{"id":"MAL-2026-6772","summary":"Malicious code in @marketfront/customdealsfeed (npm)","details":"The @marketfront/customdealsfeed 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 (dcdb247433e08e6bcd6ad2d50beedf663648e089d745d4608959d0e42efac2af)\nThe package has no legitimate runtime surface: package.json 'main' re-exports../src/index.js which is not shipped in the tarball, so require() throws. The only executed code is scripts/postinstall.js, a ~165KB obfuscator.io-style payload that runs automatically on npm install. It uses a string-array decoder plus RC4 and XOR routines to hide its behavior, and contains a sandbox-evasion guard that suppresses execution when NODE_OPTIONS or the package name match hardcoded analysis-environment values. At install time the decoded payload collects host and account identity (os.userInfo, hostname, platform, arch, network interfaces), enumerates environment variables (including USERDOMAIN, COMPUTERNAME, APPDATA, LOCALAPPDATA, TEMP, PROGRAMDATA, npm_config_user_agent and a full process.env dump), executes shell commands via child_process, and reads candidate credential/wallet/keystore files under APPDATA/LOCALAPPDATA/TEMP/PROGRAMDATA using a JSON key/value walker. The collected data is bundled into an encrypted JSON blob and transmitted over HTTPS to a hardcoded endpoint, with a DNS side-channel that splits ciphertext into ~50-character chunks encoded as sub.sub.HOST queries to bypass egress filtering. The @marketfront scope and README instruction to add 'registry=https://npm.marketfront.io' to.npmrc — pointing at non-existent infrastructure — is a dependency-confusion lure targeting organizations that have not correctly pinned an internal scope, with a fake 'anonymous telemetry to telemetry.marketfront.io' cover story pre-authorizing the observed network activity.\n","modified":"2026-07-06T05:16:47.856441719Z","published":"2026-07-02T00:00:00Z","database_specific":{"malicious-packages-origins":[{"versions":["7.0.0"],"sha256":"dcdb247433e08e6bcd6ad2d50beedf663648e089d745d4608959d0e42efac2af","modified_time":"2026-07-06T03:19:45Z","id":"IN-MAL-2026-008022","import_time":"2026-07-06T04:58:10.520826654Z","source":"amazon-inspector"}]},"references":[{"type":"REPORT","url":"https://safedep.io/marketfront-dependency-confusion-campaign/"},{"type":"PACKAGE","url":"https://www.npmjs.com/package/@marketfront/customdealsfeed/v/7.0.0"}],"affected":[{"package":{"name":"@marketfront/customdealsfeed","ecosystem":"npm","purl":"pkg:npm/%40marketfront%2Fcustomdealsfeed"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"versions":["7.0.0"],"database_specific":{"indicators":{"package_integrity":[{"hashes":{"sha512_sri":"sha512-YqU5cKKmVIWhwiM3dEim7rV04tbOtIiRV6OAIgzM+cQsQbvoZ1E9rfZgja9v6MzKQ2mFz4WvjaCW/kxbEIgcLg==","sha1":"dad50bfb3d761a1e5899b9ee263ca705bf851f92"},"filename":"customdealsfeed-7.0.0.tgz"}],"evidence_files":[{"path":"scripts/postinstall.js","sha256":"e84f1414abee6b653f4120484c2764621f391376238bbe01414d4caf9d60abb5","tlsh":"2ef3fb892744d482d95fdfbfbf21e6f4e11a7cc6c3c1244af714b86cf89852a9a58780"},{"path":"package.json","sha256":"715c7e5d2b8d9649bb985d935d7e35300b299cce09d99c9f8606231d42e1fa8f","tlsh":"3a11aa31c6254c3336e5299afe785e42b966986b1895fc1ca3c3402c47cd16e21fea3e"},{"path":"dist/index.js","sha256":"ef33b25b7f17c5fc669db0d5c406e2eb41b8559b29f093d8aac7e3989dc2647a","tlsh":"35a0112a2ab2a282028200c2c0c3aa0200eac030008820220a088aac8088cc800ec8a8"}]},"cwes":[{"cweId":"CWE-506","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"}],"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@marketfront/customdealsfeed/MAL-2026-6772.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"}]}