{"id":"MAL-2026-6786","summary":"Malicious code in @marketfront/mychatspreloader (npm)","details":"The @marketfront/mychatspreloader package is part of a 25-package malicious campaign batch-published to the @marketfront npm scope by npm user 'marketfront' (marketfront@tutamail.com) 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.\n\nThe 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.\n\nThe 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.\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (c37e62bf76544bbc506f0806596054cf60d6c7e4ae8f990a804407c46417224a)\nThe package ships a heavily obfuscated postinstall.js (obfuscator.io-style: rotated string array of length 213, RC4/base64 decoders, numeric-charcode arrays decoded at runtime) that runs automatically on `npm install`. On execution it enumerates the entire `process.env`, collects OS identifiers via `os.hostname()`, `os.userInfo()`, `os.networkInterfaces()`, and `os.cpus()`, and reads Windows-specific environment variables (USERDOMAIN, COMPUTERNAME, APPDATA, LOCALAPPDATA, TEMP, PROGRAMDATA). It then reads files under the user's APPDATA/LOCALAPPDATA/TEMP/PROGRAMDATA directories — where browser profiles, wallet stores, and app credential files reside on Windows — and includes their contents in the outbound payload. The collected data is exfiltrated over two channels: an HTTPS POST and DNS-subdomain queries via `dns.Resolver` (a classic DNS-tunnel exfil channel used to bypass HTTP egress filtering). The package has no library functionality: `main` points to `dist/index.js` which requires `../src/index.js`, and no `src/` directory is shipped in the tarball — the only effect of installing the package is the malicious postinstall. The `@marketfront` scope and README (referencing marketfront.io / npm.marketfront.io / jira.marketfront.io as an internal registry) present a dependency-confusion cover story targeting an organization that expects a private `@marketfront/*` package from an internal registry.\n","modified":"2026-07-06T05:16:46.673082216Z","published":"2026-07-02T00:00:00Z","database_specific":{"malicious-packages-origins":[{"versions":["7.0.0"],"sha256":"c37e62bf76544bbc506f0806596054cf60d6c7e4ae8f990a804407c46417224a","import_time":"2026-07-06T04:58:11.023284688Z","source":"amazon-inspector","id":"IN-MAL-2026-008033","modified_time":"2026-07-06T03:21:20Z"}]},"references":[{"type":"REPORT","url":"https://safedep.io/marketfront-dependency-confusion-campaign/"},{"type":"PACKAGE","url":"https://www.npmjs.com/package/@marketfront/mychatspreloader/v/7.0.0"}],"affected":[{"package":{"name":"@marketfront/mychatspreloader","ecosystem":"npm","purl":"pkg:npm/%40marketfront%2Fmychatspreloader"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"versions":["7.0.0"],"database_specific":{"indicators":{"evidence_files":[{"tlsh":"a2f3eb892744d447d85fdfbfbe61e6e4e1297cc6c3c1244ef714b92cf89842aaa58780","path":"scripts/postinstall.js","sha256":"944033b857cc0dcfc5dd375adaefbc0f8c615a57486cca5a1be9f8d47f421aeb"},{"tlsh":"73118c32c5258c3372c56a9aed751e42b9a6195f0c89fc1962c3502c4bce0a750fda3e","path":"package.json","sha256":"816e2bda71ae53c238fcfa4656ee465ad749be2d3298f0233211551639cda6aa"}],"package_integrity":[{"hashes":{"sha1":"46bf8d1fd605d17e75845f712ad8c176ce7baa45","sha512_sri":"sha512-V/9tj3A/irQkIdHK0Egx8S8HWZMQdbqd/CnyZHJv6gIVAkc1pSDO65pIjyrjML+OytAeWnndrMXNjSWo4g8ROw=="},"filename":"mychatspreloader-7.0.0.tgz"}]},"cwes":[{"description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code","cweId":"CWE-506"},{"description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code","cweId":"CWE-506"}],"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@marketfront/mychatspreloader/MAL-2026-6786.json"}}],"schema_version":"1.7.5","credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"},{"name":"SafeDep","contact":["https://safedep.io"],"type":"FINDER"}]}