> 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/binary-analysis/userinfo-exe-binary-analysis.md).

# Análise Binária do UserInfo.exe

Esta nota mostra um simples Windows `.NET` fluxo de trabalho de análise binária: execução controlada, observação do comportamento e inspeção com dnSpy para recuperar informações sensíveis.

## Preparação

Prepare o ambiente de laboratório, transfira o arquivo e configure a resolução de nomes, se necessário.

<figure><img src="/files/89f870bf6ccd9729fe016c1123aec36a0e1d8177" alt="UserInfo.exe lab preparation"><figcaption></figcaption></figure>

<figure><img src="/files/66fe1f85822c7bd9f79697bb88cbdfe8d000a983" alt="UserInfo.exe archive transferred"><figcaption></figcaption></figure>

## Execução Controlada

```powershell
./UserInfo.exe find -first * -last *
```

<figure><img src="/files/fe9ecaa144765ecfd35c4c86075f1f36a018a028" alt="UserInfo.exe controlled execution"><figcaption></figcaption></figure>

## Analise com dnSpy

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

<figure><img src="/files/a54838dbad8afd4cb1124e8445617b22cdbe1925" alt="UserInfo.exe opened in dnSpy"><figcaption></figcaption></figure>

Procure por strings, funções de autenticação, endpoints e segredos codificados no binário.

<figure><img src="/files/ccc5a138047e58a4ddd6f3e0e182e46508dac30f" alt="Searching UserInfo.exe code in dnSpy"><figcaption></figcaption></figure>

Defina um breakpoint perto do caminho de código em que o segredo se torna legível.

<figure><img src="/files/fccde5a8b7255fc3af162d04aa0b51dd5720736e" alt="Breakpoint set in dnSpy"><figcaption></figcaption></figure>

<figure><img src="/files/84856a54419f0cb5b299240bdf80c0a9b7c2da11" alt="Recovered runtime secret in dnSpy"><figcaption></figcaption></figure>

## Pontos-chave

* `.NET` binários geralmente são fáceis de descompilar.
* Segredos codificados no binário devem ser tratados como comprometidos.
* A análise estática deve ser combinada com a execução controlada em um laboratório.


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