What does the fef3434334dwrg malware do?

Installing the package starts an infostealer Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers. Campaign: 2023-12-fefeefrrg Reasons (based on the campaign): - infostealer - The package overrides the install command in setup.py to execute malicious code during installation. - exfiltration-generic - exfiltration-browser-data - The package contains code to detect if it is running in a sandbox environment.

Which versions of fef3434334dwrg are malicious?

The following PyPI versions of fef3434334dwrg are flagged malicious: 1.0. Treat any of these as compromised.

How do I remediate fef3434334dwrg if I installed it?

fef3434334dwrg is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed fef3434334dwrg — how do I know if it already compromised me?

If fef3434334dwrg 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 fef3434334dwrg part of a known attack campaign?

Yes — fef3434334dwrg is associated with the RLMA-2024-03914, RLUA-2024-08270, 2023-12-fefeefrrg, RLUA-2026-00318 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 fef3434334dwrg across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for fef3434334dwrg (version 1.0).

Malicious package

fef3434334dwrgPyPI

Advisory published Jun 25, 2024Updated Mar 19, 2026

fef3434334dwrg is a confirmed malicious PyPI package (MAL-2024-5134) that steals credentials and exfiltrates sensitive data (malicious version 1.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in fef3434334dwrg (PyPI)

MAL-2024-5134

Immediate action

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

pip uninstall fef3434334dwrg

What this malware does

Installing the package starts an infostealer

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2023-12-fefeefrrg

Reasons (based on the campaign):

infostealer
The package overrides the install command in setup.py to execute malicious code during installation.
exfiltration-generic
exfiltration-browser-data
The package contains code to detect if it is running in a sandbox environment.

Malicious versions

1 flagged

1.0

Indicators of compromise (SHA-256)

051e562b712ce090e22977f771a61ec5f8e4a5cb0acbe9a3cf768f68b8533f38

b43476dd93328c77657d0a9c468ce1bad1942932de862b3be02e9010578c6c82

735b89c55992eb74dbad3a7b3391cb73ba8616e88e5d766406550bd97f85ee2c

c2b2e5c701437968432a35bd57be234d6c8f6141a3607819413ae3f88fc0101c

d8a9fd884768864bbfb2bc5eeeee3c82b788fe651fd7cb19763f1953d877761f

dc3d6324966e27e10d8e7cf9c84c82885998d348bcb517982cc02120cfb39c4a

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for fef3434334dwrg (version 1.0).
If you installed it — respond
fef3434334dwrg is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If fef3434334dwrg 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. fef3434334dwrg on PyPI has been identified as a malicious package (version 1.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2024-03914RLUA-2024-082702023-12-fefeefrrgRLUA-2026-00318

References

bad-packages.kam193.eu

Credits

Kamil Mańkowski (kam193)
ReversingLabs · finder

Detect & block this

O3 blocks fef3434334dwrg-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

All malware advisories How O3 detects malware Vulnerability database