npm · Malicious package advisory
Malware@marketfront/changefilter
GHSA-3r3h-jfq7-3v54
Malicious code in @marketfront/changefilter (npm)
Details
**Severity:** Critical **Affected versions:** `> 0` The @marketfront/changefilter package is part of a 25-package malicious campaign batch-published to the @marketfront npm scope by npm user 'marketfront' ([email protected]) within a roughly 3-minute window on 2026-07-01. All packages in the campaign were published at version 7.0.0 and use e-commerce/marketing frontend component names as cover. The package declares a postinstall hook (node scripts/postinstall.js) that executes heavily obfuscated (obfuscator.io-style) code automatically at npm install time. Static analysis of the decoded payload revealed a credential harvester that dynamically requires fs, os, http, https, zlib, path and dns, then reads approximately 20 sensitive credential files including ~/.ssh, ~/.aws/credentials, ~/.kube/config, ~/.docker/config.json, ~/.npmrc, ~/.netrc, ~/.pgpass, ~/.git-credentials, ~/.env and ~/.bash_history. Collected data is exfiltrated via a gzip-compressed HTTPS POST with a custom X-Secret header to the path /api/v1/events, alongside a DNS resolver beacon. The command-and-control host is concealed behind an additional RC4+XOR encryption layer around an embedded configuration blob and was not statically resolved. The decoded behavioral payload (module requires, credential-file target list, exfiltration headers and endpoint) is byte-for-byte identical across sampled packages in the campaign. The campaign shares tooling and infrastructure patterns (obfuscated postinstall credential harvester, X-Secret header, /api/v1/events exfiltration path, RC4-concealed C2) with the earlier @emcd-vue campaign, indicating the same actor rotating scopes and disposable maintainer emails. --- Credit: [OpenSSF](https://github.com/ossf/malicious-packages) ([source](https://github.com/ossf/malicious-packages/blob/e2502f82b73309433273f633ce82a262dccf6cbe/osv/malicious/npm/@marketfront/changefilter/MAL-2026-6770.json)) **References:** - https://github.com/ossf/malicious-packages/blob/e2502f82b73309433273f633ce82a262dccf6cbe/osv/malicious/npm/@marketfront/changefilter/MAL-2026-6770.json - https://safedep.io/marketfront-dependency-confusion-campaign - https://github.com/advisories/GHSA-3r3h-jfq7-3v54
Compromised versions (1)
- > 0
Any computer that installed or ran a compromised version should be considered fully compromised. Rotate every secret on that machine from a clean environment.