MAL-2026-13526
Vulnerability from ossf_malicious_packages
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (1d8f6d857df9a0aa674b5354167a3eb1c28634b9e61a9436f19a9ffcb8a8b734)
bigops-shared-product-design@35.9.3 ships adapter.js, which is unconditionally loaded via index.js on require(). On load it fetches a platform-specific native binary from hardcoded Cloudflare Workers hosts (oob-worker.cf101-a.workers.dev, cf99-9b3.workers.dev, cf100-416.workers.dev), with a DNS-TXT fallback that queries resolver domains under dl.wel1.ru (sdk./ext./pkg./net.). The fetched bytes are written to /tmp/.cache on Unix or %TEMP%/dotnet_diag_.exe on Windows, chmod'd to 0755, and spawned detached via /bin/sh -c or cmd /c start. Destinations and resolver domains are assembled at runtime by joining fragmented string literals (["oob-worker.cf101-a","df.workers.","dev"].join(""), ['sdk.dl.wel1.r','u'].join(""), require("child_"+"process")) to evade static analysis. No hash pinning, no signature check, destinations unrelated to any documented publisher. A sibling module lib/telemetry.js contains the same download-chmod-spawn pattern with base64-decoded chunks, indicating a shared dropper toolkit. Masquerade filenames (dotnet_diag,.cache_), /tmp staging, detached spawn, and DNS-TXT chunked fallback are canonical dropper tradecraft.
- CWE-506 - The product contains code that appears to be malicious in nature.
{
"affected": [
{
"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": "_adapter.js",
"sha256": "9abe1d794a370734bc41f7cc4a0654f5aa71aedb992a004d526985cb6ab979b1",
"tlsh": "4ba1875a067970198bb0dbe48717441af65be6933380c2d4fbac65945f7722483b2efc"
},
{
"path": "lib/telemetry.js",
"sha256": "1964470ba6edc84ce37e840e74670ca89a8ca035ba2ccf03cca4e19fff779dc8",
"tlsh": "15835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
}
],
"package_integrity": [
{
"filename": "bigops-shared-product-design-35.9.3.tgz",
"hashes": {
"sha1": "1ee9de76a09d794caea804a9e920b5be7783e0d7",
"sha512_sri": "sha512-ZjOit47Z4y4H9kALuHsNhARfEKpHqBz1zSxerg3cw9wqzaSKeRRpgl55fhqavId8vp7MijwMEAgW76J2RP8iTA=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "bigops-shared-product-design"
},
"versions": [
"35.9.3"
]
}
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"id": "IN-MAL-2026-017034",
"import_time": "2026-08-07T12:51:23.015114565Z",
"modified_time": "2026-08-07T12:34:19Z",
"sha256": "1d8f6d857df9a0aa674b5354167a3eb1c28634b9e61a9436f19a9ffcb8a8b734",
"source": "amazon-inspector",
"versions": [
"35.9.3"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (1d8f6d857df9a0aa674b5354167a3eb1c28634b9e61a9436f19a9ffcb8a8b734)\nbigops-shared-product-design@35.9.3 ships _adapter.js, which is unconditionally loaded via index.js on require(). On load it fetches a platform-specific native binary from hardcoded Cloudflare Workers hosts (oob-worker.cf101-a.workers.dev, cf99-9b3.workers.dev, cf100-416.workers.dev), with a DNS-TXT fallback that queries resolver domains under dl.wel1.ru (sdk./ext./pkg./net.). The fetched bytes are written to /tmp/.cache_\u003crand\u003e on Unix or %TEMP%/dotnet_diag_\u003crand\u003e.exe on Windows, chmod\u0027d to 0755, and spawned detached via /bin/sh -c or cmd /c start. Destinations and resolver domains are assembled at runtime by joining fragmented string literals ([\"oob-worker.cf101-a\",\"df.workers.\",\"dev\"].join(\"\"), [\u0027sdk.dl.wel1.r\u0027,\u0027u\u0027].join(\"\"), require(\"child_\"+\"process\")) to evade static analysis. No hash pinning, no signature check, destinations unrelated to any documented publisher. A sibling module lib/telemetry.js contains the same download-chmod-spawn pattern with base64-decoded chunks, indicating a shared dropper toolkit. Masquerade filenames (dotnet_diag,.cache_\u003crand\u003e), /tmp staging, detached spawn, and DNS-TXT chunked fallback are canonical dropper tradecraft.\n",
"id": "MAL-2026-13526",
"modified": "2026-08-07T12:34:19Z",
"published": "2026-08-07T12:34:19Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/bigops-shared-product-design/v/35.9.3"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in bigops-shared-product-design (npm)"
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.