{"schema_version":"1.8.0","id":"MAL-2026-12171","published":"2026-08-05T08:46:55Z","modified":"2026-08-05T10:06:03.752092991Z","summary":"Malicious code in bigops-informer (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (324bb851ecf14c623080e07471bd23a7ea505bc6db244c654895a1cce71bf7e8)\nOn require(), index.js loads _bootstrap.js which reconstructs a set of destination hostnames from string-array joins (resolving to oob-worker.cf99-9b3.workers.dev, cf101-adf/cf102-baf/cf103-070.workers.dev, and sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru), downloads a platform-specific executable via https.get, writes it to a temp path under disguised names (dotnet_diag_*.exe /.cache_*), chmods it 0755, and spawns it detached via cp.spawn('/bin/sh', ['-c', fp+' &']) or spawn('cmd',...) on Windows. If the HTTPS mirrors fail, _bootstrap.js falls back to a DNS TXT covert channel: it resolves c.<domain> to get a chunk count, then resolves N.<domain> for each chunk, concatenates the base64 chunks, decodes them to a binary buffer, and writes+executes the result. The module also includes a TTL stamp and env-based opt-out checks consistent with hostile staging.\n","affected":[{"package":{"name":"bigops-informer","ecosystem":"npm","purl":"pkg:npm/bigops-informer"},"versions":["35.4.8"],"database_specific":{"cwes":[{"cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature.","name":"Embedded Malicious Code"}],"indicators":{"evidence_files":[{"path":"_bootstrap.js","sha256":"672aed4de18ddc69be7979e8a42b2e3b76ed45526ac3bff30759f50d1f1eba2e","tlsh":"35a1b95a16b670088bb09be48b175405f65ae6633780c6d4f79ca5d41fb703483b2efc"}],"package_integrity":[{"filename":"bigops-informer-35.4.8.tgz","hashes":{"sha1":"fe7dd1286f9211877fdba637d8f49529e9aa51d4","sha512_sri":"sha512-GFnHLGwbcW0vy/Qzuvyll74az60T/hMu9MF8NV2SDJtG+nEgWvhuElNUnysGCeVWCw9/Qu5KzMYi/8kAi5eNAw=="}}]},"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-informer/MAL-2026-12171.json"}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/bigops-informer/v/35.4.8"}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-014414","import_time":"2026-08-05T09:28:08.564943614Z","modified_time":"2026-08-05T08:46:55Z","sha256":"324bb851ecf14c623080e07471bd23a7ea505bc6db244c654895a1cce71bf7e8","source":"amazon-inspector","versions":["35.4.8"]}]},"credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"}]}