cm1 Android reverses
JEB
Directly follow up the main function to find
ASSERT Take it inside ooo file Direct script decryption
k = "vn2022"
with open('ooo', 'rb') as f:
c = f.read()
with open('123', 'wb') as wwww:
for i in range(len(c)):
wwww.write(((c[i] ^ ord(k[i % 1024 % len(k)]))).to_bytes(1, byteorder="little")) # He once read yes 1024!
new dex Decompiling again
A typical xxtea
#include <stdint.h>
#include <stdio.h>
using namespace std;
#define DELTA 0x9E3779B9
#define MX (((z >> 5 ^ y << 2) + (y >> 3 ^ z << 4)) ^ ((sum ^ y) + (key[(p & 3) ^ e] ^ z)))
void xxtea(uint32_t* v, int n, uint32_t* key)
{
uint32_t y, z;
int sum;
unsigned p, rounds, e;
// encrypt
if (n > 1) {
rounds = 6 + (52 / n);
sum = 0;
z = v[n - 1];
do {
sum += DELTA;
e = (sum >> 2) & 3;
for (p = 0; p < n - 1; p++) {
y = v[p + 1];
z = v[p] += MX;
}
y = v[0];
z = v[n - 1] += MX;
} while (--rounds);
}
// decrypt
else if (n < -1) {
n = -n;
rounds = 6 + (52 / n);
sum = rounds * DELTA;
y = v[0];
do {
e = (sum >> 2) & 3;
for (p = n - 1; p > 0; p--) {
z = v[p - 1];
y = v[p] -= MX;
}
z = v[n - 1];
y = v[0] -= MX;
sum -= DELTA;
} while (--rounds);
}
}
int main()
{
int8_t a[] = { 68, 39, -92, 108, -82, -18, 72, -55, 74, -56, 38, 11, 60, 84, 97, -40, 87, 71, 99, -82, 120, 104, 47, -71, -58, -57, 0, 33, 42, 38, -44, -39, -60, 113, -2, 92, -75, 118, -77, 50, -121, 43, 32, -106 };
uint32_t *v=(uint32_t *)a;
// uint32_t v[9] = { 1,1,1,1,1,1,1,1,1 };
// four 32 Bit unsigned integer , namely 128bit Of key
uint32_t *k=(uint32_t *)"H4pPY_VNCTF!!OvO";
// n The absolute value of represents v The length of , Positive means encryption , Take negative to decrypt
int n = 11;
printf("Data is : %x %x %X %x %x %X %x %x %X\n", v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8]);
// xxtea(v, n, k);
// printf("Encrypted data is : %x %x %X %x %x %X %x %x %X\n", v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8]);
xxtea(v, -n, k);
printf("Decrypted data is : %x %x %X %x %x %X %x %x %X\n", v[0], v[1], v[2], v[3], v[4], v[5], v[6], v[7], v[8]);
printf(" The final result is %s", v);
return 0;
}
cmgo! go Language and virtual machine
ida7.6 open go The language is decompiled directly
unk_AFD8A0 yes opcode
main___ptr_MzVm__run Functional ((void (*)(void))(v1 + 8 * v4 + 4104))();
According to opcode Running virtual machines
altogether 20 Orders
Dynamic debugging Found him in groups of three The first number represents the operation instruction Two or three numbers represent registers or operands
