前言
一年没打比赛了, 差一题进决赛, REV当时lin的第三个challenge没看出来是凯撒, 想得复杂了, 结果错失一次线下机会 >_<
T4ee
动态调试, nop掉反调试代码
发现处理过程为
- 置换
sub_412F20处理(这里看其他师傅的wp知道应该是rc4, 我是直接en逆的- buf字符串中每一位和下一位异或
最后和byte_41C004数组比较
逆过程则反过来
permut_table = [18, 157, 158, 161, 223, 37, 194, 130, 115, 251, 116, 227, 190, 128, 208, 109, 255, 127, 31, 111, 17, 74, 153, 118, 14, 67, 204, 75, 179, 69, 47, 154, 133, 0, 160, 3, 207, 246, 209, 41, 205, 22, 254, 15, 70, 144, 249, 178, 238, 114, 54, 65, 164, 220, 123, 27, 2, 24, 52, 19, 16, 49, 107, 252, 234, 183, 78, 110, 85, 64, 96, 72, 56, 60, 33, 57, 36, 120, 165, 63, 112, 216, 83, 11, 217, 35, 180, 198, 13, 201, 250, 129, 170, 167, 10, 163, 231, 39, 244, 172, 137, 132, 240, 210, 113, 12, 195, 124, 93, 193, 224, 186, 104, 98, 5, 131, 199, 82, 202, 142, 145, 42, 196, 147, 197, 30, 152, 215, 68, 226, 73, 177, 146, 173, 76, 247, 119, 230, 4, 25, 176, 89, 91, 232, 90, 150, 125, 225, 181, 175, 182, 106, 46, 218, 9, 122, 239, 200, 211, 59, 243, 143, 206, 135, 99, 228, 29, 213, 141, 21, 185, 117, 7, 156, 253, 126, 50, 184, 214, 23, 28, 20, 241, 162, 97, 138, 88, 94, 58, 235, 212, 151, 140, 26, 169, 166, 87, 171, 248, 148, 222, 192, 92, 86, 245, 102, 53, 62, 100, 139, 34, 40, 159, 79, 38, 44, 6, 84, 48, 229, 121, 77, 51, 237, 103, 174, 66, 134, 203, 189, 149, 233, 95, 45, 8, 136, 32, 55, 101, 1, 61, 219, 155, 81, 71, 168, 105, 221, 236, 187, 108, 80, 43, 191, 242, 188
]checklist = [44, 64, 206, 136, 234, 179, 167, 250, 190, 227, 50, 217, 139, 228, 28, 119, 252, 212, 118, 171, 135, 65, 176, 206, 245, 94, 97, 134, 168, 207, 113, 153, 92, 177
]for i in range(32, -1, -1):checklist[i] = checklist[i + 1] ^ checklist[i]flag_tmp = [0 for _ in range(34)]v6, v7 = 0, 0
for i in range(0, 34, 1):v7 = (v7 + 1) % 256v6 = (v6 + permut_table[v7]) % 256v5 = permut_table[v7]permut_table[v7] = permut_table[v6]permut_table[v6] = v5# brute force every bytefor k in range(1, 128):tmp = k ^ permut_table[(permut_table[v6] + permut_table[v7]) % 256]if tmp == checklist[i]:flag_tmp[i] = kprint(flag_tmp)change_table = [7, 3, 15, 18, 0, 6, 25, 21, 20, 2,29, 12, 14, 17, 5, 19, 11, 22, 8, 1, 27, 10, 31, 30, 4, 26, 28, 32, 33, 13,16, 9, 23, 24
]flag = ''
for i in range(34):flag += chr(flag_tmp[change_table[i]])print(flag)
这题很坑的地方是, 静态分析判断的函数调用顺序不是实际执行顺序, 很坑, 浪费了大量时间
动调几遍最后才确定的函数调用顺序
easy_xors
有一些花指令, 影响反编译, 直接读汇编
这里有个反调试, 直接nop掉, 或者用插件绕过
定位到xor代码
动调提取xor的数组, xor回去就行
checklist = [153, 72, 94, 189, 197, 155, 133, 150, 32, 252, 24, 178, 0, 197, 218, 192, 177, 200, 108, 129, 99, 189, 9, 80, 194, 187, 236, 51, 214, 215, 143, 175, 173, 206, 20, 237, 140, 206, 111, 169, 168, 2, 140, 144, 148, 103
]xor_list = [0xFF, 0x24, 0x3F, 0xDA, 0xBE, 0xA9, 0xB6, 0xF7, 0x12, 0x8F, 0x29, 0xD0, 0x73, 0xF7, 0xF7, 0xA2, 0x83, 0xAD, 0x5F, 0xB0, 0x51, 0x90, 0x3F, 0x68, 0xF6, 0x8C, 0xC1, 0x0A, 0xB7, 0xB5, 0xBC, 0x82, 0xCC, 0xFC, 0x67, 0xDE, 0xE9, 0xFF, 0x5B, 0xCB, 0xC9, 0x67, 0xEA, 0xF6, 0xA6, 0x1A
]flag = ''
for i in range(len(checklist)):flag += chr(checklist[i] ^ xor_list[i])print(flag)
小林的世界
一共三个challenges, 前两个的key是rot13处理, 第一个是hasaki, 第二个是vxnfnu
base64串
第三个challenge, 可以看到后面有个base64串, 解出来是DASCTF{hasaki-pdtzptz-vxnfnu}, 输入进去不对, 动态调试查看一下中间值, 发现输入进去的pdtzptz会变成uiyeuye, 猜测是凯撒加密, 偏移为5
