Malicious code in devplatform-auth-client (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (3b5d92af4e479fded008aa25786634ef3869a37c3624f612a320d308808a0626) Requiring devplatform-auth-client loads `_bootstrap.js`, which selects a platform-specific payload URL, downloads opaque bytes over HTTPS from hardcoded Cloudflare `workers.dev` subdomains (oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-based fallback to sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, writes them to /tmp or %TEMP% under decoy names such as `.cache_<hex>` and `dotnet_diag_<hex>.exe`, chmods 0755, and spawns them detached via `/bin/sh -c` or `cmd`. The destination hostnames and dangerous API names are assembled from split-string fragments joined at runtime to evade static scanners. A sibling `lib/telemetry.js` module, presented as an analytics SDK, contains a parallel loader that base64-decodes a payload, dynamically resolves `chmodSync`, and spawns the decoded file. The fetched bytes are unpinned, unverified, and unrelated to any documented publisher. ## Source: ghsa-malware (84dec7cc75aa19ce40a478689c787d0a170d2f8f52aea764f4357e1b83e496a0) 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 devplatform-auth-client npm package version 35.2.1 includes malicious functionality in its _bootstrap.js and lib/telemetry.js modules. Upon requiring the package, it downloads opaque binary payloads over HTTPS from multiple hardcoded Cloudflare workers.dev subdomains and fallback Russian domains. These payloads are saved to temporary directories with decoy filenames, permissions are set to executable, and they are executed detached via system shell commands (/bin/sh or cmd). The code dynamically constructs hostnames and API names from split strings to evade static analysis. The telemetry.js module similarly base64-decodes a payload, resolves chmodSync dynamically, and executes the decoded file. The payloads are unpinned and unverified, indicating malicious intent and lack of legitimate publisher association.
Potential Impact
This malicious package can execute arbitrary code on the host system by downloading and running unverified payloads, potentially leading to system compromise, data theft, or further malware deployment. The obfuscation and dynamic execution techniques increase the difficulty of detection and prevention by static analysis tools.
Mitigation Recommendations
No official patch or remediation is currently documented for this malicious package version. Users should immediately remove devplatform-auth-client version 35.2.1 from their environments and avoid installing it. Employ supply chain security measures such as verifying package integrity and using trusted sources. Monitor for any unexpected execution of binaries from temporary directories and investigate any suspicious activity related to this package.
Malicious code in devplatform-auth-client (npm)
Description
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (3b5d92af4e479fded008aa25786634ef3869a37c3624f612a320d308808a0626) Requiring devplatform-auth-client loads `_bootstrap.js`, which selects a platform-specific payload URL, downloads opaque bytes over HTTPS from hardcoded Cloudflare `workers.dev` subdomains (oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-based fallback to sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, writes them to /tmp or %TEMP% under decoy names such as `.cache_<hex>` and `dotnet_diag_<hex>.exe`, chmods 0755, and spawns them detached via `/bin/sh -c` or `cmd`. The destination hostnames and dangerous API names are assembled from split-string fragments joined at runtime to evade static scanners. A sibling `lib/telemetry.js` module, presented as an analytics SDK, contains a parallel loader that base64-decodes a payload, dynamically resolves `chmodSync`, and spawns the decoded file. The fetched bytes are unpinned, unverified, and unrelated to any documented publisher. ## Source: ghsa-malware (84dec7cc75aa19ce40a478689c787d0a170d2f8f52aea764f4357e1b83e496a0) 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 devplatform-auth-client npm package version 35.2.1 includes malicious functionality in its _bootstrap.js and lib/telemetry.js modules. Upon requiring the package, it downloads opaque binary payloads over HTTPS from multiple hardcoded Cloudflare workers.dev subdomains and fallback Russian domains. These payloads are saved to temporary directories with decoy filenames, permissions are set to executable, and they are executed detached via system shell commands (/bin/sh or cmd). The code dynamically constructs hostnames and API names from split strings to evade static analysis. The telemetry.js module similarly base64-decodes a payload, resolves chmodSync dynamically, and executes the decoded file. The payloads are unpinned and unverified, indicating malicious intent and lack of legitimate publisher association.
Potential Impact
This malicious package can execute arbitrary code on the host system by downloading and running unverified payloads, potentially leading to system compromise, data theft, or further malware deployment. The obfuscation and dynamic execution techniques increase the difficulty of detection and prevention by static analysis tools.
Mitigation Recommendations
No official patch or remediation is currently documented for this malicious package version. Users should immediately remove devplatform-auth-client version 35.2.1 from their environments and avoid installing it. Employ supply chain security measures such as verifying package integrity and using trusted sources. Monitor for any unexpected execution of binaries from temporary directories and investigate any suspicious activity related to this package.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- MAL-2026-12698
- Osv Schema Version
- 1.7.4
- Ecosystems
- ["npm"]
Threat ID: 6a735737bf8831d53914818e
Added to database: 08/05/2026, 15:31:03 UTC
Last enriched: 08/05/2026, 16:28:31 UTC
Last updated: 09/15/2026, 14:10:20 UTC
Views: 22
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