入门逆向
下载文件 解压后 拖入IDA中
Easy_vb
同样方法 解压后 拖入IDA
Easy_re
下载解压后 打开
似乎有点逗
查下壳先
拖入IDA
选中这两行字符 转译
单击a
得到flag
游戏过关
下载文件 解压
打开 发现要把8个都点亮 每次输入会把输入的数本身和他上一个下一个都改变状态,当所有都变亮,则出现flag
比如输入1后 和输入2后的对比 大于8就会报错
使用IDA打开
ALT+T查找flag
双击查看字符串内存地址 变量位于只读数据区(rdata)
查看伪代码
int sub_45E940()
{
signed int i; // [esp+D0h] [ebp-94h]
char v2; // [esp+DCh] [ebp-88h]
char v3; // [esp+DDh] [ebp-87h]
char v4; // [esp+DEh] [ebp-86h]
char v5; // [esp+DFh] [ebp-85h]
char v6; // [esp+E0h] [ebp-84h]
char v7; // [esp+E1h] [ebp-83h]
char v8; // [esp+E2h] [ebp-82h]
char v9; // [esp+E3h] [ebp-81h]
char v10; // [esp+E4h] [ebp-80h]
char v11; // [esp+E5h] [ebp-7Fh]
char v12; // [esp+E6h] [ebp-7Eh]
char v13; // [esp+E7h] [ebp-7Dh]
char v14; // [esp+E8h] [ebp-7Ch]
char v15; // [esp+E9h] [ebp-7Bh]
char v16; // [esp+EAh] [ebp-7Ah]
char v17; // [esp+EBh] [ebp-79h]
char v18; // [esp+ECh] [ebp-78h]
char v19; // [esp+EDh] [ebp-77h]
char v20; // [esp+EEh] [ebp-76h]
char v21; // [esp+EFh] [ebp-75h]
char v22; // [esp+F0h] [ebp-74h]
char v23; // [esp+F1h] [ebp-73h]
char v24; // [esp+F2h] [ebp-72h]
char v25; // [esp+F3h] [ebp-71h]
char v26; // [esp+F4h] [ebp-70h]
char v27; // [esp+F5h] [ebp-6Fh]
char v28; // [esp+F6h] [ebp-6Eh]
char v29; // [esp+F7h] [ebp-6Dh]
char v30; // [esp+F8h] [ebp-6Ch]
char v31; // [esp+F9h] [ebp-6Bh]
char v32; // [esp+FAh] [ebp-6Ah]
char v33; // [esp+FBh] [ebp-69h]
char v34; // [esp+FCh] [ebp-68h]
char v35; // [esp+FDh] [ebp-67h]
char v36; // [esp+FEh] [ebp-66h]
char v37; // [esp+FFh] [ebp-65h]
char v38; // [esp+100h] [ebp-64h]
char v39; // [esp+101h] [ebp-63h]
char v40; // [esp+102h] [ebp-62h]
char v41; // [esp+103h] [ebp-61h]
char v42; // [esp+104h] [ebp-60h]
char v43; // [esp+105h] [ebp-5Fh]
char v44; // [esp+106h] [ebp-5Eh]
char v45; // [esp+107h] [ebp-5Dh]
char v46; // [esp+108h] [ebp-5Ch]
char v47; // [esp+109h] [ebp-5Bh]
char v48; // [esp+10Ah] [ebp-5Ah]
char v49; // [esp+10Bh] [ebp-59h]
char v50; // [esp+10Ch] [ebp-58h]
char v51; // [esp+10Dh] [ebp-57h]
char v52; // [esp+10Eh] [ebp-56h]
char v53; // [esp+10Fh] [ebp-55h]
char v54; // [esp+110h] [ebp-54h]
char v55; // [esp+111h] [ebp-53h]
char v56; // [esp+112h] [ebp-52h]
char v57; // [esp+113h] [ebp-51h]
char v58; // [esp+114h] [ebp-50h]
char v59; // [esp+120h] [ebp-44h]
char v60; // [esp+121h] [ebp-43h]
char v61; // [esp+122h] [ebp-42h]
char v62; // [esp+123h] [ebp-41h]
char v63; // [esp+124h] [ebp-40h]
char v64; // [esp+125h] [ebp-3Fh]
char v65; // [esp+126h] [ebp-3Eh]
char v66; // [esp+127h] [ebp-3Dh]
char v67; // [esp+128h] [ebp-3Ch]
char v68; // [esp+129h] [ebp-3Bh]
char v69; // [esp+12Ah] [ebp-3Ah]
char v70; // [esp+12Bh] [ebp-39h]
char v71; // [esp+12Ch] [ebp-38h]
char v72; // [esp+12Dh] [ebp-37h]
char v73; // [esp+12Eh] [ebp-36h]
char v74; // [esp+12Fh] [ebp-35h]
char v75; // [esp+130h] [ebp-34h]
char v76; // [esp+131h] [ebp-33h]
char v77; // [esp+132h] [ebp-32h]
char v78; // [esp+133h] [ebp-31h]
char v79; // [esp+134h] [ebp-30h]
char v80; // [esp+135h] [ebp-2Fh]
char v81; // [esp+136h] [ebp-2Eh]
char v82; // [esp+137h] [ebp-2Dh]
char v83; // [esp+138h] [ebp-2Ch]
char v84; // [esp+139h] [ebp-2Bh]
