API hooking o Usermode n Win 32 API
- Slides: 20
API hooking o User-mode n Win 32 の API を Hooking o o 演習 3の研究内容(Detours) Kernel-mode n Native API を Hooking 5
User-mode Hooking o Proxy DLL [3] n o API Patching [4] n n o DLL を置き換える API の中身を書き換える Detours IAT Patching [4][5] n n Import Address Table の値を書き換える Detours にもこの機能あり 6
Detours の適用例 Before ; ; Target Function Sleep: push ebp mov ebp, esp push ebx push esi push edi. . ; ; Trampoline Function Untimed. Sleep: jmp Sleep ; ; Detour Function Timed. Sleep: . . After [1 [2 [1 [1 byte] bytes] byte] ; ; Target Function Sleep: jmp Timed. Sleep [5 bytes] push edi ; Sleep+5. . ; ; Trampoline Function Untimed. Sleep: push ebp mov ebp, esp push ebx push esi jmp Sleep+5 ; ; Detour Function Timed. Sleep: . . jmp Untimed. Sleep 8
IAT Patching o o o Import Address Table を書き換える Detours にもこの機能あり この手法の文献は多い 10
Updating IAT DLL EXE 関数名 : IAT アドレス Create. File Open. File : : : 12
Using IAT for Hooking DLL EXE 関数名 : IAT アドレス Create. File Open. File : 自分の : : コード 13
IAT Patching の回避策 Getprocaddr(Load. Library(“kernel 32. dll”), “Create. File. A”) Kernel 32. dll 関数名 アドレス Create. File. A プログラム Open. File o プログラムの任意の場所で読み込める o IAT は関係ない 15
API & System Call Windows Unix系 API System Call 今までの System call での テクニックが利用可能 17
参考文献(1) An In-Depth Look into the Win 32 Portable Executable File Format (Part 1 & 2) 1. http: //www. msdn. microsoft. com/msdnmag/issues/02/02/PE/default. aspx http: //www. msdn. microsoft. com/msdnmag/issues/02/03/PE 2/default. aspx n n 2. Process-wide API spying n 3. http: //www. codeproject. com/system/api_spying_hack. asp API Spying Techniques n http: //www. internals. com/articles/apispy. htm 19
参考文献(2) 4. Detours n 5. Hooking Windows NT System Services n 6. http: //research. microsoft. com/sn/detours/ http: //www. windowsitlibrary. com/Content/356/06/1. html A Host Intrusion Prevention System for Windows Operating Systems n Roberto Battistoni, Emanuele Gabrielli, Luigi V. Mancini ESORICS 2004 20
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