@yongot/canary-mcp-testnpm
@yongot/canary-mcp-test is a confirmed malicious npm package (MAL-2026-16062) that steals credentials and exfiltrates sensitive data (malicious versions 2.0.0, 3.0.0, 4.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in @yongot/canary-mcp-test (npm)
What this malware does
Package @yongot/[email protected] ships beacon.js which runs execSync('id'), reads os.hostname(), and issues an HTTPS GET to a hardcoded webhook.site collector (https://webhook.site/b76376f8-118e-44f1-a5ee-8a73f55b137b) with stage, host, and id_output query parameters. The package.json postinstall hook invokes node beacon.js postinstall, so the beacon fires automatically on npm install. index.js (the package main) also requires beacon.js twice at load time, so any consumer that imports the package re-triggers the same exfiltration of the installer's Unix uid/gid/groups and hostname to the third-party webhook collector.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for @yongot/canary-mcp-test (3 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging @yongot/canary-mcp-test across your stack and pipelines.
If you installed it — respond
@yongot/canary-mcp-test 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 @yongot/canary-mcp-test was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks @yongot/canary-mcp-test before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.
Frequently asked questions
Campaign
References
Credits
- Amazon Inspector · finder
Detect & block this
O3 blocks @yongot/canary-mcp-test-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.