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NODE *pNode, ULONG SearchResult );
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You now have some basic information on RtlRealInsertElement Worker. At this point, you re ready to take on the complete listing and try to figure out exactly how it works. The full disassembly of RtlRealInsert ElementWorker is presented in Listing 5.7.
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7C924DF0 7C924DF2 7C924DF3 7C924DF5 7C924DF9 7C924DFA 7C924DFB 7C924DFC 7C924E02 7C924E05 7C924E08 7C924E0B 7C924E0C 7C924E0D 7C924E10 7C924E12 7C924E14 7C924E1A 7C924E1E 7C924E22 7C924E24 7C924E27 7C924E2A 7C924E2D 7C924E2F 7C924E32 7C924E34 7C924E37 7C924E3A 7C924E3E 7C924E40 7C924E44 7C924E47 7C924E4D 7C924E50 7C924E52 7C924E55 7C924E57 MOV EDI,EDI PUSH EBP MOV EBP,ESP CMP DWORD PTR [EBP+1C],1 PUSH EBX PUSH ESI PUSH EDI JE ntdll.7C935D5D MOV EDI,DWORD PTR [EBP+10] MOV ESI,DWORD PTR [EBP+8] LEA EAX,DWORD PTR [EDI+18] PUSH EAX PUSH ESI CALL DWORD PTR [ESI+1C] MOV EBX,EAX TEST EBX,EBX JE ntdll.7C94D4BE AND DWORD PTR [EBX+4],0 AND DWORD PTR [EBX+8],0 MOV DWORD PTR [EBX],EBX LEA ECX,DWORD PTR [ESI+4] MOV EDX,DWORD PTR [ECX+4] LEA EAX,DWORD PTR [EBX+C] MOV DWORD PTR [EAX],ECX MOV DWORD PTR [EAX+4],EDX MOV DWORD PTR [EDX],EAX MOV DWORD PTR [ECX+4],EAX INC DWORD PTR [ESI+14] CMP DWORD PTR [EBP+1C],0 JE SHORT ntdll.7C924E88 CMP DWORD PTR [EBP+1C],2 MOV EAX,DWORD PTR [EBP+18] JE ntdll.7C924F0C MOV DWORD PTR [EAX+8],EBX MOV DWORD PTR [EBX],EAX MOV ESI,DWORD PTR [EBP+C] MOV ECX,EDI MOV EAX,ECX
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Listing 5.7 Disassembly of function at ntdll.7C924DF0.
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7C924E59 7C924E5C 7C924E5F 7C924E61 7C924E63 7C924E66 7C924E68 7C924E69 7C924E6E 7C924E71 7C924E73 7C924E76 7C924E78 7C924E7E 7C924E81 7C924E82 7C924E83 7C924E84 7C924E85 7C924E88 7C924E8A 7C924E8C 7C924E8E
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SHR ECX,2 LEA EDI,DWORD PTR [EBX+18] REP MOVS DWORD PTR ES:[EDI],DWORD PTR [ESI] MOV ECX,EAX AND ECX,3 REP MOVS BYTE PTR ES:[EDI],BYTE PTR [ESI] PUSH EBX CALL ntdll.RtlSplay MOV ECX,DWORD PTR [EBP+8] MOV DWORD PTR [ECX],EAX MOV EAX,DWORD PTR [EBP+14] TEST EAX,EAX JNZ ntdll.7C935D4F LEA EAX,DWORD PTR [EBX+18] POP EDI POP ESI POP EBX POP EBP RET 18 MOV DWORD PTR [ESI],EBX JMP SHORT ntdll.7C924E52 XOR EAX,EAX JMP ntdll.7C9214B6
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Listing 5.7 (continued)
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Like the function at Listing 5.6, this one also starts with that dummy MOV EDI, EDI instruction. However, unlike the previous function, this one doesn t seem to receive any parameters through registers, indicating that it was probably not defined using the static keyword. This function starts out by checking the value of the SearchResult parameter (the last parameter it takes), and making one of those remote, out of function jumps if SearchResult == 1. We ll deal with this condition later. For now, here s the code that gets executed when that condition isn t satisfied.
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7C924E02 7C924E05 7C924E08 7C924E0B 7C924E0C 7C924E0D MOV EDI,DWORD PTR [EBP+10] MOV ESI,DWORD PTR [EBP+8] LEA EAX,DWORD PTR [EDI+18] PUSH EAX PUSH ESI CALL DWORD PTR [ESI+1C]
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It seems that the TABLE data structure contains another callback pointer. Offset +1c appears to be another callback function that takes two parameters. Let s examine those parameters and try to figure out what the callback does. The first parameter comes from ESI and is quite clearly the TABLE pointer. What does
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the second parameter contain Essentially, it is the value of the third parameter passed to RtlRealInsertElementWorker plus 18 bytes (hex). When you looked earlier at the parameters that RtlRealInsertElementWorker takes, you had no idea what the third parameter was, but the number 0x18 sounds somehow familiar. Remember how RtlLocateNodeGenericTable added 0x18 (24 in decimal) to the pointer of the current element before it passed it to the TABLE_COMPARE_ELEMENTS callback I suspected that adding 24 bytes was a way of skipping the element s header and getting to the actual data. This corroborates that assumption it looks like elements in a generic table are each stored with 24-byte headers that are followed by the element s data. Let s dig further into this function to try and figure out how it works and what the callback does. Here s what happens after the callback returns.
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7C924E10 7C924E12 7C924E14 7C924E1A 7C924E1E 7C924E22 7C924E24 7C924E27 7C924E2A 7C924E2D 7C924E2F 7C924E32 7C924E34 7C924E37 7C924E3A 7C924E3E 7C924E40 7C924E44 7C924E47 7C924E4D 7C924E50 MOV EBX,EAX TEST EBX,EBX JE ntdll.7C94D4BE AND DWORD PTR [EBX+4],0 AND DWORD PTR [EBX+8],0 MOV DWORD PTR [EBX],EBX LEA ECX,DWORD PTR [ESI+4] MOV EDX,DWORD PTR [ECX+4] LEA EAX,DWORD PTR [EBX+C] MOV DWORD PTR [EAX],ECX MOV DWORD PTR [EAX+4],EDX MOV DWORD PTR [EDX],EAX MOV DWORD PTR [ECX+4],EAX INC DWORD PTR [ESI+14] CMP DWORD PTR [EBP+1C],0 JE SHORT ntdll.7C924E88 CMP DWORD PTR [EBP+1C],2 MOV EAX,DWORD PTR [EBP+18] JE ntdll.7C924F0C MOV DWORD PTR [EAX+8],EBX MOV DWORD PTR [EBX],EAX
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This code tests the return value from the callback. If it s zero, the function jumps into a remote block. Let s take a quick look at that block.
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7C94D4BE 7C94D4C1 7C94D4C3 7C94D4C5 7C94D4C7 7C94D4C9 MOV EAX,DWORD PTR [EBP+14] TEST EAX,EAX JE SHORT ntdll.7C94D4C7 MOV BYTE PTR [EAX],BL XOR EAX,EAX JMP ntdll.7C924E81
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This appears to be some kind of failure mode that essentially returns 0 to the caller. Notice how this sequence checks whether the fourth parameter at
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