-
Notifications
You must be signed in to change notification settings - Fork 1
/
x86-obfuscator.py
593 lines (589 loc) · 24 KB
/
x86-obfuscator.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
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
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
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
592
593
from iced_x86 import *
import random
from random import randint
class X64ObfuscatorLib:
def __init__(self,code,start_address,base):
self.code = code
self.bitness = 64
self.start_address = start_address
self.formatter = Formatter(FormatterSyntax.NASM)
self.base = base
self.bbs_with_links = {}
def load(self):
bbs = []
bb = []
visited = []
print('[*] start recursive disassembly..')
targets = [Decoder(self.bitness, self.code, ip=self.start_address)]
is_control_flow_end = False
while len(targets) > 0:
target = targets.pop()
if target.ip in visited:
continue
visited.append(target.ip)
#try:
for insn in target:
is_control_flow_end = False
bb.append(insn)
if insn.is_loop or \
insn.is_loopcc or \
insn.is_call_near or \
insn.is_jcc_short_or_near or \
insn.is_jkcc_short_or_near:
#print(f"{insn.ip:016X} {insn}")
is_control_flow_end = True
bbs.append(bb)
bb = []
insn.as_near_branch()
idx = insn.near_branch_target - self.base
idx_next = insn.next_ip - self.base
targets.append(Decoder(self.bitness, self.code[idx:], ip=insn.near_branch_target))
targets.append(Decoder(self.bitness, self.code[idx_next:], ip=insn.next_ip))
break
elif insn.mnemonic == Mnemonic.RET or \
insn.mnemonic == Mnemonic.RETF or \
insn.mnemonic == Mnemonic.HLT or \
insn.mnemonic == Mnemonic.SYSCALL or \
insn.mnemonic == Mnemonic.INT:
is_control_flow_end = True
bbs.append(bb)
bb = []
break
elif insn.is_jmp_short_or_near:
is_control_flow_end = True
bbs.append(bb)
bb = []
insn.as_near_branch()
idx = insn.near_branch_target - self.base
targets.append(Decoder(self.bitness, self.code[idx:], ip=insn.near_branch_target))
break
elif insn.is_jmp_far or insn.is_call_far or \
insn.is_jmp_near_indirect or insn.is_call_near_indirect or \
insn.is_jmp_far_indirect or insn.is_call_far_indirect:
is_control_flow_end = True
bbs.append(bb)
bb = []
break
if not is_control_flow_end:
bbs.append(bb)
bb = []
#except:
# continue
print("[*] creating basicblocks")
for bb in bbs:
insn_end = bb[-1]
insn_start = bb[0]
idx_bb = insn_start.ip - self.base
if insn_end.is_jcc_short_or_near or \
insn_end.is_jkcc_short_or_near or \
insn_end.is_call_near or \
insn_end.is_loop or \
insn_end.is_loopcc:
idx_to_bb = {'jmp':insn.near_branch_target,'seq':insn.next_ip}
elif insn_end.is_jmp_short_or_near:
idx_to_bb = {'jmp':insn.near_branch_target,'seq':None}
elif insn.is_jmp_far or insn.is_call_far or \
insn.is_jmp_near_indirect or insn.is_call_near_indirect or \
insn.is_jmp_far_indirect or insn.is_call_far_indirect or \
insn.mnemonic == Mnemonic.HLT or \
insn.mnemonic == Mnemonic.SYSCALL or \
insn.mnemonic == Mnemonic.RET or \
insn.mnemonic == Mnemonic.INT or \
insn.mnemonic == Mnemonic.RETF:
idx_to_bb = {'jmp':None,'seq':None}
else:
idx_to_bb = {'jmp':None,'seq':insn_end.next_ip}
self.bbs_with_links[idx_bb] = {'bb':bb, 'idx_to_bb':idx_to_bb}
self.remove_reps()
def remove_rep_bbs(self,idx1,idx2):
bb1 = self.bbs_with_links[idx1]
bb2 = self.bbs_with_links[idx2]
for i in range(len(bb1['bb'])):
for j in range(len(bb2['bb'])):
if bb1['bb'][i].ip == bb2['bb'][j].ip:
self.bbs_with_links.pop(idx2)
return True
return False
def remove_reps(self):
