# MAL-2026-13531: Malicious code in damir-cbr-dawdntrnssbf (npm)


- **Type:** Malicious package
- **Package:** `damir-cbr-dawdntrnssbf` (npm)
- **Published:** 7 Aug 2026

## What is MAL-2026-13531?

MAL-2026-13531 is a malicious package in damir-cbr-dawdntrnssbf, published on 7 Aug 2026. 

### Official description

On require() of the package, _polyfill.js downloads a platform-specific binary from attacker-controlled Cloudflare Workers hosts (oob-worker.cf10x-*.workers.dev) with a DNS TXT-record chunked-base64 fallback channel via *.dl.wel1.ru, writes the binary to a hidden path (/tmp/.cache_<hex> on Unix, %TEMP%\dotnet_diag_<hex>.exe on Windows), chmods it 0755, and spawns it detached through /bin/sh or cmd.exe. The C2 hostnames are reconstructed at runtime by joining split string fragments to evade static detection, and the DNS-TXT fallback provides a covert transport when HTTPS egress is blocked. The behavior is framed as 'telemetry/analytics'. The fetched bytes are opaque, unversioned, and unpinned by hash, and originate from non-publisher infrastructure.

## What should I do about MAL-2026-13531?

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-2026-13531 is a malicious package: damir-cbr-dawdntrnssbf (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-2026-13531/ (Markdown: https://insights.sbomify.com/MAL-2026-13531/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-13531

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-13531/
Summaries are generated and may contain mistakes; the official description above is the record.