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Archive for May, 2021

PuTTY And FileZilla Use The Same Fingerprint Registry Keys, (Sun, May 2nd)

Many SSH clients can remember SSH servers’ fingerprints. This can serve as a safety mechanism: you get a warning when the server you want to connect to, has no longer the same fingerprint. And then you can decide what to do: continue with the connection, or stop and try to figure out what is going on.

This happened to me a couple of months ago. I wanted to transfer some files over SSH with FileZilla, and received a prompt that the server I usually connect to, had an unknown fingerprint. I did not go through with the connection, and started to investigate what was going on.

Long story short: I had removed SSH fingerprints cached by PuTTY in the Windows registry, and this impacted FileZilla: both use the same registry keys for their fingerprint cache.

You can see the registry keys here in FileZilla’s source code:

If you do forensics on Windows machines, be aware that these registry keys are not only used by PuTTY, but also by FileZilla’s fzsftp.exe module.

I have more details here if you are interested.

 

Didier Stevens
Senior handler
Microsoft MVP
blog.DidierStevens.com DidierStevensLabs.com

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

Reposted from SANS. View original.

Posted in: SANS

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YARA Release v4.1.0, (Sat, May 1st)

YARA version 4.1.0 was released.

There are no major changes. Some new string testing functions: icontains, …

Most surprising to me was the addition of the t escape sequence in text strings. I didn’t know this wasn’t supported in prior versions.

 

Didier Stevens
Senior handler
Microsoft MVP
blog.DidierStevens.com DidierStevensLabs.com

(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.

Reposted from SANS. View original.

Posted in: SANS

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