idxs = sorted(list(self.bbs_with_links.keys()))
bbs = []
for idx1 in idxs:
for idx2 in idxs:
if idx1 == idx2:
continue
if self.remove_rep_bbs(idx1,idx2):
i = idxs.index(idx2)
idxs.pop(i)
def print_bbs(self):
idxs = sorted(list(self.bbs_with_links.keys()))
for idx in idxs:
bb = self.bbs_with_links[idx]
print("BasicBlock %lx" % idx)
for insn in bb['bb']:
if insn.mnemonic == Mnemonic.DB:
continue
disasm = self.formatter.format(insn)
print(f"{insn.ip:016X} {disasm}")
def build_bbs(self):
idxs = sorted(list(self.bbs_with_links.keys()))
mc = b''
for idx in idxs:
bb = self.bbs_with_links[idx]['bb']
eb = BlockEncoder(64)
eb.add_many(bb)
mc += eb.encode(self.base)
return mc
def gen_reg64(self):
regs64 = [
Register.RAX,
Register.RDX,
Register.RBX,
Register.RBP,
Register.RSI,
Register.RDI,
Register.R8,
Register.R9,
Register.R10,
Register.R11,
Register.R12,
Register.R13,
Register.R14,
Register.R15
]
random.shuffle(regs64)
return regs64[-1]
def gen_reg32(self):
regs32 = [
Register.EAX,
Register.EDX,
Register.EBX,
Register.EBP,
Register.ESI,
Register.EDI,
Register.R8D,
Register.R9D,
Register.R10D,
Register.R11D,
Register.R12D,
Register.R13D,
Register.R14D,
Register.R15D
]
random.shuffle(regs32)
return regs32[-1]
def gen_reg16(self):
regs16 = [
Register.AX,
Register.DX,
Register.BX,
Register.BP,
Register.SI,
Register.DI,
Register.R8W,
Register.R9W,
Register.R10W,
Register.R11W,
Register.R12W,
Register.R13W,
Register.R14W,
Register.R15W
]
random.shuffle(regs16)
return regs16[-1]
def gen_reg8(self):
regs8 = [
Register.AL,
Register.DL,
Register.BL,
Register.BPL,
Register.DIL,
Register.SIL,
Register.R8L,
Register.R9L,
Register.R10L,
Register.R11L,
Register.R12L,
Register.R13L,
Register.R14L,
Register.R15L,
]
random.shuffle(regs8)
return regs8[-1]
#def gen_junk_0(self,start_ea):
#def gen_junk_1(self,start_ea):
#def gen_junk_2(self,start_ea):
#def gen_junk_3(self,start_ea):
def gen_junk_4(self,start_ea):
insns = []
reg1,reg2,reg3,reg4 = self.gen_reg64(),self.gen_reg64(),self.gen_reg64(),self.gen_reg64()
while True:
if reg1 == reg2:
reg1 = self.gen_reg64()
else:
break
while True:
if reg2 == reg3:
reg2 = self.gen_reg64()
else:
break
while True:
if reg3 == reg4:
reg3 = self.gen_reg64()
else:
break
while True:
if reg4 == reg2:
reg4 = self.gen_reg64()
else:
break
while True:
if reg1 == reg4:
reg1 = self.gen_reg64()
else:
break
init_insns = [
Instruction.create_reg(Code.PUSH_R64,reg1),
Instruction.create_reg(Code.PUSH_R64,reg2),
Instruction.create_reg(Code.PUSH_R64,reg3),
Instruction.create_reg(Code.PUSH_R64,reg4),
]
random.shuffle(init_insns)
init_insns[0].ip = start_ea
insns.extend(init_insns)
body = [
Instruction.create_reg_i32(Code.ADD_RM64_IMM32,reg1,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.ADD_RM64_IMM32,reg2,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.ADD_RM64_IMM32,reg3,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.ADD_RM64_IMM32,reg4,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.SUB_RM64_IMM32,reg1,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.SUB_RM64_IMM32,reg2,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.SUB_RM64_IMM32,reg3,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.SUB_RM64_IMM32,reg4,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.OR_RM64_IMM32,reg1,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.OR_RM64_IMM32,reg2,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.OR_RM64_IMM32,reg3,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.OR_RM64_IMM32,reg4,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.AND_RM64_IMM32,reg1,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.AND_RM64_IMM32,reg2,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.AND_RM64_IMM32,reg3,randint(0,0x00ffffff)),
