@user-services/web-components

{"schema_version":"1.7.4","id":"MAL-2026-16379","published":"2026-09-22T13:57:51Z","modified":"2026-10-12T13:49:14.299780444Z","aliases":["GHSA-f3g4-6hpx-9mcq"],"summary":"Malicious code in @user-services/web-components (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (02523ee1cb3bbb9119054ec3ed14ffc62d0d33ae3bd44dc29312c772cdba106b)\n@user-services/web-components@9.9.10 fires a hidden telemetry probe on both the npm install lifecycle (`node index.js`) and on every `require()` of the module. The probe in probe/impl.js reads os.userInfo().username, os.hostname() and the basename of process.cwd(), concatenates them with a prefix `uswc` and a timestamp into a subdomain of `oob.algamil7x.xyz`, and issues a `dns.resolve4` query — the query name itself is the exfiltration channel, delivering installer identity to the attacker-controlled authoritative nameserver. The exfil pipeline is deliberately hidden from static analysis: supporting modules (b8d6e3.js, c9e7f4.js) reconstruct the strings `os`, `dns`, `process`, `userInfo`, `hostname`, `cwd`, `resolve4` and the destination host `oob.algamil7x.xyz` from `String.fromCharCode` byte arrays, and load the `os` and `dns` core modules via `module.constructor._load(...)` instead of a static `require`. The destination host is not the declared homepage and is not documented anywhere in the package. The scope `@user-services` and its placeholder repository/author metadata (`github.com/user-services/web-components`, `eng@user-services.dev`) are generic and consistent with a dependency-confusion lure aimed at organisations with an internal `@user-services/*` scope.\n\n## Source: ghsa-malware (a26643867a117b96b0d18cd07cbec2dbc5968abf2ea90f77d2999de7806a4721)\nAny 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.\n","affected":[{"package":{"name":"@user-services/web-components","ecosystem":"npm"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"}]}],"versions":["9.9.10"],"database_specific":{"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"}],"indicators":{"evidence_files":[{"path":"runtime/support/telemetry/probe/impl.js","sha256":"303e024d53affd063c83f1f13df4d0cfd14754e462e96d1ccd4ebc4b0e8ebb00","tlsh":"78119c5ab253d08f23c04695391c43e1882ec2d087cd10d1bbbc279ba28d7914ad3a66"},{"path":"runtime/support/telemetry/probe/c9e7f4.js","sha256":"8abb9d677003e4dbdfe9ed14dc47eca3b9023a66c935989b593ba61d1b58e5cf","tlsh":"e9e0201b219fe14fa6d85ea73f17c5dac8420900e21d8ad9fa1d4787106a406c0c0770"},{"path":"package.json","sha256":"554de13e4624f1bbdd4ef2a958dcbff646058685492ba1f458c2c8f4d4950cce","tlsh":"ef110821856394331ad03ba09d76284b73a74856cde2bc0c17f7592483ced9a10fe37a"}],"package_integrity":[{"filename":"web-components-9.9.10.tgz","hashes":{"sha1":"c3dc537969fc56745a73204da81b3063b562f534","sha512_sri":"sha512-UOG7X/AW829XHcu1iR2ujidCrJFuSn2H6W5NKsxDc7piQHSUtGdWMU6ErpMecnY3Mb1PLzrL76VlRfi8huDVLQ=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/@user-services/web-components/v/9.9.10"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-f3g4-6hpx-9mcq"}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-020286","import_time":"2026-09-22T14:19:07.710077681Z","modified_time":"2026-09-22T13:57:51Z","sha256":"02523ee1cb3bbb9119054ec3ed14ffc62d0d33ae3bd44dc29312c772cdba106b","source":"amazon-inspector","versions":["9.9.10"]},{"id":"GHSA-f3g4-6hpx-9mcq","import_time":"2026-10-12T13:47:27.084674847Z","modified_time":"2026-10-12T12:55:17Z","ranges":[{"events":[{"introduced":"0"}],"type":"SEMVER"}],"sha256":"a26643867a117b96b0d18cd07cbec2dbc5968abf2ea90f77d2999de7806a4721","source":"ghsa-malware"}]},"credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"}]}