pdtzytz凯撒解密回去, 就是kyoukou
最后得到flag: DASCTF{hasaki-kyoukou-vxnfnu}
Robbie gave up
Unity 逆向, dnSpy打开Robbie gave up_Data\Managed\Assembly-CSharp.dll, 定位到关键代码Robbie.win(), 这个关键函数的定位一个一个object看就行
// Robbie
// Token: 0x0600005C RID: 92 RVA: 0x0001080C File Offset: 0x0000EA0C
public static object Win()
{for (int i = GameManager.instance.orbs.Count; i < Robbie.data1.Length; i++){Robbie.data2[i] = (byte)(Robbie.data1[i] ^ i);}Type type = Assembly.Load(Robbie.data2).GetType("ClassLibrary1.Class1");object obj = type.GetConstructor(Type.EmptyTypes).Invoke(new object[0]);return type.GetMethod("Method").Invoke(obj, null).ToString();
}
和flag相关的数据都是硬编码在程序中的, 可以抽取关键逻辑出来, 在vscode装C#插件, 创建项目跑
当然也可以在线运行, 本地环境要求Microsoft.NETCore.App等SDK各种依赖, 需要一点配置时间
using System;
using System.Reflection;namespace ConsoleApp
{class Robbie{// Robbie// Token: 0x04000084 RID: 132private static int[] data1 = new int[]{77,91,146,3,7,5,6,7,12,9,10,11,243,242,14,15,168,17,18,19,20,21,22,23,88,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,188,61,62,63,78,94,248,77,68,241,79,138,105,241,75,7,129,108,26,39,57,34,114,35,38,58,49,37,57,52,122,56,61,51,48,48,20,65,0,6,68,23,19,9,72,0,4,75,40,34,61,79,29,30,22,22,90,120,123,125,92,121,122,123,124,125,126,127,208,196,130,131,200,132,133,135,232,8,43,63,140,141,142,143,144,145,146,147,116,149,180,183,147,152,170,155,156,141,158,159,160,167,162,163,164,165,166,167,38,134,170,171,172,141,174,175,176,241,178,179,180,181,182,167,184,153,186,187,188,191,190,191,196,193,194,195,196,197,198,199,206,201,202,203,204,205,206,207,208,81,210,211,212,215,214,215,216,217,218,219,223,221,190,90,224,225,242,227,228,245,230,231,232,233,250,235,236,253,238,239,240,241,242,243,228,245,246,247,248,249,250,251,252,253,254,255,320,302,258,259,335,261,262,263,264,329,266,267,408,270,270,271,272,273,274,275,276,277,278,279,280,281,282,283,284,285,286,287,288,321,290,291,296,293,294,295,296,297,298,299,300,301,302,303,304,305,306,307,308,309,310,311,312,313,314,315,316,317,318,319,320,321,322,323,324,325,326,327,328,329,330,331,332,333,334,335,336,337,338,339,340,341,342,343,344,377,346,347,340,349,350,351,352,353,354,355,356,357,358,359,352,329,362,363,292,365,366,367,368,369,370,371,372,373,374,375,342,269,287,259,264,381,382,383,276,398,386,387,388,421,390,391,392,409,394,395,396,399,398,399,400,401,402,403,404,405,406,407,408,409,410,411,444,413,414,511,398,467,465,465,455,421,422,423,316,426,426,427,428,493,430,431,432,437,434,435,436,423,438,439,440,441,442,443,444,445,446,447,448,449,450,451,388,453,454,391,486,443,431,423,419,430,462,463,476,465,466,467,468,437,470,471,472,475,474,475,476,459,478,479,480,481,482,483,484,485,486,487,488,489,490,491,428,493,494,429,496,497,498,499,500,501,502,503,504,505,506,507,508,509,510,511,624,558,514,515,516,517,518,519,576,521,522,523,526,525,523,527,672,565,530,531,644,543,534,535,537,537,538,539,540,541,542,543,544,545,546,547,548,549,550,551,552,553,554,555,556,557,558,559,560,561,562,563,564,565,566,567,568,569,570,571,572,573,574,575,576,577,578,579,580,581,582,583,584,585,586,587,588,589,590,591,590,595,634,579,596,597,604,637,558,603,626,587,604,605,596,605