Which versions of logstash_codec-cef are malicious?

The following RubyGems versions of logstash_codec-cef are flagged malicious: 2.1.3. Treat any of these as compromised.

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

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

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

Yes — logstash_codec-cef is associated with the RLMA-2024-05791, RLUA-2024-10311, RLUA-2026-08521 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-cef across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for logstash_codec-cef (version 2.1.3).

Malicious package

logstash_codec-cefRubyGems

Advisory published Jun 25, 2024Updated Sep 24, 2026

logstash_codec-cef is a confirmed malicious RubyGems package (MAL-2024-6985) that executes malicious code on install (malicious version 2.1.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in logstash_codec-cef (RubyGems)

MAL-2024-6985

Immediate action

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

gem uninstall logstash_codec-cef

Malicious versions

1 flagged

2.1.3

Indicators of compromise (SHA-256)

ea437f7d6f23de142837691a85a20b75c028728df2442d35a304a9387089ade0

cf751ba1092a77af9035a4bb3d7adbc98ca85ce0c8d2c63a084608060a9d263b

cc998053dfc93bd0bc49e42bd0c2875e6935974301387f500156373d394693cc

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for logstash_codec-cef (version 2.1.3).
If you installed it — respond
Remove logstash_codec-cef 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-cef 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-cef on RubyGems has been identified as a malicious package (version 2.1.3 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2024-05791RLUA-2024-10311RLUA-2026-08521

References

Credits

ReversingLabs · finder

Detect & block this

O3 blocks logstash_codec-cef-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