03-19-2022, 05:56 AM
(This post was last modified: 03-19-2022, 08:46 PM by HelmanFrow.)
Hi, first-time listener; first-time caller.
I've gone and locked myself out of a spreadsheet.
I first ran paid software called PassFab For Excel in trial mode.
While I didn't pay to get my results, I did note that the password is four characters long and contains only lower- and upper-case letters (I ran a custom brute-force attack). PassFab For Excel returned the results in about 12 minutes.
When I realized that PassFab wanted $20 for my 4-digit password I found JtR.
I extracted the file hash using office2john.py (which seems to produce a format that HashCat can use, as well).
I tried JtR in default mode but it doesn't recognize my GPU (Quadro M100M) for some reason, even after I edited the nvidia.icd file with the location of nvopencl.dll.
Then I found HashCat (which sees my GPU out of the box) and for the last few hours I've been breaking my head over learning the the syntax and I can't figure out which attack to use and how to structure it to search for passwords only 4 characters in length and with the character set I need.
It's probably simple enough but I'm a bit slow on the uptake, and now I'm tired and frustrated.
Please to help.
PS I'm on Windows 10.
I've gone and locked myself out of a spreadsheet.
I first ran paid software called PassFab For Excel in trial mode.
While I didn't pay to get my results, I did note that the password is four characters long and contains only lower- and upper-case letters (I ran a custom brute-force attack). PassFab For Excel returned the results in about 12 minutes.
When I realized that PassFab wanted $20 for my 4-digit password I found JtR.
I extracted the file hash using office2john.py (which seems to produce a format that HashCat can use, as well).
I tried JtR in default mode but it doesn't recognize my GPU (Quadro M100M) for some reason, even after I edited the nvidia.icd file with the location of nvopencl.dll.
Then I found HashCat (which sees my GPU out of the box) and for the last few hours I've been breaking my head over learning the the syntax and I can't figure out which attack to use and how to structure it to search for passwords only 4 characters in length and with the character set I need.
It's probably simple enough but I'm a bit slow on the uptake, and now I'm tired and frustrated.
Please to help.
PS I'm on Windows 10.