# MAL-2026-4177: Malicious code in did-0091 (npm)


- **Type:** Malicious package
- **Package:** `did-0091` (npm)
- **Published:** 19 May 2026

## What is MAL-2026-4177?

MAL-2026-4177 is a malicious package in did-0091, published on 19 May 2026. 

### Official description

On `npm install`, the package's postinstall script runs `node -e` to fetch the installer's public IP from api.ipify.org, execute `id || ver && whoami && hostname`, and collect hostname, cwd, and USERDOMAIN/COMPANY environment variables. The bundle is POSTed to a hardcoded interactsh subdomain at lszakfghwnvxspyfcmaabd1css99rnq3w.oast.fun. The package has no legitimate function: description is 'xxx', main file index.js is 0 bytes, and the only behavior is the install-time beacon. Combined with the unusual name shape, this matches dependency-confusion reconnaissance campaigns that probe corporate networks via Project Discovery's interactsh out-of-band service.

The OpenSSF Package Analysis project identified 'did-0091' @ 11.0.6 (npm) as malicious.

It is considered malicious because:

- The package communicates with a domain associated with malicious activity.

- The package executes one or more commands associated with malicious behavior.

## What should I do about MAL-2026-4177?

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-2026-4177 is a malicious package: did-0091 (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-2026-4177/ (Markdown: https://insights.sbomify.com/MAL-2026-4177/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-4177

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-4177/
Summaries are generated and may contain mistakes; the official description above is the record.