To follow up [rbx+rdi*8+1008h] see opcode Mapping relationship with function
turn dq After that, it corresponds to opcode Of 0-16 The corresponding function 1-17
97 98 99 The corresponding function 18 19 20
Look at the opcode And corresponding functions It is found that not all functions are used So we only need to analyze the functions used (code The value is 0, 1, 98, 97, 2, 5, 6, 7, 8, 99, 10, 9, 12, 11, 14)
code0 nop
code 1 mov register Operands
code 2 mov register register
code5 push register 0
code 6 pop
code 7 add register register
code 8 sub
code 9 div
code 10 mul register
code 11 xor
code 12 jmp
code 14 jne Quit differently
code 97scanf
code 98 putchar
code 99 quit
Parsing script
opcode = [[0, 0, 0], [0, 0, 0], [1, 0, 87], [98, 0, 0], [1, 0, 101], [98, 0, 0], [1, 0, 108], [98, 0, 0], [1, 0, 99],
[98, 0, 0], [1, 0, 111], [98, 0, 0], [1, 0, 109], [98, 0, 0], [1, 0, 101], [98, 0, 0], [1, 0, 32], [98, 0, 0],
[1, 0, 116], [98, 0, 0], [1, 0, 111], [98, 0, 0], [1, 0, 32], [98, 0, 0], [1, 0, 86], [98, 0, 0], [1, 0, 78],
[98, 0, 0], [1, 0, 67], [98, 0, 0], [1, 0, 84], [98, 0, 0], [1, 0, 70], [98, 0, 0], [1, 0, 50], [98, 0, 0],
[1, 0, 48], [98, 0, 0], [1, 0, 50], [98, 0, 0], [1, 0, 50], [98, 0, 0], [1, 0, 33], [98, 0, 0], [1, 0, 10],
[98, 0, 0], [1, 0, 105], [98, 0, 0], [1, 0, 110], [98, 0, 0], [1, 0, 112], [98, 0, 0], [1, 0, 117],
[98, 0, 0], [1, 0, 116], [98, 0, 0], [1, 0, 32], [98, 0, 0], [1, 0, 102], [98, 0, 0], [1, 0, 108], [98, 0, 0],
[1, 0, 97], [98, 0, 0], [1, 0, 103], [98, 0, 0], [1, 0, 58], [98, 0, 0], [1, 0, 10], [98, 0, 0], [1, 19, 73],
[1, 3, 0], [1, 1, 43], [1, 2, 1], [97, 0, 0], [5, 0, 0], [8, 1, 2], [14, 1, 3], [1, 0, 0], [5, 0, 0],
[0, 0, 0], [0, 0, 0], [6, 0, 0], [1, 5, 256], [10, 0, 5], [2, 6, 0], [6, 0, 0], [7, 6, 0], [2, 0, 6],
[10, 0, 5], [2, 6, 0], [6, 0, 0], [7, 6, 0], [2, 0, 6], [10, 0, 5], [2, 6, 0], [6, 0, 0], [7, 6, 0],
[0, 0, 0], [6, 0, 0], [1, 5, 256], [10, 0, 5], [2, 7, 0], [6, 0, 0], [7, 7, 0], [2, 0, 7], [10, 0, 5],
[2, 7, 0], [6, 0, 0], [7, 7, 0], [2, 0, 7], [10, 0, 5], [2, 7, 0], [6, 0, 0], [7, 7, 0], [0, 0, 0], [6, 0, 0],
[1, 5, 256], [10, 0, 5], [2, 8, 0], [6, 0, 0], [7, 8, 0], [2, 0, 8], [10, 0, 5], [2, 8, 0], [6, 0, 0],
[7, 8, 0], [2, 0, 8], [10, 0, 5], [2, 8, 0], [6, 0, 0], [7, 8, 0], [0, 0, 0], [6, 0, 0], [1, 5, 256],
[10, 0, 5], [2, 9, 0], [6, 0, 0], [7, 9, 0], [2, 0, 9], [10, 0, 5], [2, 9, 0], [6, 0, 0], [7, 9, 0],
