MAL-2026-13523
Vulnerability from ossf_malicious_packages
-= Per source details. Do not edit below this line.=-
Source: amazon-inspector (44380c53af51645632593b0a86d93258bb71aecddc88d9ff3487a7906486e559)
On require() of the package, index.js loads _vendor.js which runs a bootstrap routine that rotates through obfuscated Cloudflare Workers hosts (oob-worker.cf.workers.dev, string-split-reassembled at runtime), downloads a platform-specific binary, writes it as a hidden file under /var/tmp or the Windows Temp directory with a decoy name (.cache_ / dotnet_diag_.exe), chmods 0755, and spawns it detached via /bin/sh or cmd. A DNS TXT fallback under .dl.wel1.ru reassembles a base64-encoded payload when HTTPS fetches fail. A cover-story opt-out gate honors DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK and caches state at /tmp/.analytics_state with a ~5h TTL to suppress re-execution, masquerading as telemetry. The package is advertised as a React UI popover component and has no legitimate reason to fetch and execute native binaries from anonymized workers.dev endpoints at import time. This grants full-host code execution on any machine that installs or requires the package.
- 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": "_vendor.js",
"sha256": "4c543d8d78b49a389306549fef20a46ad7c2f210a285beb25d9f0633cccd9dd8",
"tlsh": "cea1866a12aa70194bb0d7e48717441af65af6633380c6d8fb6c65941f77124c3b2efc"
}
],
"package_integrity": [
{
"filename": "beaver-ui-popover-marker-35.5.8.tgz",
"hashes": {
"sha1": "c77d6419c31c56b3fe6b6c53f58160cb8161108b",
"sha512_sri": "sha512-fczD7A3bhGGtSoZ5ivgWMeOT+4WnzPXPHKLFkoATFnSJ7FXfyNUwrRMT40ula2gKd0VjlYTe0FE8XucSL6vMuA=="
}
}
]
}
},
"package": {
"ecosystem": "npm",
"name": "beaver-ui-popover-marker"
},
"versions": [
"35.5.8"
]
}
],
"credits": [
{
"contact": [
"inspector-research@amazon.com"
],
"name": "Amazon Inspector",
"type": "FINDER"
}
],
"database_specific": {
"malicious-packages-origins": [
{
"id": "IN-MAL-2026-017014",
"import_time": "2026-08-07T12:51:22.205884043Z",
"modified_time": "2026-08-07T12:31:20Z",
"sha256": "44380c53af51645632593b0a86d93258bb71aecddc88d9ff3487a7906486e559",
"source": "amazon-inspector",
"versions": [
"35.5.8"
]
}
]
},
"details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (44380c53af51645632593b0a86d93258bb71aecddc88d9ff3487a7906486e559)\nOn require() of the package, index.js loads _vendor.js which runs a bootstrap routine that rotates through obfuscated Cloudflare Workers hosts (oob-worker.cf*.workers.dev, string-split-reassembled at runtime), downloads a platform-specific binary, writes it as a hidden file under /var/tmp or the Windows Temp directory with a decoy name (.cache_\u003chex\u003e / dotnet_diag_\u003chex\u003e.exe), chmods 0755, and spawns it detached via /bin/sh or cmd. A DNS TXT fallback under *.dl.wel1.ru reassembles a base64-encoded payload when HTTPS fetches fail. A cover-story opt-out gate honors DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK and caches state at /tmp/.analytics_state with a ~5h TTL to suppress re-execution, masquerading as telemetry. The package is advertised as a React UI popover component and has no legitimate reason to fetch and execute native binaries from anonymized workers.dev endpoints at import time. This grants full-host code execution on any machine that installs or requires the package.\n",
"id": "MAL-2026-13523",
"modified": "2026-08-07T12:31:20Z",
"published": "2026-08-07T12:31:20Z",
"references": [
{
"type": "PACKAGE",
"url": "https://www.npmjs.com/package/beaver-ui-popover-marker/v/35.5.8"
}
],
"schema_version": "1.7.4",
"summary": "Malicious code in beaver-ui-popover-marker (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.