankuai.com, writes the responses to /tmp/aws.txt, /tmp/ali.txt, /tmp/tx.txt, /tmp/tx2.txt, and uploads them via curl -X POST to https://h4mx6b7krgzarfehbutwabxbu20tojc8.oastify.com/metadata along with a listing of /data/. package.json declares "postinstall": "node postinstall.js", so the harvest fires automatically on default install. On any cloud build host or CI runner this leaks role credentials with full AWS/Aliyun/Tencent access. The advertised purpose mismatches the shipped behavior (index.js is a one-line hello stub), confirming the package is a lure for credential theft, not a date utility.
The OpenSSF Package Analysis project identified 'zer0one-dnslog' @ 1.0.0 (npm) as malicious.
It is considered malicious because:
- The package executes one or more commands associated with malicious behavior.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for zer0one-dnslog (10 malicious versions).
If you installed it — respond
zer0one-dnslog is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If zer0one-dnslog was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
- OpenSSF: Package Analysis · finder
Detect & block this
O3 blocks zer0one-dnslog-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.