当前位置:首页>安卓APP>CTF安卓逆向:阿里《第2届移动安全挑战》第一题 Cobb的记忆

CTF安卓逆向:阿里《第2届移动安全挑战》第一题 Cobb的记忆

  • 2026-01-30 16:00:39
CTF安卓逆向:阿里《第2届移动安全挑战》第一题 Cobb的记忆

阿里《第2届移动安全挑战》第一题 Cobb的记忆

一、APP分析

1.1 安装APP寻找线索

1.2 利用Jadx打开APK搜索提示词“这是Cobb暗恋班花的记忆, 奈何物是人非!”

1.2 搜索resp_invalid找到handleMessage函数

1.3通过分析handleMessage()方法

handleMessage()方法中参数 Message msg 是在onCreate()方法中onClick()方法中的run()方法调用Check.check()方法来的。

二、Android Killer静态分析

2.1在Android Killer中,在Check类中搜索return,最后一处是在check方法中

2.2搜索goto_0,分析最后三处,前面四个不在check方法中

2.3分析得出cmp-long v4, v4, v10关键函数,比较flag

const-wide/32 v4, 0xf4240rem-long v4, v8, v4const-wide/32 v6, 0x1e74eadd-long/2addr v4, v6cmp-long v4, v4, v10if-nez v4, :cond_3const/4 v4, 0x1goto/16 :goto_0

三、JEB 动态调试

3.1在cmp-long v4, v4, v10设置断点

3.2以Debug模式启动APP

adb shell am start -D -n k2015.a1/.Main

3.3发现v4一直是固定值520676,v10会根据输入的值而产生变化,

    v8 = 31395926v4 = v8 % 1000000 = 395926v6 = 124750v4 = v4 + v6 = 395926 + 124750 = 520676
    v10 = 395926 + 124750 = 520676

    四、Flag

    395926

    END

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    138. /yingpanguazai/ssd/ssd1/www/c.mffb.com.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
    139. /yingpanguazai/ssd/ssd1/www/c.mffb.com.cn/runtime/temp/cefbf809ba1a84190cb04b0cb7abcf79.php ( 11.98 KB )
    140. /yingpanguazai/ssd/ssd1/www/c.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
    1. CONNECT:[ UseTime:0.000926s ] mysql:host=127.0.0.1;port=3306;dbname=c_mffb;charset=utf8mb4
    2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001550s ]
    3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000733s ]
    4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001052s ]
    5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001395s ]
    6. SELECT * FROM `set` [ RunTime:0.000650s ]
    7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001461s ]
    8. SELECT * FROM `article` WHERE `id` = 461050 LIMIT 1 [ RunTime:0.039267s ]
    9. UPDATE `article` SET `lasttime` = 1770241699 WHERE `id` = 461050 [ RunTime:0.001472s ]
    10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.007645s ]
    11. SELECT * FROM `article` WHERE `id` < 461050 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.016512s ]
    12. SELECT * FROM `article` WHERE `id` > 461050 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.013671s ]
    13. SELECT * FROM `article` WHERE `id` < 461050 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.024704s ]
    14. SELECT * FROM `article` WHERE `id` < 461050 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.038689s ]
    15. SELECT * FROM `article` WHERE `id` < 461050 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.076601s ]
    0.383865s