{"id":"MAL-2026-13531","summary":"Malicious code in damir-cbr-dawdntrnssbf (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (b201b86e8198a519343eebfaa548af8848dcad42b507826b052f5c97fbcfa90f)\nOn require() of the package, _polyfill.js downloads a platform-specific binary from attacker-controlled Cloudflare Workers hosts (oob-worker.cf10x-*.workers.dev) with a DNS TXT-record chunked-base64 fallback channel via *.dl.wel1.ru, writes the binary to a hidden path (/tmp/.cache_\u003chex\u003e on Unix, %TEMP%\\dotnet_diag_\u003chex\u003e.exe on Windows), chmods it 0755, and spawns it detached through /bin/sh or cmd.exe. The C2 hostnames are reconstructed at runtime by joining split string fragments to evade static detection, and the DNS-TXT fallback provides a covert transport when HTTPS egress is blocked. The behavior is framed as 'telemetry/analytics'. The fetched bytes are opaque, unversioned, and unpinned by hash, and originate from non-publisher infrastructure.\n","modified":"2026-08-07T13:20:17.519499770Z","published":"2026-08-07T12:29:07Z","database_specific":{"malicious-packages-origins":[{"source":"amazon-inspector","versions":["35.8.1"],"id":"IN-MAL-2026-017000","import_time":"2026-08-07T12:51:21.64427696Z","modified_time":"2026-08-07T12:29:07Z","sha256":"b201b86e8198a519343eebfaa548af8848dcad42b507826b052f5c97fbcfa90f"}]},"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/damir-cbr-dawdntrnssbf/v/35.8.1"}],"affected":[{"package":{"name":"damir-cbr-dawdntrnssbf","ecosystem":"npm","purl":"pkg:npm/damir-cbr-dawdntrnssbf"},"versions":["35.8.1"],"database_specific":{"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/damir-cbr-dawdntrnssbf/MAL-2026-13531.json","indicators":{"evidence_files":[{"path":"_polyfill.js","sha256":"efca0950f6685a9c4b48c9a01a083bc19346218d18176c82ac243cf086a6204b","tlsh":"4ca1a75919fa70140392f1d8851b681a719bf65332c4e9c8fb8c66984fd7269c3f39ec"}],"package_integrity":[{"hashes":{"sha512_sri":"sha512-BUtHoT/7ZMHfqYxVRHIGbnb6G1GeSlSNVKyt6sLNHTT+BoVsXX+0jmptzFmydyHe7UlKeUMw/lzjSxjHQ+Fg/A==","sha1":"d953473cc8379f05cfbc29896005687572dd0f2e"},"filename":"damir-cbr-dawdntrnssbf-35.8.1.tgz"}]},"cwes":[{"name":"Embedded Malicious Code","cweId":"CWE-506","description":"The product contains code that appears to be malicious in nature."}]}}],"schema_version":"1.8.0","credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"}]}