Malicious code in beaver-ui-subheader (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (b62336df8b8ee0e1bd3939f4515a4b25dd6741773f30344cd3a0d065d16358fb) The package advertises itself as a UI subheader component, but index.js requires./_support on load and _support.js downloads a platform-specific binary from string-concatenated Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, cf102-baf, cf100-416, cf103-070) with a DNS TXT-record fallback that reassembles base64 chunks from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /var/tmp/.cache_XXXX on Unix or %TEMP%/dotnet_diag_XXXX.exe on Windows, chmodded to 0755, and spawned detached via /bin/sh -c or cmd. Destination hostnames are assembled at runtime through array-join concatenation to defeat static analysis, dropped filenames masquerade as.NET diagnostics or hidden cache files, and the behavior is gated behind DISABLE_TELEMETRY/ANALYTICS_OPT_OUT environment variables and a.analytics_state TTL stamp file to present a telemetry cover story. A UI component library has no legitimate reason to fetch and execute an opaque native binary from anonymous Cloudflare Workers hosts at require time. ## Source: ghsa-malware (77c555ecdc70942121beda0c89e556c311f04bc6bc986fdc364ddbb6b07e7f09) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
AI Analysis
Technical Summary
The beaver-ui-subheader npm package (version 35.7.2) masquerades as a UI subheader component but includes malicious functionality. Upon loading, it requires a support script that downloads a platform-specific binary from dynamically assembled Cloudflare Workers hosts, using DNS TXT-record fallback to reassemble base64-encoded chunks from multiple domains. The binary is saved to temporary locations on Unix or Windows systems, given executable permissions, and executed detached from the main process. The package uses environment variables and a telemetry state file to gate this behavior and conceal its true intent. Such actions are not legitimate for a UI component library and indicate malicious intent.
Potential Impact
This malicious package can execute arbitrary native code on the host system without user consent, potentially leading to system compromise, data theft, or further malware deployment. The obfuscation techniques and use of detached execution make detection and analysis more difficult. There are no known exploits in the wild reported yet.
Mitigation Recommendations
No official patch or remediation is currently available. Users should immediately remove version 35.7.2 of beaver-ui-subheader from their projects and avoid using this package. Monitor for updates from the package maintainer or npm advisories for any official fixes or removals. Consider scanning existing environments for presence of this package and any suspicious binaries in temporary directories.
Malicious code in beaver-ui-subheader (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (b62336df8b8ee0e1bd3939f4515a4b25dd6741773f30344cd3a0d065d16358fb) The package advertises itself as a UI subheader component, but index.js requires./_support on load and _support.js downloads a platform-specific binary from string-concatenated Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, cf102-baf, cf100-416, cf103-070) with a DNS TXT-record fallback that reassembles base64 chunks from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /var/tmp/.cache_XXXX on Unix or %TEMP%/dotnet_diag_XXXX.exe on Windows, chmodded to 0755, and spawned detached via /bin/sh -c or cmd. Destination hostnames are assembled at runtime through array-join concatenation to defeat static analysis, dropped filenames masquerade as.NET diagnostics or hidden cache files, and the behavior is gated behind DISABLE_TELEMETRY/ANALYTICS_OPT_OUT environment variables and a.analytics_state TTL stamp file to present a telemetry cover story. A UI component library has no legitimate reason to fetch and execute an opaque native binary from anonymous Cloudflare Workers hosts at require time. ## Source: ghsa-malware (77c555ecdc70942121beda0c89e556c311f04bc6bc986fdc364ddbb6b07e7f09) Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The beaver-ui-subheader npm package (version 35.7.2) masquerades as a UI subheader component but includes malicious functionality. Upon loading, it requires a support script that downloads a platform-specific binary from dynamically assembled Cloudflare Workers hosts, using DNS TXT-record fallback to reassemble base64-encoded chunks from multiple domains. The binary is saved to temporary locations on Unix or Windows systems, given executable permissions, and executed detached from the main process. The package uses environment variables and a telemetry state file to gate this behavior and conceal its true intent. Such actions are not legitimate for a UI component library and indicate malicious intent.
Potential Impact
This malicious package can execute arbitrary native code on the host system without user consent, potentially leading to system compromise, data theft, or further malware deployment. The obfuscation techniques and use of detached execution make detection and analysis more difficult. There are no known exploits in the wild reported yet.
Mitigation Recommendations
No official patch or remediation is currently available. Users should immediately remove version 35.7.2 of beaver-ui-subheader from their projects and avoid using this package. Monitor for updates from the package maintainer or npm advisories for any official fixes or removals. Consider scanning existing environments for presence of this package and any suspicious binaries in temporary directories.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-12827
- Osv Schema Version
- 1.7.4
- Aliases
- []
- Ecosystems
- ["npm"]
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a738536bf8831d5394f0bf4
Added to database: 08/05/2026, 18:47:18 UTC
Last enriched: 08/05/2026, 18:58:34 UTC
Last updated: 08/16/2026, 13:11:14 UTC
Views: 36
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