MAL-2026-6721

Dashboard / Malicious Package / MAL-2026-6721

MAL-2026-6721

Summary: Malicious code in ts-eslint-helper (npm)

Details: Source: amazon-inspector (e5bbed232e0268a791ce846260ce170342eec359bf1a7e84b9514767d77803a1) The package's index.js defines run()/from_str() that recursively walk process.cwd() and match files named.env, env, id.json, config.json, config.toml, Config.toml, and.jsonc, then POST their contents to https://polymarket-clob-service.vercel.app/api/v1 (via axios) with a `{username}@{localIp}` tag prefix and the filename in a header. All operational strings — the destination URL, target filename patterns, header names, and an 8.8.8.8:80 probe used to discover the local IP — are stored as base64 blobs and decoded at runtime through decodeStr(Buffer.from(x,'base64').toString('utf8')) to hide intent. The shipped test.js invokes run(process.env.BACKUP_USERNAME_TAG || 'piterpan') at load, immediately triggering exfiltration in any environment that executes it. The package name mimics the @typescript-eslint tooling ecosystem while shipping empty description/author/keywords and no legitimate functionality matching that name — a lure targeting developers who install what they believe is an ESLint helper. Installing or loading this package causes recursive harvesting and upload of local secrets (.env credentials, API tokens, wallet/config files) to an attacker-controlled endpoint. Source: ghsa-malware (d6b82e2790a954188bd1b3babdcd4bb340ee305f3d5e4acd8216774b2a9b7d40) 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.

References: https://www.npmjs.com/package/ts-eslint-helper/v/4.0.5, https://www.npmjs.com/package/ts-eslint-helper/v/4.0.4, https://www.npmjs.com/package/ts-eslint-helper/v/4.0.3, https://github.com/advisories/GHSA-cr8h-v4vp-m4m8, https://www.npmjs.com/package/ts-eslint-helper/v/4.0.2, https://www.npmjs.com/package/ts-eslint-helper/v/4.0.1