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Malicious package

eslint-plugin-mistica-local-rulesnpm

Malicious code in eslint-plugin-mistica-local-rules (npm) Remove it immediately and rotate any exposed credentials.

MAL-2026-5703
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall eslint-plugin-mistica-local-rules

What this malware does

package.json declares a preinstall hook that runs index.js automatically on npm install. index.js collects host identity (os.hostname(), os.platform(), os.arch(), os.userInfo() including uid/gid, shell, homedir, cwd) and the output of whoami and id via child_process, then POSTs the JSON payload to the hardcoded URL https://eucfugc8bk66haszliir75yd74dv1lpa.oastify.com/detox56 (a Burp Collaborator subdomain). The package ships no eslint rule implementation — its only effect on install is the recon/exfiltration beacon. The package name eslint-plugin-mistica-local-rules mimics the Telefónica Mistica design-system internal eslint-plugin namespace, consistent with a dependency-confusion attack against private-registry consumers.

Malicious versions

1 flagged
19.12.11

Indicators of compromise (SHA-256)

72d5fe15c6bf5a8084dd7cb92869cfe7d7c8a667581dd8ba8c0de403bcfeff57
c1d21f50741178986b63d1f330373131c2f3f502a5b94e76ca921ce185fab123

Frequently asked questions

No. eslint-plugin-mistica-local-rules on npm has been identified as a malicious package (version 19.12.11 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-005836IN-MAL-2026-005835

References

Credits

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eslint-plugin-mistica-local-rules (npm) malicious package — MAL-2026-5703 | O3 Security