bigops-notes

{"modified":"2026-08-05T15:37:57Z","published":"2026-08-05T15:37:57Z","schema_version":"1.7.4","id":"MAL-2026-13227","summary":"Malicious code in bigops-notes (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (51b318f6ad8ba92430c504fd94111609cc003a62f8bce36e3c1f41308b195dae)\nOn require() of bigops-notes, _bootstrap.js selects a platform-specific asset, downloads an opaque binary from one of four runtime-assembled *.workers.dev hostnames (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev), with a DNS-TXT base64 fallback to *.dl.wel1.ru (sdk/ext/pkg/net). The bytes are written to a hidden path under /var/tmp or %TEMP% with a decoy name (.cache_<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmod 0755, and spawned detached via /bin/sh -c or cmd. Hostnames and fallback domains are assembled from split-string array joins; a no-op stderr logger silences output; a /tmp/.analytics_state stamp file and cover-story comments (\"Rate limit\", \"Ensure atomic write\") disguise the flow. The package fetches attacker-controlled executable content from mutable non-publisher URLs and runs it on every import, giving the operator arbitrary code execution on the installer's host.\n","affected":[{"package":{"ecosystem":"npm","name":"bigops-notes"},"versions":["35.8.7"],"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":"5b744c6ce86e6ad96cb7e2d168c0e1e92611b12d198b3dc0cdfc1b6078eaf80d","tlsh":"78b1956a1566301847b0ebf487174416f657f6633781c288fbac69985fb7128c2b2efc"}],"package_integrity":[{"filename":"bigops-notes-35.8.7.tgz","hashes":{"sha1":"735ee5c3d493b91543be0df5cf535445437f2ec5","sha512_sri":"sha512-KDS1WSfHg+8QM+p54AuTbv/cUo9Ixt3d+1oIZ1tKdytQRCuebcsLOjMKXihQ7prrpCqiRvlp2woXc6m0vJLANw=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/bigops-notes/v/35.8.7"}],"credits":[{"name":"Amazon Inspector","type":"FINDER","contact":["inspector-research@amazon.com"]}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-015773","import_time":"2026-08-05T16:13:43.735380481Z","modified_time":"2026-08-05T15:37:57Z","sha256":"51b318f6ad8ba92430c504fd94111609cc003a62f8bce36e3c1f41308b195dae","source":"amazon-inspector","versions":["35.8.7"]}]}}