,531,624,610,611,622,536,613,615,616,621,616,537,517,621,622,543,525,627,626,627,624,607,556,629,515,632,634,635,632,593,633,637,763,640,642,643,640,687,644,764,650,649,650,655,678,767,653,679,646,657,658,665,697,647,660,703,655,665,666,657,671,754,646,671,672,683,650,687,676,677,672,653,683,643,728,680,644,699,686,687,698,668,672,667,675,693,694,701,698,698,658,688,700,701,696,720,729,705,706,713,750,710,748,665,715,741,728,739,731,717,718,709,722,722,762,735,724,725,720,696,704,729,730,721,758,713,756,641,739,717,752,737,716,754,742,743,738,746,645,754,748,749,740,711,763,753,754,757,734,737,732,645,762,642,761,763,764,761,657,741,768,769,776,796,836,811,778,773,778,882,776,779,780,777,806,778,784,785,788,825,854,790,782,831,827,793,794,785,770,770,814,880,772,801,802,809,782,775,805,831,768,780,810,811,806,775,814,815,803,769,816,819,806,821,822,823,825,825,826,810,846,828,830,831,816,843,817,832,836,837,832,833,864,846,842,843,842,871,846,847,835,865,849,851,950,853,854,855,858,857,858,842,862,806,861,863,864,869,781,881,868,869,876,869,875,788,875,875,876,873,876,788,881,881,882,887,857,856,884,780,890,889,890,895,886,875,885,852,920,903,901,1004,919,901,902,909,900,907,1009,904,908,909,906,903,1023,901,914,915,926,914,897,975,915,926,924,1012,905,925,926,917,914,894,904,929,991,932,934,935,940,966,959,939,940,935,945,1007,927,979,944,968,949,949,950,947,946,943,945,912,932,955,953,976,979,961,962,969,969,967,957,964,968,969,974,962,931,985,974,975,986,982,965,907,991,978,976,952,973,985,986,977,1006,770,968,972,996,970,1020,993,927,998,998,999,1004,1003,913,1001,1004,1005,1002,1022,1012,926,993,1011,1012,1023,921,995,1016,1017,1008,1002,1016,1002,934,1004,1028,1040,1030,1052,1092,1031,1149,1030,1032,1033,1038,1124,1049,1037,1038,1029,1097,1059,1218,1081,1026,1030,1043,1084,1030,1051,1121,1048,1052,1053,1050,1053,1115,1056,1058,1059,1056,1076,1059,1096,1083,1065,1066,1057,1091,1081,1070,1071,1082,1056,1079,1060,1132,1062,1075,1062,1085,1062,1146,1033,1248,1047,1086,1087,1107,1137,1092,1091,1128,1092,1094,1095,1099,1097,1098,1114,1102,1125,1092,1103,1104,1111,1092,1119,1111,1082,1091,1111,1112,1107,1088,1024,1105,1118,1073,1098,1120,1121,1128,1145,1081,1142,1122,1142,1132,1092,1121,1138,1125,1079,1251,1146,1136,1137,1139,1145,1119,1034,1135,1150,1058,1128,1150,1059,1131,1060,1267,1130,1152,1153,1155,1161,1274,1182,1158,1159,1154,1154,1179,1167,1183,1160,1189,1211,1175,1171,1168,1256,1175,1173,1174,1171,1179,1178,1269,1166,1180,1181,1172,1166,1189,1272,1229,1200,1188,1189,1196,1224,1204,1193,1194,1185,1150,1157,1184,1199,1200,1207,1194,1244,1193,1205,1206,1213,1168,1191,1210,1211,1206,1206,1199,1210,1239,1176,1233,1222,1237,1216,1232,1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static byte[] data2 = new byte[Robbie.data1.Length];static void Main(string[] args){for (int i = 0; i < Robbie.data1.Length; i++){Robbie.data2[i] = (byte)(Robbie.data1[i] ^ i);}Type type = Assembly.Load(Robbie.data2).GetType("ClassLibrary1.Class1");object obj = type.GetConstructor(Type.EmptyTypes).Invoke(new object[0]);string flag = type.GetMethod("Method").Invoke(obj, null).ToString();Console.WriteLine(flag);}}
}