char v85; // [esp+13Ah] [ebp-2Ah]
char v86; // [esp+13Bh] [ebp-29h]
char v87; // [esp+13Ch] [ebp-28h]
char v88; // [esp+13Dh] [ebp-27h]
char v89; // [esp+13Eh] [ebp-26h]
char v90; // [esp+13Fh] [ebp-25h]
char v91; // [esp+140h] [ebp-24h]
char v92; // [esp+141h] [ebp-23h]
char v93; // [esp+142h] [ebp-22h]
char v94; // [esp+143h] [ebp-21h]
char v95; // [esp+144h] [ebp-20h]
char v96; // [esp+145h] [ebp-1Fh]
char v97; // [esp+146h] [ebp-1Eh]
char v98; // [esp+147h] [ebp-1Dh]
char v99; // [esp+148h] [ebp-1Ch]
char v100; // [esp+149h] [ebp-1Bh]
char v101; // [esp+14Ah] [ebp-1Ah]
char v102; // [esp+14Bh] [ebp-19h]
char v103; // [esp+14Ch] [ebp-18h]
char v104; // [esp+14Dh] [ebp-17h]
char v105; // [esp+14Eh] [ebp-16h]
char v106; // [esp+14Fh] [ebp-15h]
char v107; // [esp+150h] [ebp-14h]
char v108; // [esp+151h] [ebp-13h]
char v109; // [esp+152h] [ebp-12h]
char v110; // [esp+153h] [ebp-11h]
char v111; // [esp+154h] [ebp-10h]
char v112; // [esp+155h] [ebp-Fh]
char v113; // [esp+156h] [ebp-Eh]
char v114; // [esp+157h] [ebp-Dh]
char v115; // [esp+158h] [ebp-Ch]
sub_45A7BE("done!!! the flag is ");
v59 = 18;
v60 = 64;
v61 = 98;
v62 = 5;
v63 = 2;
v64 = 4;
v65 = 6;
v66 = 3;
v67 = 6;
v68 = 48;
v69 = 49;
v70 = 65;
v71 = 32;
v72 = 12;
v73 = 48;
v74 = 65;
v75 = 31;
v76 = 78;
v77 = 62;
v78 = 32;
v79 = 49;
v80 = 32;
v81 = 1;
v82 = 57;
v83 = 96;
v84 = 3;
v85 = 21;
v86 = 9;
v87 = 4;
v88 = 62;
v89 = 3;
v90 = 5;
v91 = 4;
v92 = 1;
v93 = 2;
v94 = 3;
v95 = 44;
v96 = 65;
v97 = 78;
v98 = 32;
v99 = 16;
v100 = 97;
v101 = 54;
v102 = 16;
v103 = 44;
v104 = 52;
v105 = 32;
v106 = 64;
v107 = 89;
v108 = 45;
v109 = 32;
v110 = 65;
v111 = 15;
v112 = 34;
v113 = 18;
v114 = 16;
v115 = 0;
v2 = 123;
v3 = 32;
v4 = 18;
v5 = 98;
v6 = 119;
v7 = 108;
v8 = 65;
v9 = 41;
v10 = 124;
v11 = 80;
v12 = 125;
v13 = 38;
v14 = 124;
v15 = 111;
v16 = 74;
v17 = 49;
v18 = 83;
v19 = 108;
v20 = 94;
v21 = 108;
v22 = 84;
v23 = 6;
v24 = 96;
v25 = 83;
v26 = 44;
v27 = 121;
v28 = 104;
v29 = 110;
v30 = 32;
v31 = 95;
v32 = 117;
v33 = 101;
v34 = 99;
v35 = 123;
v36 = 127;
v37 = 119;
v38 = 96;
v39 = 48;
v40 = 107;
v41 = 71;
v42 = 92;
v43 = 29;
v44 = 81;
v45 = 107;
v46 = 90;
v47 = 85;
v48 = 64;
v49 = 12;
v50 = 43;
v51 = 76;
v52 = 86;
v53 = 13;
v54 = 114;
v55 = 1;
v56 = 117;
v57 = 126;
v58 = 0;
for ( i &#61; 0; i <56; &#43;&#43;i ) // flag逻辑
{
*(&v2 &#43; i) ^&#61; *(&v59 &#43; i);
*(&v2 &#43; i) ^&#61; 0x13u;
}
return sub_45A7BE("%s\n");
}
flag生成逻辑 将v2 ~ v58各字符分别与v59 ~ v115进行异或 再与0x13u(十进制19)进行异或 所得的v2~58字符即为flag
由此编写python脚本&#xff1a;
a &#61; [18,64,98,5,2,4,6,3,6,48,49,65,32,12,48,65,31,78,62,32,49,32,
1,57,96,3,21,9,4,62,3,5,4,1,2,3,44,65,78,32,16,97,54,16,44,
52,32,64,89,45,32,65,15,34,18,16,0]
b &#61; [123,32,18,98,119,108,65,41,124,80,125,38,124,111,74,49,
83,108,94,108,84,6,96,83,44,121,104,110,32,95,117,101,99,
123,127,119,96,48,107,71,92,29,81,107,90,85,64,12,43,76,86,
13,114,1,117,126,0]
flag &#61; &#39;&#39;
for i in range(56):
b[i] ^&#61; a[i]
b[i] ^&#61; 19
flag &#43;&#61; chr(b[i])
print(flag)
得到flag
逆向入门
下载后 完成解压
一个exe文件 但是无法正常运行
使用010editor打开
开头为data:image/png;base64 说明这是一个base64文件 拿去解码
拖进QR中 识别二维码
得到flag