If this package is installed
Remove it, treat the machine (or CI runner) as compromised, and rotate every secret, token and key it could access — from a different, clean machine.
Details
Source: amazon-inspector (2242b683433d5fe37b3997185d251799a4606a456e516da08586775d11f0cb7e)
@gsas/gsas-sdk@999.9.15 is a high-version public-registry squat targeting an internal `@gsas/gsas-sdk` name. package.json declares `preinstall: node index.js`, and index.js runs on install to collect the installer's hostname, username, home directory, cwd, local/public/resolver IPs, npm registry URL, CI platform with repo/actor/run/workflow/runner, AWS region, git email domain, and the consuming project's name/author/repo/homepage. It also spawns `gh api user --jq.login`, `npm whoami`, and `git config user.email` to capture the developer's authenticated GitHub login, npm login, and email. The collected JSON is hex-encoded, split into 60-character chunks emitted as DNS subdomain queries under `da51rv0hb2uc72tg4gvgdepinjcallbk1.oast.fun`, and additionally POSTed over HTTP and HTTPS to the same host (path `/poc/<uuid>`). Public-IP discovery calls out to api.ipify.org, icanhazip.com, and ifconfig.me. Comments in the file describe the multi-channel design as intended to survive corporate egress filtering. An `AUTHORISED SECURITY RESEARCH` self-label appears in the source but does not correspond to installer consent.
Source: ghsa-malware (b4a4d5478af3008f72fc2e26628a07c123a391012d1e7aa4e3237ba81f195865)
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.