[2, 0, 9], [10, 0, 5], [2, 9, 0], [6, 0, 0], [7, 9, 0], [0, 0, 0], [6, 0, 0], [1, 5, 256], [10, 0, 5],
[2, 10, 0], [6, 0, 0], [7, 10, 0], [2, 0, 10], [10, 0, 5], [2, 10, 0], [6, 0, 0], [7, 10, 0], [2, 0, 10],
[10, 0, 5], [2, 10, 0], [6, 0, 0], [7, 10, 0], [0, 0, 0], [6, 0, 0], [1, 5, 256], [10, 0, 5], [2, 11, 0],
[6, 0, 0], [7, 11, 0], [2, 0, 11], [10, 0, 5], [2, 11, 0], [6, 0, 0], [7, 11, 0], [2, 0, 11], [10, 0, 5],
[2, 11, 0], [6, 0, 0], [7, 11, 0], [0, 0, 0], [6, 0, 0], [1, 5, 256], [10, 0, 5], [2, 12, 0], [6, 0, 0],
[7, 12, 0], [2, 0, 12], [10, 0, 5], [2, 12, 0], [6, 0, 0], [7, 12, 0], [2, 0, 12], [10, 0, 5], [2, 12, 0],
[6, 0, 0], [7, 12, 0], [0, 0, 0], [6, 0, 0], [1, 5, 256], [10, 0, 5], [2, 13, 0], [6, 0, 0], [7, 13, 0],
[2, 0, 13], [10, 0, 5], [2, 13, 0], [6, 0, 0], [7, 13, 0], [2, 0, 13], [10, 0, 5], [2, 13, 0], [6, 0, 0],
[7, 13, 0], [0, 0, 0], [6, 0, 0], [1, 5, 256], [10, 0, 5], [2, 14, 0], [6, 0, 0], [7, 14, 0], [2, 0, 14],
[10, 0, 5], [2, 14, 0], [6, 0, 0], [7, 14, 0], [2, 0, 14], [10, 0, 5], [2, 14, 0], [6, 0, 0], [7, 14, 0],
[0, 0, 0], [6, 0, 0], [1, 5, 256], [10, 0, 5], [2, 15, 0], [6, 0, 0], [7, 15, 0], [2, 0, 15], [10, 0, 5],
[2, 15, 0], [6, 0, 0], [7, 15, 0], [2, 0, 15], [10, 0, 5], [2, 15, 0], [6, 0, 0], [7, 15, 0], [0, 0, 0],
[6, 0, 0], [1, 5, 256], [10, 0, 5], [2, 16, 0], [6, 0, 0], [7, 16, 0], [2, 0, 16], [10, 0, 5], [2, 16, 0],
[6, 0, 0], [7, 16, 0], [2, 0, 16], [10, 0, 5], [2, 16, 0], [6, 0, 0], [7, 16, 0], [0, 0, 0], [5, 6, 0],
[5, 7, 0], [5, 8, 0], [5, 9, 0], [5, 10, 0], [5, 11, 0], [5, 12, 0], [5, 13, 0], [5, 14, 0], [5, 15, 0],
[5, 16, 0], [6, 1, 0], [6, 2, 0], [1, 20, 284], [1, 0, 340], [12, 0, 0], [1, 0, 3906065887], [1, 19, 387],
[1, 20, 339], [14, 1, 0], [1, 0, 4125344020], [14, 2, 0], [6, 1, 0], [6, 2, 0], [1, 20, 295], [1, 0, 340],
[12, 0, 0], [1, 0, 579781142], [1, 19, 387], [1, 20, 339], [14, 1, 0], [1, 0, 2312395361], [14, 2, 0],
[6, 1, 0], [6, 2, 0], [1, 20, 306], [1, 0, 340], [12, 0, 0], [1, 0, 1700499305], [1, 19, 387], [1, 20, 339],
[14, 1, 0], [1, 0, 612671610], [14, 2, 0], [6, 1, 0], [6, 2, 0], [1, 20, 317], [1, 0, 340], [12, 0, 0],
[1, 0, 3655723000], [1, 19, 387], [1, 20, 339], [14, 1, 0], [1, 0, 977540402], [14, 2, 0], [6, 1, 0],
[6, 2, 0], [1, 20, 328], [1, 0, 340], [12, 0, 0], [1, 0, 2443935368], [1, 19, 387], [1, 20, 339], [14, 1, 0],
[1, 0, 1778148540], [14, 2, 0], [6, 1, 0], [1, 0, 8206181], [14, 1, 0], [1, 0, 393], [12, 0, 0], [99, 0, 0],
