What does the dolyame-ui-utils malware do?

On require of the package, _polyfill.js selects a platform-keyed URL, fetches an opaque binary over HTTPS from string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev) with a base64-chunked DNS-TXT fallback channel over *.dl.wel1.ru, writes it to /tmp/.cache_ or %TEMP%\dotnet_diag_ .exe, chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start. No hash or signature verification is performed and destinations are unrelated to the package publisher. lib/telemetry.js ships a parallel dropper implementation with additional evasion (split require("child_"+"process"), dynamic fs["chmod"

Which versions of dolyame-ui-utils are malicious?

The following npm versions of dolyame-ui-utils are flagged malicious: 35.6.7. Treat any of these as compromised.

How do I remediate dolyame-ui-utils if I installed it?

dolyame-ui-utils is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed dolyame-ui-utils — how do I know if it already compromised me?

If dolyame-ui-utils was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Is dolyame-ui-utils part of a known attack campaign?

Yes — dolyame-ui-utils is associated with the IN-MAL-2026-015578 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find dolyame-ui-utils across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for dolyame-ui-utils (version 35.6.7).

Malicious package

dolyame-ui-utilsnpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

dolyame-ui-utils is a confirmed malicious npm package (MAL-2026-13199) that steals credentials and exfiltrates sensitive data (malicious version 35.6.7). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in dolyame-ui-utils (npm)

MAL-2026-13199

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall dolyame-ui-utils

What this malware does

On require of the package, polyfill.js selects a platform-keyed URL, fetches an opaque binary over HTTPS from string-split-obfuscated Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev) with a base64-chunked DNS-TXT fallback channel over *.dl.wel1.ru, writes it to /tmp/.cache<hex> or %TEMP%\dotnet_diag_<hex>.exe, chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start. No hash or signature verification is performed and destinations are unrelated to the package publisher. lib/telemetry.js ships a parallel dropper implementation with additional evasion (split require("child_"+"process"), dynamic fs["chmod"+"Sync"]) as staged secondary payload. An analytics_state marker file and DISABLE_TELEMETRY env var provide cover framing.

Malicious versions

1 flagged

35.6.7

Indicators of compromise (SHA-256)

899f518db368635c0c794a8097fc0af3a2c85f61cdb4dcfbd81b0cf85629f199

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for dolyame-ui-utils (version 35.6.7).
If you installed it — respond
dolyame-ui-utils is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If dolyame-ui-utils was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. dolyame-ui-utils on npm has been identified as a malicious package (version 35.6.7 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015578

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks dolyame-ui-utils-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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