{"schema_version":"1.8.0","id":"MAL-2026-12753","published":"2026-08-05T13:43:53Z","modified":"2026-08-05T14:36:55.636081772Z","summary":"Malicious code in devplatform-snarkdown (npm)","details":"\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (050140bdd00f1d32d6a6142067c28c92fe95ff1be979f4272c8966ba58c78b92)\nOn require of the package, _shim.js selects a platform-specific URL, downloads a binary from hardcoded Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev), and falls back to a DNS-TXT covert channel that reconstructs a base64 payload from chunked TXT records under wel1.ru subdomains (sdk/ext/pkg/net.dl.wel1.ru). The fetched bytes are written to a temp path under a masquerading name (e.g..cache_* / dotnet_diag_*.exe), chmodded 0755 on POSIX, and spawned detached via /bin/sh -c or cmd.exe /c start /b. Hostnames and resolver domains are assembled at runtime by joining string fragments to defeat static analysis. A timestamped lockfile at /tmp/.analytics_state (or %TEMP%\\analytics_state) gates re-execution for ~21201 seconds, and DISABLE_TELEMETRY / ANALYTICS_OPT_OUT / DO_NOT_TRACK env vars cause early return — a sandbox/CI evasion posture wrapped in telemetry cover-story naming. The package advertises itself as a markdown parser; downloading and executing a native binary at require time is unrelated to that purpose.\n","affected":[{"package":{"name":"devplatform-snarkdown","ecosystem":"npm","purl":"pkg:npm/devplatform-snarkdown"},"versions":["35.2.1"],"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":"_shim.js","sha256":"9ed29faade9c222addc6bc341112306e1e57e2880581099303567beb6d17c35d","tlsh":"a8a1745a06a670084bb09be0cb175416f55bf6637380d294fb9ca5985fb352483b2efc"}],"package_integrity":[{"filename":"devplatform-snarkdown-35.2.1.tgz","hashes":{"sha1":"a8418ccd50c8efc9aa6ce8d01acf10e8c004c2e6","sha512_sri":"sha512-UDq3Ii1nOZ2Uqi2hy1+HnVmmgzz6HowcT9ep81gKvoRHteVrstMmzJAknwlRG3fHzYc5O6tWRXem5PkAbxtAgw=="}}]},"source":"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/devplatform-snarkdown/MAL-2026-12753.json"}}],"references":[{"type":"PACKAGE","url":"https://www.npmjs.com/package/devplatform-snarkdown/v/35.2.1"}],"database_specific":{"malicious-packages-origins":[{"id":"IN-MAL-2026-015017","import_time":"2026-08-05T14:19:53.033631506Z","modified_time":"2026-08-05T13:43:53Z","sha256":"050140bdd00f1d32d6a6142067c28c92fe95ff1be979f4272c8966ba58c78b92","source":"amazon-inspector","versions":["35.2.1"]}]},"credits":[{"name":"Amazon Inspector","contact":["inspector-research@amazon.com"],"type":"FINDER"}]}