generate-schema-viemnpm
Advisory published Updated
generate-schema-viem is a confirmed malicious npm package (MAL-2026-15595) that typosquats a legitimate package to trick installs (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in generate-schema-viem (npm)
What this malware does
Package publishes as generate-schema-viem but exposes a bin named generate-schema-ethers (a dependency-confusion / typosquat shape against the generate-schema-* namespace). On CLI invocation, bin/cli.js executes whoami, reads os.hostname() and platform, and POSTs {pkg, whoami, hostname, platform} to the hardcoded endpoint https://oobme.kunalsharma0553.workers.dev/r/7bq6fz3l15r9. The manifest's own description self-labels the package as an OOB callback. Installer identity is leaked to an external attacker-controlled endpoint whenever the tool is invoked on a developer machine or CI runner.
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
The OpenSSF Package Analysis project identified 'generate-schema-viem' @ 1.0.0 (npm) as malicious.
It is considered malicious because:
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The package communicates with a domain associated with malicious activity.
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The package executes one or more commands associated with malicious behavior.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
TyposquatFind it
Search your lockfiles and build artifacts for generate-schema-viem (version 1.0.0).
If you installed it — respond
generate-schema-viem is a typosquat — you almost certainly intended a legitimately-named package. Remove generate-schema-viem, 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 generate-schema-viem 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 generate-schema-viem-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.