MAL-2026-13155 Malicious code in dolyame-ui-flag (npm)
Malicious package
Published
MAL-2026-13155 is a malicious package: dolyame-ui-flag (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-2026-13155/ (Markdown: https://insights.sbomify.com/MAL-2026-13155/index.md)
- Package
- dolyame-ui-flag
- Registry
- npm
What is MAL-2026-13155?
MAL-2026-13155 is a malicious package in dolyame-ui-flag, published on 5 Aug 2026.
Official description
On require() of the package, index.js loads vendor.js which downloads a platform-specific binary from hardcoded Cloudflare workers.dev hosts (oob-worker.cf10{1,2,3}-*.workers.dev) with a DNS-TXT chunked base64 fallback resolved via sdk.dl.wel1.ru, writes it to /tmp or the Windows Temp directory under a disguised name (.cache<hex> or dotnet_diag_<hex>.exe), chmods 755, and spawns it detached via /bin/sh -c "<path> &" or cmd.exe /c start /b. Destination hostnames and dangerous APIs are assembled by array-join and string concatenation (e.g. require("child_"+"process"), fs["chmod"+"Sync"]) to hinder pattern-matching. A second, structurally identical dropper is shipped in lib/telemetry.js under an 'Analytics SDK' label, providing a backup payload vector. The advertised purpose (a UI flag component) has no relationship to fetching and executing opaque native binaries from anonymous Workers hosts.
What should I do about MAL-2026-13155?
Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.