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Android 逆向之旅(下)
1.
Android 逆向之旅(下)
2.
3.
實驗環境 • 手機實機(室友舊手機…):HTC Sensation
XL with Beats Audio X315e • Rooted • HT 版 pad 可以在 root 環境下執行 • 針對 HT 版分析 • 環境: • Android 4.0.3 • Windows 8.1 64bit • Android NDK • Android SDK
4.
Xposed • 替換 app_process •
On package load Hook • Load libFKPAD.so to jp.gunho.pad
5.
libFKPAD.so • 載入時間點為 libpad.so
已經解密後 • 直接從 memory dump data • Read /proc/self/maps • Find start, end address of segments of libpad.so
6.
靜態分析 • 目前狀態: • 有四個
Raw memory dump file • 知道當前 maps 映射表 • 拼湊現場 • IDA load each data at its location
7.
靜態分析
8.
靜態分析 • 找出符號表
9.
ELF 結構
10.
11.
12.
13.
靜態分析 – 找出符號表 •
Find program header of type PT_DYNAMIC • 撈出 SYMTAB, STRTAB 等表訊息
14.
SYMTAB
15.
STRTAB
16.
靜態分析 --- 針對有興趣函式分析
17.
動態分析 • 觀察參數 =>
Hook • 動態分析觀察 • android_server (ida) • 規避雙進程保護 • 一個進程只能被attach一次
18.
規避方式 • Hook +
fork • 凍結 (Sleep) 原進程
19.
20.
成果
21.
Demo • https://www.youtube.com/watch?v=QpO2mF7egqU
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