Which versions of zz_arcdata are malicious?

The following RubyGems versions of zz_arcdata are flagged malicious: 0.0.1. Treat any of these as compromised.

How do I remediate zz_arcdata if I installed it?

Remove zz_arcdata 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 zz_arcdata — how do I know if it already compromised me?

If zz_arcdata 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 zz_arcdata part of a known attack campaign?

Yes — zz_arcdata is associated with the RLMA-2026-04585, RLUA-2026-10523 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 zz_arcdata across my projects, lockfiles, and CI pipelines?

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

Malicious package

zz_arcdataRubyGems

Advisory published Jul 7, 2026Updated Sep 24, 2026

zz_arcdata is a confirmed malicious RubyGems package (MAL-2026-9934) 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 zz_arcdata (RubyGems)

MAL-2026-9934

Immediate action

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

gem uninstall zz_arcdata

Malicious versions

1 flagged

0.0.1

Indicators of compromise (SHA-256)

1339c6432aa120b49c3916fbb1a8b748011db86a148aa5a2a179596c73bc3b98

dbe48b43665e9746ce2bf4b725e78af1a0513797349cad80848e94152f0917c9

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for zz_arcdata (version 0.0.1).
If you installed it — respond
Remove zz_arcdata 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 zz_arcdata 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. zz_arcdata 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-2026-04585RLUA-2026-10523

References

github.com

Credits

ReversingLabs · finder

Detect & block this

O3 blocks zz_arcdata-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

All malware advisories How O3 detects malware Vulnerability database