MAL-2026-18417: Malicious code in ssite-mock-server (npm)

ssite-mock-server is a dependency-confusion package with no functional code (its description is "Authorized Test Package"). Its postinstall script runs node ./index.cjs on npm install, which POSTs the hostname, home directory, platform and CI provider (GitHub Actions, GitLab CI, Azure Pipelines or Jenkins) to https://130.162.231.177:8443/. It was published by the npm account notsemz, which published two more packages with the same beacon on 2026-10-29 and seven placeholder-only names.

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Source: ghsa-malware (b78321d5059e11bc71690bbb965780622cd835221d353fecb34eb51ee2e9716e) 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.