{"id":"MAL-2026-13249","summary":"Malicious code in bigops-shared-ui (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (2864e806fc8b9b1002cc51dc96a78aa9084f3d8ce133fc636ac21372c3cdfb59)\nOn require of bigops-shared-ui, index.js loads./setup, which downloads a native executable from obfuscated Cloudflare Workers endpoints (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev) with a DNS TXT-record chunked fallback channel resolving base64 payload fragments under sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. Platform/architecture is selected to pick the correct binary, which is written to /tmp or %TEMP% under a deceptive name (dotnet_diag_\u003crand\u003e.exe or.cache_\u003crand\u003e), chmodded 0755, and spawned detached and unref'd (POSIX: /bin/sh -c 'file &'; Windows: cmd /c start /b with windowsHide). C2 hostnames are assembled at runtime from split-string fragments joined with.join(''), and require(\"child_process\") is likewise built via string concatenation (\"child_\"+\"process\"). A stderr no-op writer suppresses output, opt-out environment variables and a TTL-gated flag file (/tmp/.analytics_state or %TEMP%/analytics_state) throttle repeated fetches, and lib/telemetry.js contains the same child_process concatenation pattern. The detached, hidden, re-armed execution shape establishes ongoing attacker-controlled code execution on the installer host.\n","modified":"2026-08-05T16:50:12.386298036Z","published":"2026-08-05T15:33:08Z","database_specific":{"malicious-packages-origins":[{"modified_time":"2026-08-05T15:33:08Z","sha256":"2864e806fc8b9b1002cc51dc96a78aa9084f3d8ce133fc636ac21372c3cdfb59","source":"amazon-inspector","versions":["35.1.2"],"id":"IN-MAL-2026-015742","import_time":"2026-08-05T16:13:39.134948595Z"}]},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/bigops-shared-ui/v/35.1.2"}],"affected":[{"package":{"name":"bigops-shared-ui","ecosystem":"npm","purl":"pkg:npm/bigops-shared-ui"},"versions":["35.1.2"],"database_specific":{"cwes":[{"name":"Embedded Malicious Code","cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature."}],"indicators":{"package_integrity":[{"filename":"bigops-shared-ui-35.1.2.tgz","hashes":{"sha1":"277acad6d58bff5ad7105766176f8624facd20a5","sha512_sri":"sha512-qwQoqyBQP2oPnn+ndwh2+HgAzGh5+ZYfgkP/0/KiDBiaDqyCM/2bSTfXNYykNcrCnZn9B+COM9rwCSFKayULsw=="}}],"evidence_files":[{"sha256":"86961bf6b1e7cc812561741dd5292380b5e7cd6386f6e8f8bafea730952d5aa0","tlsh":"02a1965a06a6b01d4bb0a7f0c71b4816f65bf6633681c2c4fbac55945f726248372dfc","path":"setup.js"}]},"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-shared-ui/MAL-2026-13249.json"}}],"schema_version":"1.8.0","credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"}]}