What does the dolyame-ui-flag malware do?

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_ or dotnet_diag_ .exe), chmods 755, and spawns it detached via /bin/sh -c " &" 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

Which versions of dolyame-ui-flag are malicious?

The following npm versions of dolyame-ui-flag are flagged malicious: 35.7.6. Treat any of these as compromised.

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

Remove dolyame-ui-flag from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

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

If dolyame-ui-flag 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-flag part of a known attack campaign?

Yes — dolyame-ui-flag is associated with the IN-MAL-2026-015621 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-flag across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for dolyame-ui-flag (version 35.7.6).

Malicious package

dolyame-ui-flagnpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

dolyame-ui-flag is a confirmed malicious npm package (MAL-2026-13155) that executes malicious code on install (malicious version 35.7.6). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in dolyame-ui-flag (npm)

MAL-2026-13155

Immediate action

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

npm uninstall dolyame-ui-flag

What this malware does

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.

Malicious versions

1 flagged

35.7.6

Indicators of compromise (SHA-256)

be48c86f2b67912c3cfa1849431e5eb3d45510c55bb1fa98ab304dc36d25097b

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for dolyame-ui-flag (version 35.7.6).
If you installed it — respond
Remove dolyame-ui-flag from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If dolyame-ui-flag 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-flag on npm has been identified as a malicious package (version 35.7.6 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015621

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks dolyame-ui-flag-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

Explore

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