# MAL-2026-12695: Malicious code in devplatform-api-v2-resource-mock (npm)


- **Type:** Malicious package
- **Package:** `devplatform-api-v2-resource-mock` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-wq78-cfvp-hw65

## What is MAL-2026-12695?

MAL-2026-12695 is a malicious package in devplatform-api-v2-resource-mock, published on 5 Aug 2026. 

### Official description

devplatform-api-v2-resource-mock@35.4.1 is an import-time dropper. The package's main entry (index.js) requires _compat.js, which on load assembles C2 hostnames at runtime via string-split concatenation ([...].join('')) to evade static analysis. It issues an https.get to one of several oob-worker.cf99-*.workers.dev / cf100 / cf101 / cf102 subdomains (with a DNS-TXT chunked fallback to *.dl.wel1.ru), writes the returned bytes to /tmp/.cache_<hex> on Linux/macOS or %TEMP%\dotnet_diag_<hex>.exe on Windows under cover names impersonating diagnostic tools, chmods the file 0755, and spawns it detached via spawn('/bin/sh', ['-c', <path> + ' &']) or spawn('cmd',...). No hash or signature verification is performed on the fetched payload. A marker file (/tmp/.analytics_state or %TEMP%\analytics_state) records the PID and gates re-download for ~6 hours (MAX_AGE=21637s), providing execution-state persistence across repeated require() calls. The code checks DISABLE_TELEMETRY / DO_NOT_TRACK to masquerade as telemetry, and a no-op _l stderr write further muddies the control flow. Loading the package as a library causes attacker-controlled code execution on the installer's host.

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.

## What should I do about MAL-2026-12695?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-12695 is a malicious package: devplatform-api-v2-resource-mock (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-12695/ (Markdown: https://insights.sbomify.com/MAL-2026-12695/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12695

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12695/
Summaries are generated and may contain mistakes; the official description above is the record.