insomnia-test-util-m4gesternpm
Malicious code in insomnia-test-util-m4gester (npm) Remove it immediately and rotate any exposed credentials.
What this malware does
Package ships no functional code and exists solely to execute a shell command on npm install. The postinstall lifecycle hook runs echo PWNED_BY_DEEPLINK > /tmp/pwned.txt, dropping a marker file at /tmp/pwned.txt on the installer's machine. The self-identifying marker string (PWNED_BY_DEEPLINK) confirms the package's only purpose is to demonstrate arbitrary install-time code execution against installers. The package name mimics the Insomnia (Kong) HTTP-client ecosystem naming convention while the publishing handle is unrelated, consistent with a lure/PoC namespace-abuse shape. Although the present payload is a benign marker write, the install-time arbitrary-command-execution primitive is fully wired and would execute any command the maintainer publishes in a future version.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
TyposquatFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for insomnia-test-util-m4gester (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-test-util-m4gester across your stack and pipelines.
If you installed it — respond
insomnia-test-util-m4gester is a typosquat — you almost certainly intended a legitimately-named package. Remove insomnia-test-util-m4gester, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.
Did it already run?
If insomnia-test-util-m4gester 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-test-util-m4gester 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-test-util-m4gester-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.