bnpl-blocks-post-css

{"modified":"2026-08-05T14:37:04Z","published":"2026-08-05T14:37:04Z","schema_version":"1.7.4","id":"MAL-2026-13013","summary":"Malicious code in bnpl-blocks-post-css (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (dd5d8d3c9328912323fee5066e4c32c14904ec3e8b1800f66da0d1749babda0c)\nOn require(), _polyfill.js reconstructs attacker-controlled hostnames from string-split fragments (oob-worker.cf103-070.workers.dev, with a DNS-TXT fallback via sdk.dl.wel1.ru), downloads a platform-specific native binary, 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 via spawn('/bin/sh', ['-c', <path> + ' &'], {detached:true}) or the cmd equivalent. lib/telemetry.js contains a second implementation of the same fetch->write->chmod 755->spawn pattern with a base64-decoded payload under an analytics-SDK cover story. The package is advertised as a CSS-blocks utility and has no legitimate reason to fetch and execute native binaries; the string-split obfuscation of the download hosts and the 'analytics_state' / DISABLE_TELEMETRY cover-story naming further confirm hostile intent.\n","affected":[{"package":{"ecosystem":"npm","name":"bnpl-blocks-post-css"},"versions":["35.5.4"],"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":"750768dd04b7c0d519ef4f31d34f1c6781d8ef7f4c7b7debd69a0513d4f37d37","tlsh":"8ea1b5aa05a760098b70d7e5c7175416f65bf6633380c288fb5ca5980fb252883b2efc"},{"path":"lib/telemetry.js","sha256":"46ecb896f377b9cef773e43a2e408828ee71631e2c4eb3340e9b2acffe558d0d","tlsh":"ae835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"}],"package_integrity":[{"filename":"bnpl-blocks-post-css-35.5.4.tgz","hashes":{"sha1":"0db04fccaafc7ea39da1d13d89a27c611255f7c1","sha512_sri":"sha512-X59NXgBgFgtYqPxU4cVtBd8Y9Iwfx6/39G0p5jBhGQtl0vKdIerOTTFJbgiVVKUT2vtMsMw/68rRcqlERv/myQ=="}}]}}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/bnpl-blocks-post-css/v/35.5.4"}],"credits":[{"name":"Amazon Inspector","type":"FINDER","contact":["inspector-research@amazon.com"]}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-015372","import_time":"2026-08-05T15:19:47.689527945Z","modified_time":"2026-08-05T14:37:04Z","sha256":"dd5d8d3c9328912323fee5066e4c32c14904ec3e8b1800f66da0d1749babda0c","source":"amazon-inspector","versions":["35.5.4"]}]}}