11/9/2022 0 Comments Ntlm hash calculator![]() Skipcount for the next node becomes the limit of the first. You add 1 to the counter, so the first item has a counter value of 1, and the case of your first item the skip count is zero and the limit is calculated by multiplying the chunk size by its gpu count and then adding the remainder. Now you start a counter at 0, loop into the array. Your remainder your chunk size multiplied by your total number of gpu's and then take that value and subtract it from your keyspace, it should be small or 0. Your chunk size is your keyspace divided by total number of gpu's. You also define an array with the count of gpu's in each of your system for example (4 4 4 4) would be 4 nodes with 4 GPU's each for a total of 32 GPU's. ![]() In the script the keyspace is 34359738368 or the value of the first argument. In hashcat it has the ability to assign a chunk of a workload and not all of it, -s skips ahead to the section of keyspace you want to start at and -l tells hashcat to stop after processing a portion of the keyspace, while -keyspace tells you the size of the total keyspace. So hell with it lets automate it, I wrote a handy skip and limit calculator detailed here and what it does is generates -s and -l values for you. With more nodes comes management, -s and -l work for this but running the calculations by hand sucks and using middleware sucks even more. This is doable on a longer term engagement but I don't usually have that kind of time, we need more nodes. #Ntlm hash calculator crack#Step 6: crack this on hashcat in mode 14000, if you have 8x GTX 980's you should crack it in a maximum time of 11 days, with a median time of 5.5 days. mschapv2.sh "ESIzRFVmd4hye041 UcSnqUrN7a6Gk0WGw="Īnd you have a hashes.txt file for mode 14000 and your pt3 file for putting this together So you need to make a hashes.txt comprised of CT1:CHAL\nCT2:CHAL essentially. Step 4: CT1 and CT2 are both generated from the same challenge as explained in atoms post here so we can multicrack them, bonus. Step 3: CT1 = bytes 9 - 16, CT2 = bytes 17 to 24, PT3 = bytes 25 - 28, CHAL (Challenge) = first 8 bytes from the hex dump ![]() Step 2: take hash echo it with a newline and pipe to base64 with the decode flag and then pipe it to xxd for a hex dump like so "echo -n 'ESIzRFVmd4hye041 UcSnqUrnN7a6Gk0WGw=' | base64 -d | xxd" Remove the $99, hash will look like this "$99ESIzRFVmd4hye041 UcSnqUrN7a6Gk0WGw=' and 'ESIzRFVmd4hye041 UcSnqUrN7a6Gk0WGw=' when done. Step 1: obtain $99 (MSCHAPv2 or NetNTLMv1). This demo used $99 format which is MSCHAPv2 and can be calculated by following the guide here and ![]() So as we all know mode 14000 generic DES can be used for evil, particularly for MSCHAPv2, I spoke at Derb圜on and here's the writeup I promised. ![]()
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