[1, 3, 2654435769], [1, 4, 613452], [1, 5, 34589], [1, 6, 108471], [1, 7, 1230791], [1, 8, 0], [1, 17, 16],
[1, 18, 32], [1, 19, 352], [1, 10, 0], [1, 11, 32], [1, 12, 1], [7, 8, 3], [2, 0, 2], [10, 0, 17], [7, 0, 4],
[2, 14, 0], [2, 0, 2], [7, 0, 8], [2, 15, 0], [2, 0, 2], [9, 0, 18], [7, 0, 5], [2, 16, 0], [2, 0, 14],
[11, 0, 15], [11, 0, 16], [7, 1, 0], [2, 0, 1], [10, 0, 17], [7, 0, 6], [2, 14, 0], [2, 0, 1], [7, 0, 8],
[2, 15, 0], [2, 0, 1], [9, 0, 18], [7, 0, 7], [2, 16, 0], [2, 0, 14], [11, 0, 15], [11, 0, 16], [7, 2, 0],
[8, 11, 12], [14, 11, 10], [12, 20, 0], [0, 0, 0], [1, 0, 110], [98, 0, 0], [1, 0, 111], [98, 0, 0],
[12, 20, 0], [0, 0, 0], [1, 0, 121], [98, 0, 0], [1, 0, 101], [98, 0, 0], [1, 0, 115], [98, 0, 0],
[12, 20, 0], [0, 0, 0], [0, 0, 0], [0, 0, 0], [0, 0, 0], [0, 0, 0]]
for x in opcode:
if x[0] == 0:
# print("nop")
pass
elif x[0] == 1:
print(f"mov r{x[1]} {hex(x[2]).upper()}")
elif x[0] == 2:
print(f"mov r{x[1]} r{x[2]}")
elif x[0] == 5:
print(f"push r{x[1]}")
elif x[0] == 6:
print(f"pop r{x[1]}")
elif x[0] == 7:
print(f"add r{x[1]} r{x[2]}")
elif x[0] == 8:
print(f"sub r{x[1]} r{x[2]}")
elif x[0] == 9:
print(f"div r{x[1]} r{x[2]}")
elif x[0] == 10:
print(f"mul r{x[1]} r{x[2]}")
elif x[0] == 11:
print(f"xor r{x[1]} r{x[2]}")
elif x[0] == 12:
print(f"jmp r{x[1]}")
elif x[0] == 14:
print(f"if r{x[1]}!=r{x[2]}:quit")
elif x[0] == 97:
print(f"scanf r{x[1]} ")
elif x[0] == 98:
print(f"putchar r{x[1]} ")
elif x[0] == 99:
print(f"quit ")
mov r0 0X57
putchar r0
mov r0 0X65
putchar r0
mov r0 0X6C
putchar r0
mov r0 0X63
putchar r0
mov r0 0X6F
putchar r0
mov r0 0X6D
putchar r0
mov r0 0X65
putchar r0
mov r0 0X20
putchar r0
mov r0 0X74
putchar r0
mov r0 0X6F
putchar r0
mov r0 0X20
putchar r0
mov r0 0X56
putchar r0
mov r0 0X4E
putchar r0
mov r0 0X43
putchar r0
mov r0 0X54
putchar r0
mov r0 0X46
putchar r0
mov r0 0X32
putchar r0
mov r0 0X30
putchar r0
mov r0 0X32
putchar r0
mov r0 0X32
putchar r0
mov r0 0X21
putchar r0
mov r0 0XA
putchar r0
mov r0 0X69
putchar r0
mov r0 0X6E
putchar r0
mov r0 0X70
putchar r0
mov r0 0X75
putchar r0
mov r0 0X74
putchar r0
mov r0 0X20
putchar r0
mov r0 0X66
putchar r0
mov r0 0X6C
putchar r0
mov r0 0X61
putchar r0
mov r0 0X67
putchar r0
mov r0 0X3A
putchar r0
mov r0 0XA
putchar r0
# The above are all tips No dice
mov r19 0X49
mov r3 0X0
mov r1 0X2B
mov r2 0X1
scanf r0
push r0
sub r1 r2
if r1!=r3:quit
mov r0 0X0
push r0
pop r0
mov r5 0X100 # These two lines are equivalent to >>8 somewhat tea
mul r0 r5
mov r6 r0
pop r0