Instruction.create_reg_i32(Code.AND_RM64_IMM32,reg4,randint(0,0x00ffffff)),
]
random.shuffle(body)
insns.extend(body)
fini_insns = [
Instruction.create_reg(Code.POP_R64,init_insns[3].op0_register),
Instruction.create_reg(Code.POP_R64,init_insns[2].op0_register),
Instruction.create_reg(Code.POP_R64,init_insns[1].op0_register),
Instruction.create_reg(Code.POP_R64,init_insns[0].op0_register),
]
insns.extend(fini_insns)
ip = start_ea
for i in range(len(insns)):
insns[i].ip = ip
e = Encoder(64)
ip+=e.encode(insns[i],ip)
return insns
def gen_junk_5(self,start_ea):
insns = []
reg1,reg2,reg3 = self.gen_reg64(),self.gen_reg64(),self.gen_reg64()
while True:
if reg1 == reg2:
reg1 = self.gen_reg64()
else:
break
while True:
if reg2 == reg3:
reg2 = self.gen_reg64()
else:
break
while True:
if reg1 == reg3:
reg1 = self.gen_reg64()
else:
break
init_insns = [
Instruction.create_reg(Code.PUSH_R64,reg1),
Instruction.create_reg(Code.PUSH_R64,reg2),
Instruction.create_reg(Code.PUSH_R64,reg3),
]
random.shuffle(init_insns)
init_insns[0].ip = start_ea
insns.extend(init_insns)
body = [
Instruction.create_reg_reg(Code.XCHG_RM64_R64,reg1,reg2),
Instruction.create_reg_reg(Code.XADD_RM64_R64,reg1,reg3),
Instruction.create_reg_i32(Code.ROL_RM64_IMM8,reg3,randint(0,255)),
Instruction.create_reg_reg(Code.XCHG_RM64_R64,reg3,reg2),
Instruction.create_reg_i32(Code.ROR_RM64_IMM8,reg2,randint(0,255)),
Instruction.create_reg_i32(Code.ROR_RM64_IMM8,reg1,randint(0,255)),
Instruction.create_reg_i32(Code.ROL_RM64_IMM8,reg1,randint(0,255)),
Instruction.create_reg_reg(Code.XADD_RM64_R64,reg2,reg1),
Instruction.create_reg_reg(Code.XADD_RM64_R64,reg3,reg3),
Instruction.create_reg(Code.BSWAP_R64,reg2),
Instruction.create_reg(Code.BSWAP_R64,reg1),
Instruction.create_reg_i32(Code.XOR_RM64_IMM32,reg3,randint(0x0,0x00ffffff)),
Instruction.create_reg(Code.BSWAP_R64,reg3),
Instruction.create_reg_i32(Code.XOR_RM64_IMM32,reg2,randint(0x0,0x00ffffff)),
Instruction.create_reg_i32(Code.XOR_RM64_IMM32,reg1,randint(0x0,0x00ffffff)),
]
random.shuffle(body)
insns.extend(body)
fini_insns = [
Instruction.create_reg(Code.POP_R64,init_insns[2].op0_register),
Instruction.create_reg(Code.POP_R64,init_insns[1].op0_register),
Instruction.create_reg(Code.POP_R64,init_insns[0].op0_register),
]
insns.extend(fini_insns)
ip = start_ea
for i in range(len(insns)):
insns[i].ip = ip
e = Encoder(64)
ip+=e.encode(insns[i],ip)
return insns
def gen_junk(self,count,start_ea):
insns = []
ip = start_ea
for i in range(count):
types = random.randint(4,5)
#if types == 0:
# insns.extend(self.gen_junk_0(start_ea))
#elif types == 1:
# insns.extend(self.gen_junk_1(start_ea))
#elif types == 2:
# insns.extend(self.gen_junk_2(start_ea))
#elif types == 3:
# insns.extend(self.gen_junk_3(start_ea))
if types == 4:
insns.extend(self.gen_junk_4(start_ea))
elif types == 5:
insns.extend(self.gen_junk_5(start_ea))
return insns
def gen_junk_bb(self, bb):
inserts = random.randint(1,len(bb))
for insert in range(inserts):
point = random.randint(0,len(bb)-1)
count_insns = random.randint(3,20)
ip = bb[0].ip
for i in self.gen_junk(count_insns,bb[point].ip):
i.ip = ip
e = Encoder(64)
next_ip = e.encode(i,ip)
ip+=next_ip
bb.insert(point,i)
point+=1
return bb
def correct_ips(self,bb):
ip = bb[0].ip
for i in range(len(bb)):
