Showing posts from March, 2014

mimikatz offline addendum

I must admit I did not expect so many acknowledgments by writing the volatility mimikatz plugin. I want to say thanks to all people that tweeted, emailed - and so on - me: it is just a piece of the puzzle, and the big pieces are those from volatility and from mimikatz.
First, I want to say thanks to Andrew Case, for the support and for having tweeted about the plugin: probably all those acks are because Andrew is an uber-well-known DFIR expert! Then I want to say thanks to Kristinn Gudjonsson, my favorite plaso “harsh” reviewer, who spotted some “devil” (you wrote it! ;) issues in my code, as the multiple inheritance I used… lol, I will fix it! Last but not least I want to once again say thanks to Benjamin aka gentilkiwi, who wrote an e-mail to me making the congratulations for the plugin.
With this post, I want to point out some features of mimikatz that I had not considered in the first instance.
mimikatz can work offline
In the previous post I wrote “Mimikatz is "normally" us…

et voilà le mimikatz offline

In one of my recent cases, I needed to recover the windows user password: I had different OSes with various levels of cryptography, mainly at file level. Usually I think it's a good approach to recover as many hints as possible, to derive a scheme and/or to find a way to access the data. 
I like to call it ODI (Offensive Digital Investigations, in Italian "odi" means hear, find out). I remember an old case where I got 500+ strong encrypted archives... too many without a password catalog. I searched for the weakest protection and I found three zip-crypto (not a strong protection) archives: I cracked them in few days and then I was able to derive the schema to access all of them. I was lucky.

This time I felt that the Windows user password was the... key. Usually the dirty work is made with rainbow tables, but no way: I was unable to crack the Windows 7 user password.

I don't remember exactly why I was playing with mimikatz (hem, coff coff) but I had a drea…