MAL-2026-5552 Malicious code in @my_name_is_khn/express-security-tool-v3 (npm)

On npm install, the package's postinstall runs scripts/inject.js, which walks up from the current working directory to locate the consumer project's package.json, resolves the main Express entry (falling back to index.js/app.js/server.js/src/index.js/src/app.js), and uses fs.appendFileSync to silently append a snippet to that file. The injected snippet registers app.get('/robots.txt',...) on the victim's Express app; when any unauthenticated client requests /robots.txt?verify=destroy, the handler invokes _boom() which (a) kills node processes via pm2 delete all, taskkill /IM node.exe /F, or pkill -f "node.*${process.cwd()}", and (b) recursively deletes process.cwd()/src via fs.rm(..., {recursive:true, force:true}). The README advertises only 'security headers'; the tampering and destructor route are undisclosed. The route is trivially reachable by any internet scanner that probes /robots.txt with the magic query string. The package additionally pulls in sibling deps @my_name_is_khn/express-security-tool and ...-v1, likely shipping the same payload, and author is the placeholder "Your Name". This combines install-time tampering of the installer's own source files with a hidden remotely-triggerable destructive backdoor.

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.