Which versions of logstash_codec-bytes are malicious?

The following RubyGems versions of logstash_codec-bytes are flagged malicious: 2.0.0. Treat any of these as compromised.

How do I remediate logstash_codec-bytes if I installed it?

Remove logstash_codec-bytes 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 logstash_codec-bytes — how do I know if it already compromised me?

If logstash_codec-bytes 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 logstash_codec-bytes part of a known attack campaign?

Yes — logstash_codec-bytes is associated with the RLMA-2024-05790, RLUA-2024-10310, RLUA-2026-08520 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 logstash_codec-bytes across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for logstash_codec-bytes (version 2.0.0).

Malicious package

logstash_codec-bytesRubyGems

Advisory published Jun 25, 2024Updated Sep 24, 2026

logstash_codec-bytes is a confirmed malicious RubyGems package (MAL-2024-6984) that executes malicious code on install (malicious version 2.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in logstash_codec-bytes (RubyGems)

MAL-2024-6984

Immediate action

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

gem uninstall logstash_codec-bytes

Malicious versions

1 flagged

2.0.0

Indicators of compromise (SHA-256)

691c89bb8fd98949a8d1632dc980e6eb6f605d28413a84a39efc9cbe86e04a7f

c91a571b32a09667a81e7673a88ac63bc9aa3686cd35afb09c1480b19ea5944c

9fe755af9a4540cb723c24194e7957f11fb435a12c0fadf0c199aa7fa897904a

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for logstash_codec-bytes (version 2.0.0).
If you installed it — respond
Remove logstash_codec-bytes 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 logstash_codec-bytes 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. logstash_codec-bytes on RubyGems has been identified as a malicious package (version 2.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2024-05790RLUA-2024-10310RLUA-2026-08520

References

Credits

ReversingLabs · finder

Detect & block this

O3 blocks logstash_codec-bytes-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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