add r6 r0
mov r0 r6
mul r0 r5
mov r6 r0
pop r0
add r6 r0
mov r0 r6
mul r0 r5
mov r6 r0
pop r0
add r6 r0
pop r0
mov r5 0X100
mul r0 r5
mov r7 r0
pop r0
add r7 r0
mov r0 r7
mul r0 r5
mov r7 r0
pop r0
add r7 r0
mov r0 r7
mul r0 r5
mov r7 r0
pop r0
add r7 r0
pop r0
mov r5 0X100
mul r0 r5
mov r8 r0
pop r0
add r8 r0
mov r0 r8
mul r0 r5
mov r8 r0
pop r0
add r8 r0
mov r0 r8
mul r0 r5
mov r8 r0
pop r0
add r8 r0
pop r0
mov r5 0X100
mul r0 r5
mov r9 r0
pop r0
add r9 r0
mov r0 r9
mul r0 r5
mov r9 r0
pop r0
add r9 r0
mov r0 r9
mul r0 r5
mov r9 r0
pop r0
add r9 r0
pop r0
mov r5 0X100
mul r0 r5
mov r10 r0
pop r0
add r10 r0
mov r0 r10
mul r0 r5
mov r10 r0
pop r0
add r10 r0
mov r0 r10
mul r0 r5
mov r10 r0
pop r0
add r10 r0
pop r0
mov r5 0X100
mul r0 r5
mov r11 r0
pop r0
add r11 r0
mov r0 r11
mul r0 r5
mov r11 r0
pop r0
add r11 r0
mov r0 r11
mul r0 r5
mov r11 r0
pop r0
add r11 r0
pop r0
mov r5 0X100
mul r0 r5
mov r12 r0
pop r0
add r12 r0
mov r0 r12
mul r0 r5
mov r12 r0
pop r0
add r12 r0
mov r0 r12
mul r0 r5
mov r12 r0
pop r0
add r12 r0
pop r0
mov r5 0X100
mul r0 r5
mov r13 r0
pop r0
add r13 r0
mov r0 r13
mul r0 r5
mov r13 r0
pop r0
add r13 r0
mov r0 r13
mul r0 r5
mov r13 r0
pop r0
add r13 r0
pop r0
mov r5 0X100
mul r0 r5
mov r14 r0
pop r0
add r14 r0
mov r0 r14
mul r0 r5
mov r14 r0
pop r0
add r14 r0
mov r0 r14
mul r0 r5
mov r14 r0
pop r0
add r14 r0
pop r0
mov r5 0X100
mul r0 r5
mov r15 r0
pop r0
add r15 r0
mov r0 r15
mul r0 r5
mov r15 r0
pop r0
add r15 r0
mov r0 r15
mul r0 r5
mov r15 r0
pop r0
add r15 r0
pop r0
mov r5 0X100
mul r0 r5
mov r16 r0
pop r0
add r16 r0
mov r0 r16
mul r0 r5
mov r16 r0
pop r0
add r16 r0
mov r0 r16
mul r0 r5
mov r16 r0
pop r0
add r16 r0
push r6
push r7
push r8
push r9
push r10
push r11
push r12
push r13
push r14
push r15
push r16
pop r1
pop r2
mov r20 0X11C
mov r0 0X154
jmp r0
mov r0 0XE8D1D5DF
mov r19 0X183
mov r20 0X153
if r1!=r0:quit
mov r0 0XF5E3C114
if r2!=r0:quit
pop r1
pop r2
mov r20 0X127
mov r0 0X154
jmp r0
mov r0 0X228EC216
mov r19 0X183
mov r20 0X153
if r1!=r0:quit
mov r0 0X89D45A61
if r2!=r0:quit
pop r1
pop r2
mov r20 0X132
mov r0 0X154
jmp r0
mov r0 0X655B8F69
mov r19 0X183
mov r20 0X153
if r1!=r0:quit
mov r0 0X2484A07A
if r2!=r0:quit
pop r1
pop r2
mov r20 0X13D
mov r0 0X154
jmp r0
mov r0 0XD9E5E7F8
mov r19 0X183
mov r20 0X153
if r1!=r0:quit
mov r0 0X3A441532
if r2!=r0:quit
pop r1
pop r2
mov r20 0X148
mov r0 0X154
jmp r0
mov r0 0X91AB7E88
mov r19 0X183
mov r20 0X153
if r1!=r0:quit
mov r0 0X69FC64BC
