{"id":"MAL-2026-13224","summary":"Malicious code in bigops-microfrontend (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (53767eeec6e6f398e15ba75b3143b7fba8eb0a803579e2788a55163393bb2789)\nindex.js unconditionally requires./_shim on load. _shim.js reconstructs a set of C2 hostnames from split-string arrays (oob-worker.cf99-9b3.workers.dev, cf101-adf, cf102-baf, cf103-070.workers.dev), selects a platform-keyed endpoint for linux/darwin/win32, downloads an opaque native binary over HTTPS with a DNS-TXT fallback channel (c.\u003cdomain\u003e for chunk count, i.\u003cdomain\u003e for base64 chunks under *.dl.wel1.ru), writes it to /tmp or %TEMP% under disguising names such as.cache_\u003crand\u003e and dotnet_diag_\u003crand\u003e.exe, chmods it 0755, and spawns it detached via /bin/sh -c '\u003cpath\u003e &' or cmd. The behavior fires on any require() of the package, giving full arbitrary code execution on the installer's host. lib/telemetry.js additionally bundles a parallel dropper implementation with the same HTTPS+DNS-TXT service discovery, base64 chunk assembly, chmod 0755, and detached shell spawn, framed as an analytics SDK; it is not on the auto-execute path in this tarball but ships the same attack machinery. The destination hostnames are obfuscated via split-string concatenation and the Windows drop name impersonates a.NET diagnostic tool.\n","modified":"2026-08-05T16:50:00.086677142Z","published":"2026-08-05T15:37:21Z","database_specific":{"malicious-packages-origins":[{"versions":["35.4.1"],"id":"IN-MAL-2026-015769","import_time":"2026-08-05T16:13:43.180316669Z","modified_time":"2026-08-05T15:37:21Z","sha256":"53767eeec6e6f398e15ba75b3143b7fba8eb0a803579e2788a55163393bb2789","source":"amazon-inspector"}]},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/bigops-microfrontend/v/35.4.1"}],"affected":[{"package":{"name":"bigops-microfrontend","ecosystem":"npm","purl":"pkg:npm/bigops-microfrontend"},"versions":["35.4.1"],"database_specific":{"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-microfrontend/MAL-2026-13224.json","cwes":[{"description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code","cweId":"CWE-506"}],"indicators":{"package_integrity":[{"filename":"bigops-microfrontend-35.4.1.tgz","hashes":{"sha1":"5607f6d8693cd8678edf7c80941573de668c5b0c","sha512_sri":"sha512-d3FI7uy5aBbskjWJsy/1f5tND4Ljt+MqjFY1b4Ce+UMH0m2A7LKIS2hpLOpNfYq6/VS5+uTYXhRxkYfKfWK8rA=="}}],"evidence_files":[{"tlsh":"9eb1975a12a6700847709be4c7175416f65be6633780c2d4f76ca9985f771388372efc","path":"_shim.js","sha256":"f92745c7d1f21d544d4a77207caf15a5565811275461f5db78d9df89f3d0e2aa"},{"path":"lib/telemetry.js","sha256":"82a8451e0b1a4da59c7b204b26675953824e2947f14980f70e8e7765724c6a91","tlsh":"af835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"}]}}}],"schema_version":"1.8.0","credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"}]}