bb[i].ip = ip
e = Encoder(64)
try:
ip+=e.encode(bb[i],ip)
except:
print('[*] warning cannot handle insn')
print(hex(bb[i].ip),bb[i])
return bb
def get_next_ip(self,insn,ip):
e = Encoder(64)
return e.encode(insn,ip)
def inject_smc(self,bb):
smc_insns = []
rol = lambda val, r_bits, max_bits: \
(val << r_bits%max_bits) & (2**max_bits-1) | \
((val & (2**max_bits-1)) >> (max_bits-(r_bits%max_bits)))
# Rotate right: 0b1001 --> 0b1100
ror = lambda val, r_bits, max_bits: \
((val & (2**max_bits-1)) >> r_bits%max_bits) | \
(val << (max_bits-(r_bits%max_bits)) & (2**max_bits-1))
eb = BlockEncoder(64)
eb.add_many(bb)
mc = list(eb.encode(bb[0].ip))
ops_count = randint(20,140)
ops = []
key = randint(0x10,127)
for i in range(ops_count):
op = randint(0,3)
if op == 0: # xor
for i in range(len(mc)):
mc[i] ^= key
ops.append({'op':'xor'})
elif op == 1: # not
for i in range(len(mc)):
mc[i] ^= 0xff
ops.append({'op':'not'})
elif op == 2: # ror
skey = randint(1,127)
key = ror(key,skey,8)
ops.append({'op':'ror','skey':skey})
elif op == 3: # rol
skey = randint(1,127)
key = rol(key,skey,8)
ops.append({'op':'rol','skey':skey})
reg_key = self.gen_reg8()
reg_smc_ea = self.gen_reg64()
while True:
if reg_key == Register.AL:
reg_key64 = Register.RAX
elif reg_key == Register.BL:
reg_key64 = Register.RBX
elif reg_key == Register.CL:
reg_key64 = Register.RCX
elif reg_key == Register.DL:
reg_key64 = Register.RDX
elif reg_key == Register.DIL:
reg_key64 = Register.RDI
elif reg_key == Register.SIL:
reg_key64 = Register.RSI
elif reg_key == Register.BPL:
reg_key64 = Register.RBP
elif reg_key == Register.R8L:
reg_key64 = Register.R8
elif reg_key == Register.R9L:
reg_key64 = Register.R9
elif reg_key == Register.R10L:
reg_key64 = Register.R10
elif reg_key == Register.R11L:
reg_key64 = Register.R11
elif reg_key == Register.R12L:
reg_key64 = Register.R12
elif reg_key == Register.R13L:
reg_key64 = Register.R13
elif reg_key == Register.R14L:
reg_key64 = Register.R14
elif reg_key == Register.R15L:
reg_key64 = Register.R15
if reg_smc_ea == reg_key64:
reg_smc_ea = self.gen_reg64()
reg_key = self.gen_reg8()
else:
break
ip = bb[0].ip
smc_insns.append(Instruction.create_reg(Code.DEC_RM64,Register.RSP))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_mem_reg(Code.MOV_RM8_R8,MemoryOperand(base=Register.RSP),reg_key))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg_u64(Code.MOV_R8_IMM8,reg_key,key))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg(Code.PUSH_R64,reg_smc_ea))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg_mem(Code.LEA_R64_M,reg_smc_ea,MemoryOperand(Register.RIP,displ=1)))
smc_insns[-1].ip = ip
lea_idx = len(smc_insns)-1
ip += self.get_next_ip(smc_insns[-1],ip)
while len(ops) > 0:
op = ops.pop()
if op['op'] == 'xor':
smc_insns.append(Instruction.create_reg(Code.PUSH_R64,Register.RCX))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg_u64(Code.MOV_R64_IMM64,Register.RCX,len(mc)-1))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_mem_reg(Code.XOR_RM8_R8,MemoryOperand(base=reg_smc_ea,index=Register.RCX),reg_key))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
#print(f'{hex(smc_insns[curr_i].ip)}: {smc_insns[curr_i]}')
smc_insns.append(Instruction.create_branch(Code.LOOP_REL8_64_RCX,ip))
smc_insns[-1].ip = ip
smc_insns[-1].near_branch64 = smc_insns[-2].ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_mem_u32(Code.XOR_RM8_IMM8, MemoryOperand(base=reg_smc_ea,index=Register.RCX),0xff))
smc_insns[-1].ip = ip
