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FilterConnectionPorts

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Under windows 10 there are some very strange objects in root directory
They are created by Filter Manager (fltmgr.sys) and is used for communication between user-mode applications and filesystem minifilters. Lets see how we can enumerate and dump this


from function fltmgr!FltCreateCommunicationPort:
PAGE:0003A159   lea   eax, [ebp+var_20]
PAGE:0003A15C   push  eax
PAGE:0003A15D   xor   eax, eax
PAGE:0003A15F   push  eax
PAGE:0003A160   push  eax
PAGE:0003A161   push  28h ; size
PAGE:0003A163   push  eax
PAGE:0003A164   push  eax
PAGE:0003A165   push  [ebp+arg_8]
PAGE:0003A168   push  FilterConnectionPortType ; object type
PAGE:0003A16E   push  eax
PAGE:0003A16F   call  ds:__imp__ObCreateObject@36   


so size of FilterConnectionPort is 0x28 and this is _FLT_SERVER_PORT_OBJECT struct:
kd> dt fltmgr!_FLT_SERVER_PORT_OBJECT
   +0x000 FilterLink       : _LIST_ENTRY
   +0x008 ConnectNotify    : Ptr32     long
   +0x00c DisconnectNotify : Ptr32     void
   +0x010 MessageNotify    : Ptr32     long
   +0x014 Filter           : Ptr32 _FLT_FILTER
   +0x018 Cookie           : Ptr32 Void
   +0x01c Flags            : Uint4B
   +0x020 NumberOfConnections : Int4B
   +0x024 MaxConnections   : Int4B


Sample of wincheck output:
FilterConnectionPortType 8998CBF0 at 84DBBDF0
MicrosoftMalwareProtectionControlPortWD:
 ConnectNotify: 81A68DA8 \SystemRoot\system32\drivers\WdFilter.sys
 DisconnectNotify: 81A79706 \SystemRoot\system32\drivers\WdFilter.sys
 MessageNotify: 81A60EE0 \SystemRoot\system32\drivers\WdFilter.sys
 Cookie: 899958AC
 Flags:  0
 NumberOfConnections: 1
 MaxConnections:      1
storqosfltport:
 ConnectNotify: 858DD716 \SystemRoot\system32\drivers\storqosflt.sys
 DisconnectNotify: 858DD7CE \SystemRoot\system32\drivers\storqosflt.sys
 MessageNotify: 858DD818 \SystemRoot\system32\drivers\storqosflt.sys
 Cookie: 00000000
 Flags:  0
 NumberOfConnections: 0
 MaxConnections:      1
MicrosoftMalwareProtectionAsyncPortWD:
 ConnectNotify: 81A68DA8 \SystemRoot\system32\drivers\WdFilter.sys
 DisconnectNotify: 81A79706 \SystemRoot\system32\drivers\WdFilter.sys
 Cookie: 899958CC
 Flags:  0
 NumberOfConnections: 1
 MaxConnections:      1
MicrosoftMalwareProtectionPortWD:
 ConnectNotify: 81A68DA8 \SystemRoot\system32\drivers\WdFilter.sys
 DisconnectNotify: 81A79706 \SystemRoot\system32\drivers\WdFilter.sys
 Cookie: 899958B4
 Flags:  0
 NumberOfConnections: 1
 MaxConnections:      1
WcifsPort:
 ConnectNotify: 8DBAE402 \SystemRoot\system32\drivers\wcifs.sys
 DisconnectNotify: 8DBAE41A \SystemRoot\system32\drivers\wcifs.sys
 MessageNotify: 8DBAE43E \SystemRoot\system32\drivers\wcifs.sys
 Cookie: 00000000
 Flags:  0
 NumberOfConnections: 0
 MaxConnections:      3E8
MicrosoftMalwareProtectionRemoteIoPortWD:
 ConnectNotify: 81A68DA8 \SystemRoot\system32\drivers\WdFilter.sys
 DisconnectNotify: 81A79706 \SystemRoot\system32\drivers\WdFilter.sys
 Cookie: 899958C4
 Flags:  0
 NumberOfConnections: 1
 MaxConnections:      1
WcnfsPort:
 ConnectNotify: 8DBC8D84 \SystemRoot\system32\drivers\wcnfs.sys
 DisconnectNotify: 8DBC8D9C \SystemRoot\system32\drivers\wcnfs.sys
 MessageNotify: 8DBC8DC0 \SystemRoot\system32\drivers\wcnfs.sys
 Cookie: 00000000
 Flags:  0
 NumberOfConnections: 0
 MaxConnections:      3E8
MicrosoftMalwareProtectionVeryLowIoPortWD:
 ConnectNotify: 81A68DA8 \SystemRoot\system32\drivers\WdFilter.sys
 DisconnectNotify: 81A79706 \SystemRoot\system32\drivers\WdFilter.sys
 Cookie: 899958BC
 Flags:  0
 NumberOfConnections: 1
 MaxConnections:      1

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