What does the fdir5 malware do?

The package fdir5 was found to contain malicious code. The OpenSSF Package Analysis project identified 'fdir5' @ 99.99.2 (npm) as malicious. It is considered malicious because: - The package communicates with a domain associated with malicious activity. - The package executes one or more commands associated with malicious behavior.

Which versions of fdir5 are malicious?

The following npm versions of fdir5 are flagged malicious: 99.99.2. Treat any of these as compromised.

How do I remediate fdir5 if I installed it?

Remove fdir5 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 fdir5 — how do I know if it already compromised me?

If fdir5 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.

How do I find fdir5 across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for fdir5 (version 99.99.2).

Malicious package

fdir5npm

Advisory published Dec 6, 2025Updated Dec 10, 2025

fdir5 is a confirmed malicious npm package (MAL-2025-192356) that executes malicious code on install (malicious version 99.99.2). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in fdir5 (npm)

MAL-2025-192356

Immediate action

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

npm uninstall fdir5

What this malware does

The package fdir5 was found to contain malicious code.

The OpenSSF Package Analysis project identified 'fdir5' @ 99.99.2 (npm) as malicious.

It is considered malicious because:

The package communicates with a domain associated with malicious activity.
The package executes one or more commands associated with malicious behavior.

Malicious versions

1 flagged

99.99.2

Indicators of compromise (SHA-256)

5fbb878466820a17ee68843707334225006abad5203a6e4fbc61130d466028bc

0e6863b32353d63e9eecdc0ff2ce31db470ed49deb7ccdee067795e37e92bb72

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for fdir5 (version 99.99.2).
If you installed it — respond
Remove fdir5 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 fdir5 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. fdir5 on npm has been identified as a malicious package (version 99.99.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Credits

Amazon Inspector · finder
OpenSSF: Package Analysis · finder

Detect & block this

O3 blocks fdir5-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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