MAL-2026-13559
Vulnerability from ossf_malicious_packages
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (ef9992e81f3de4cb9bd4391466d7850e953c19a0772ebbe5992953044466377c)
On require(), shim.js fetches an OS/architecture-specific native binary from hardcoded Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) whose hostnames are reconstructed at runtime via array-join to evade static inspection. The payload is written to /tmp or %TEMP% under a disguised name (.cache on Unix, dotnet_diag_.exe on Windows), chmodded 0755, and spawned detached via /bin/sh -c or cmd. If HTTPS fetches fail, the loader falls back to a DNS-TXT covert channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, retrieving a chunk count from c. and reassembling a base64-encoded binary from sequentially-numbered subdomain TXT records. index.js requires _shim on load, so importing the package auto-executes the fetched attacker-controlled native binary with no version pinning, no hash or signature verification, and destinations unrelated to the package's stated purpose. A 21028-second cache stamp gates repeats and undocumented environment variables provide an operator opt-out, both consistent with hostile dropper tradecraft rather than legitimate functionality.
- 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": "_shim.js",
"sha256": "0e8158e4aa76a286f520de3e54708eda541df671d703feee52a7893cf6d8a0b3",
"tlsh": "44a1845a26fb30180793e5d4851f8826719af65333c4d9c4fb8c6a984fe653883b29fc"
}
],
"package_integrity": [
{
"filename": "dolyame-ui-collapseblock-35.8.1.tgz",
"hashes": {
"sha1": "0a8abfa47bbdc9e9bf6442549b3fbf16cba5a1e7",
"sha512_sri": "sha512-AxhNpQ0OyuFNuGjdOTNUp11ihZGLsslQh0wUGEVafE+WL+BAfBkmwhVVnMcT6QpPBRUVl2s9zdOXrgL642fzGw=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "dolyame-ui-collapseblock"
},
"versions": [
"35.8.1"
]
}
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"id": "IN-MAL-2026-017031",
"import_time": "2026-08-07T12:51:22.926554919Z",
"modified_time": "2026-08-07T12:33:49Z",
"sha256": "ef9992e81f3de4cb9bd4391466d7850e953c19a0772ebbe5992953044466377c",
"source": "amazon-inspector",
"versions": [
"35.8.1"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (ef9992e81f3de4cb9bd4391466d7850e953c19a0772ebbe5992953044466377c)\nOn require(), _shim.js fetches an OS/architecture-specific native binary from hardcoded Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) whose hostnames are reconstructed at runtime via array-join to evade static inspection. The payload is written to /tmp or %TEMP% under a disguised name (.cache_\u003crand\u003e on Unix, dotnet_diag_\u003crand\u003e.exe on Windows), chmodded 0755, and spawned detached via /bin/sh -c or cmd. If HTTPS fetches fail, the loader falls back to a DNS-TXT covert channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, retrieving a chunk count from c.\u003cdomain\u003e and reassembling a base64-encoded binary from sequentially-numbered subdomain TXT records. index.js requires _shim on load, so importing the package auto-executes the fetched attacker-controlled native binary with no version pinning, no hash or signature verification, and destinations unrelated to the package\u0027s stated purpose. A 21028-second cache stamp gates repeats and undocumented environment variables provide an operator opt-out, both consistent with hostile dropper tradecraft rather than legitimate functionality.\n",
"id": "MAL-2026-13559",
"modified": "2026-08-07T12:33:49Z",
"published": "2026-08-07T12:33:49Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/dolyame-ui-collapseblock/v/35.8.1"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in dolyame-ui-collapseblock (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.