# MAL-2026-12440: Malicious code in sme-rko-finance-front-shared-entity-groups-models (npm)


- **Type:** Malicious package
- **Package:** `sme-rko-finance-front-shared-entity-groups-models` (npm)
- **Published:** 5 Aug 2026
- **Also known as:** GHSA-vfcf-g2jc-xm3x

## What is MAL-2026-12440?

MAL-2026-12440 is a malicious package in sme-rko-finance-front-shared-entity-groups-models, published on 5 Aug 2026. 

### Official description

index.js unconditionally requires./_polyfill.js on load. _polyfill.js constructs C2 hostnames at runtime via Array.join to evade static inspection (assembling `oob-worker.cf10[0-3]-*.workers.dev` mirrors plus a DNS-TXT fallback under `*.dl.well1.site`), fetches a platform-specific binary via https.get, writes it to /tmp or %TEMP% under cover-story filenames (`dotnet_diag_*.exe`, `.cache_*`, `.analytics_state`), sets mode 0755, and spawns it detached via `cp.spawn('/bin/sh', ['-c', fp + ' &'], {detached:true})` (or the cmd equivalent on Windows). Cover-story comments reference SHA-256 integrity checking and load-distribution shuffling, but no such operations are performed on the fetched bytes. lib/telemetry.js ships duplicate dropper primitives (`Buffer.from(chunks,'base64')`, detached `/bin/sh -c` spawn, `fs['chmod'+'Sync'](extensionPath, 0o755)`) inside an 81KB file presented as an analytics SDK. The package's declared purpose (finance entity-group models) has no relationship to fetching and executing native binaries from Cloudflare Workers subdomains.

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-2026-12440?

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-2026-12440 is a malicious package: sme-rko-finance-front-shared-entity-groups-models (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-2026-12440/ (Markdown: https://insights.sbomify.com/MAL-2026-12440/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-12440

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-12440/
Summaries are generated and may contain mistakes; the official description above is the record.