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Malicious package

zexcoknh41ysf13RubyGems

Advisory published Updated

zexcoknh41ysf13 is a confirmed malicious RubyGems package (MAL-2026-9565) that executes malicious code on install (malicious version 0.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in zexcoknh41ysf13 (RubyGems)

MAL-2026-9565
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
gem uninstall zexcoknh41ysf13

Malicious versions

1 flagged
0.0.1

Indicators of compromise (SHA-256)

1edb72a91d8e718704a773b8b9f71df229864f28b483bd05d0f2d8e11a4cfbbb
88feaaf14f36b08723c2cc22110194dfcf008b01f9379940d133624cbf88961b

Detection & response playbook

Malicious package
  1. Find it

    Search your lockfiles and build artifacts for zexcoknh41ysf13 (version 0.0.1).

  2. If you installed it — respond

    Remove zexcoknh41ysf13 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 zexcoknh41ysf13 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. zexcoknh41ysf13 on RubyGems has been identified as a malicious package (version 0.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-04216RLUA-2026-10153

References

Credits

  • ReversingLabs · finder

Detect & block this

O3 blocks zexcoknh41ysf13-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

zexcoknh41ysf13 (RubyGems) malicious package — MAL-2026-9565 | O3 Security