if r2!=r0:quit
pop r1
mov r0 0X7D3765
if r1!=r0:quit
mov r0 0X189
jmp r0
quit
mov r3 0X9E3779B9 #delta Sure is tea
mov r4 0X95C4C #k0 To k3
mov r5 0X871D
mov r6 0X1A7B7
mov r7 0X12C7C7
mov r8 0X0 #sum
mov r17 0X10
mov r18 0X20
mov r19 0X160
mov r10 0X0
mov r11 0X20
mov r12 0X1
add r8 r3
mov r0 r2
mul r0 r17
add r0 r4
mov r14 r0
mov r0 r2
add r0 r8
mov r15 r0
mov r0 r2
div r0 r18
add r0 r5
mov r16 r0
mov r0 r14
xor r0 r15
xor r0 r16
add r1 r0
mov r0 r1
mul r0 r17
add r0 r6
mov r14 r0
mov r0 r1
add r0 r8
mov r15 r0
mov r0 r1
div r0 r18
add r0 r7
mov r16 r0
mov r0 r14
xor r0 r15
xor r0 r16
add r2 r0
sub r11 r12
if r11!=r10:quit
jmp r20
mov r0 0X6E
putchar r0
mov r0 0X6F
putchar r0
jmp r20
mov r0 0X79
putchar r0
mov r0 0X65
putchar r0
mov r0 0X73
putchar r0
jmp r20
It can be downloaded from 0x9e3779b9 It should be a tea Class function Less bit operation should be a standard tea
All of the above mul and div They are all used for the corresponding bit operation
Problem solving script
The correct result can be obtained according to the comparison function ( altogether 11 individual however tea Only encrypted 10 individual ) then tea The script can be decrypted
#include <iostream>
#include <stdio.h>
#include <string>
using namespace std;
int TEA_decode(uint32_t* v, uint32_t* key)
{
uint32_t j;
uint32_t delta = 0x9e3779b9;
uint32_t sum = 0xC6EF3720;
uint32_t v0 = v[0], v1 = v[1];
uint32_t key0 = key[0], key1 = key[1], key2 = key[2], key3 = key[3];
for (j = 0; j < 32; j++) {
v1 -= ((v0 << 4) + key2) ^ (v0 + sum) ^ ((v0 >> 5) + key3);
v0 -= ((v1 << 4) + key0) ^ (v1 + sum) ^ ((v1 >> 5) + key1);
sum -= delta;
}
v[0] = v0;
v[1] = v1;
}
int main()
{
uint32_t k[4] = { 0X95C4C, 0X871D, 0X1A7B7, 0X12C7C7 };
uint32_t enc[11] = { 0XE8D1D5DF, 0XF5E3C114, 0X228EC216, 0X89D45A61, 0X655B8F69, 0X2484A07A, 0XD9E5E7F8, 0X3A441532, 0X91AB7E88, 0X69FC64BC, 0X7D3765 };
// TEA_encrypt(enc2,k);
uint32_t t1[3] = { 0XE8D1D5DF, 0XF5E3C114, 0 };
uint32_t t2[3] = { 0X228EC216, 0X89D45A61, 0 };
uint32_t t3[3] = { 0X655B8F69, 0X2484A07A, 0 };
uint32_t t4[3] = { 0XD9E5E7F8, 0X3A441532, 0 };
uint32_t t5[3] = { 0X91AB7E88, 0X69FC64BC, 0 };
uint32_t t6[2] = { 0X7D3765, 0 };
TEA_decode(t1, k);
TEA_decode(t2, k);
TEA_decode(t3, k);
TEA_decode(t4, k);
TEA_decode(t5, k);
// TEA_decode(t6, k);
printf("%s%s%s%s%s%s", t1, t2, t3, t4, t5, t6);
return 0;
}
VNCTF{ecd63ae5-8945-4ac4-b5a5-34fc3ade81e7}
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