insomnia-plugin-poc-m4gester2npm
Malicious code in insomnia-plugin-poc-m4gester2 (npm) Remove it immediately and rotate any exposed credentials.
What this malware does
Package ships only a package.json with no plugin code, declaring a postinstall lifecycle script that runs echo PWNED_BY_DEEPLINK > /tmp/pwned.txt on every npm install. This writes a marker file to the installer's filesystem and demonstrates arbitrary command execution at install time. The package name self-identifies as a proof-of-concept (poc-m4gester) and adopts the insomnia-plugin-* namespace despite shipping no Insomnia plugin functionality. While the current payload is a benign marker write, the postinstall is an arbitrary-shell-on-install primitive with no legitimate purpose, in a namespace-squat shell of a package.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for insomnia-plugin-poc-m4gester2 (2 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging insomnia-plugin-poc-m4gester2 across your stack and pipelines.
If you installed it — respond
Remove insomnia-plugin-poc-m4gester2 from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If insomnia-plugin-poc-m4gester2 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 insomnia-plugin-poc-m4gester2 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 insomnia-plugin-poc-m4gester2-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.