#print(f'{hex(smc_insns[curr_i].ip)}: {smc_insns[curr_i]}')
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg(Code.POP_R64,Register.RCX))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
elif op['op'] == 'not':
smc_insns.append(Instruction.create_reg(Code.PUSH_R64,Register.RCX))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg_u64(Code.MOV_R64_IMM64,Register.RCX,len(mc)-1))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_mem_u32(Code.XOR_RM8_IMM8, MemoryOperand(base=reg_smc_ea,index=Register.RCX),0xff))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
#print(f'{hex(smc_insns[curr_i].ip)}: {smc_insns[curr_i]}')
smc_insns.append(Instruction.create_branch(Code.LOOP_REL8_64_RCX,ip))
smc_insns[-1].ip = ip
smc_insns[-1].near_branch64 = smc_insns[-2].ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_mem_u32(Code.XOR_RM8_IMM8, MemoryOperand(base=reg_smc_ea,index=Register.RCX),0xff))
smc_insns[-1].ip = ip
#print(f'{hex(smc_insns[curr_i].ip)}: {smc_insns[curr_i]}')
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg(Code.POP_R64,Register.RCX))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
elif op['op'] == 'ror':
smc_insns.append(Instruction.create_reg_u32(Code.ROL_RM8_IMM8,reg_key,op['skey']))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
elif op['op'] == 'rol':
smc_insns.append(Instruction.create_reg_u32(Code.ROR_RM8_IMM8,reg_key,op['skey']))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg(Code.POP_R64,reg_smc_ea))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg_mem(Code.MOV_R8_RM8,reg_key,MemoryOperand(base=Register.RSP)))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
smc_insns.append(Instruction.create_reg(Code.INC_RM64,Register.RSP))
smc_insns[-1].ip = ip
ip += self.get_next_ip(smc_insns[-1],ip)
dbs = [Instruction.create_declare_byte_1(db) for db in mc]
dbs[0].ip = ip
smc_insns[lea_idx].memory_displacement = ip
smc_insns.extend(dbs)
return smc_insns
def obfuscate_bbs(self):
idxs = sorted(list(self.bbs_with_links.keys()))
for idx in idxs:
bb = self.bbs_with_links[idx]['bb']
junked_bb = self.correct_ips(self.gen_junk_bb(bb))
smc_bb = self.inject_smc(junked_bb)
self.bbs_with_links[idx]['bb'] = smc_bb
for idx in idxs:
bb = self.bbs_with_links[idx]['bb']
ip = bb[0].ip
for i in range(len(bb)):
bb[i].ip = ip
e = Encoder(64)
ip+=e.encode(bb[i],ip)
self.bbs_with_links[idx]['bb'] = bb
def obfuscator_bin(code,base,start_analysis_ea):
o = X64ObfuscatorLib(code, start_analysis_ea, base)
o.load()
print("[*] obfuscating bbs")
o.obfuscate_bbs()
#o.print_bbs()
print('[*] rebuild bbs with splitting')
encoded = o.build_bbs()
print('[+] complete!')
return encoded
#def pe_obfuscator(file_in,file_out):
# import lief
# file = lief.parse(file_in)
# text_sec = file.get_section('.text')
# text_sec_b = text_sec.content.tobytes()
# base = text_sec.virtual_address + file.imagebase
# entrypoint = file.entrypoint
# idx = entrypoint - base
# print('[*] obfuscating entrypoint')
# obf_text = obfuscator_bin(text_sec_b,base,entrypoint)
# file.patch_address(base,list(obf_text))
# print('[*] saving binary to:',file_out)
# file.write(file_out)
if __name__ == '__main__':
#code = b"\x55\x48\x89\xE5\x48\x01\xD8\x48\x89\xE5\x5D\xC3"
#code = b"\x48\x31\xC0\x48\x31\xDB\x48\x31\xC9\x48\x31\xD2\x50\x68\x6E\x2F\x73\x68\x68\x2F\x2F\x62\x69\x48\x89\xEB\xB0\x0B\xCD\x80"
code = b"\x48\xC7\xC0\x3C\x00\x00\x00\x30\xDB\x0F\x05"
open('obf.bin','wb').write(obfuscator_bin(code,0,0))
#from sys import argv
#pe_obfuscator(argv[1],argv[2])