bigops-logs-player

{"modified":"2026-08-05T15:38:12Z","published":"2026-08-05T15:38:12Z","schema_version":"1.7.4","id":"MAL-2026-13223","summary":"Malicious code in bigops-logs-player (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (f5a922558781f9614bc47976e2e695cc8a5996ef51865fb5b37928f842718b5d)\nOn require() of bigops-logs-player, index.js loads _polyfill.js, which reconstructs a list of Cloudflare Workers hostnames (oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) from split string fragments to hide them from static scanners. It downloads an OS-specific native binary via https.get, writes it to /tmp or %TEMP% under a disguised name (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmods it 0o755, and spawns it detached through /bin/sh or cmd.exe. A DNS-TXT covert-channel fallback resolves alternate hosts under *.dl.wel1.ru (also assembled from split fragments). A freshness marker and environment opt-outs gate execution to reduce noise. The package advertises itself as a log-transport library; fetching and executing a native binary from obfuscated attacker-controlled infrastructure has no relation to that purpose.\n","affected":[{"package":{"ecosystem":"npm","name":"bigops-logs-player"},"versions":["35.2.8"],"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":"_polyfill.js","sha256":"99f4b7d6888357234da5953efd1521ab427958ecf77681536a9ab7aebdff94f7","tlsh":"4aa1845a02a970194bb0dbe4ca175816f65bfa633780c284fb5ca5881f73624c372dfc"}],"package_integrity":[{"filename":"bigops-logs-player-35.2.8.tgz","hashes":{"sha1":"9b4645c93400ada7241e4252f824dd3adab149e8","sha512_sri":"sha512-Kf/7Zt4KdZATTgDsI51oqNZV6UW2nbujFgumWAL/kcA7/7SbkZoEEmxrRoqnTUPNEaFKqZuEbMRBvENS67p84g=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/bigops-logs-player/v/35.2.8"}],"credits":[{"name":"Amazon Inspector","type":"FINDER","contact":["inspector-research@amazon.com"]}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-015774","import_time":"2026-08-05T16:13:43.82258511Z","modified_time":"2026-08-05T15:38:12Z","sha256":"f5a922558781f9614bc47976e2e695cc8a5996ef51865fb5b37928f842718b5d","source":"amazon-inspector","versions":["35.2.8"]}]}}