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Part of a larger attack: @douinfe published 10 malicious packages. See the full campaign →
Malicious package

@douinfe/semi-theme-defaultnpm

Advisory published Updated

@douinfe/semi-theme-default is a confirmed malicious npm package (MAL-2025-763) that executes malicious code on install (malicious version 9.3.5). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @douinfe/semi-theme-default (npm)

MAL-2025-763
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall @douinfe/semi-theme-default

Malicious versions

1 flagged
9.3.5

Indicators of compromise (SHA-256)

f475284aef9c273bb51bc6266e9835c95ba83b8ba879038cc601440383ae0c71

Detection & response playbook

Malicious package
  1. Find it

    Search your lockfiles and build artifacts for @douinfe/semi-theme-default (version 9.3.5).

  2. If you installed it — respond

    Remove @douinfe/semi-theme-default 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.

  3. Did it already run?

    If @douinfe/semi-theme-default 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. @douinfe/semi-theme-default on npm has been identified as a malicious package (version 9.3.5 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2025-00009

Credits

  • ReversingLabs · finder

Detect & block this

O3 blocks @douinfe/semi-theme-default-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.

Explore

@douinfe/semi-theme-default (npm) malicious package — MAL-2025-763 | O3 Security