-
Notifications
You must be signed in to change notification settings - Fork 92
Expand file tree
/
Copy pathheaders.py
More file actions
580 lines (468 loc) · 24 KB
/
Copy pathheaders.py
File metadata and controls
580 lines (468 loc) · 24 KB
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
import os
import struct
from contextlib import contextmanager
from ctypes import *
from datetime import datetime
from colorama import Fore
from unicorn import UcError
from unipacker.pe_structs import (_IMAGE_DATA_DIRECTORY, _IMAGE_DOS_HEADER,
_IMAGE_FILE_HEADER, _IMAGE_OPTIONAL_HEADER,
IMAGE_IMPORT_DESCRIPTOR,
IMAGE_SECTION_HEADER, DataDirectory,
DosHeader, ImportDescriptor, OptionalHeader,
PEHeader, SectionHeader)
from unipacker.utils import ImportValues, InvalidPEFile, get_string
header_sizes = {
"_IMAGE_DOS_HEADER": len(bytes(_IMAGE_DOS_HEADER())), # 0x40
"_IMAGE_FILE_HEADER": len(bytes(_IMAGE_FILE_HEADER())), # 0x18
"_IMAGE_OPTIONAL_HEADER": len(bytes(_IMAGE_OPTIONAL_HEADER())), # 0xE0
"IMAGE_SECTION_HEADER": len(bytes(IMAGE_SECTION_HEADER())), # 0x28
"_IMAGE_DATA_DIRECTORY": len(bytes(_IMAGE_DATA_DIRECTORY())), # 0x8
"IMAGE_IMPORT_DESCRIPTOR": len(bytes(IMAGE_IMPORT_DESCRIPTOR())),
}
short_hdr_names = {
"DOS": "_IMAGE_DOS_HEADER",
"DOS_HEADER": "_IMAGE_DOS_HEADER",
"DOS_HDR": "_IMAGE_DOS_HEADER",
"IMAGE_DOS_HEADER": "_IMAGE_DOS_HEADER",
"PE": "_IMAGE_FILE_HEADER",
"PE_HEADER": "_IMAGE_FILE_HEADER",
"PE_HDR": "_IMAGE_FILE_HEADER",
"FILE_HEADER": "_IMAGE_FILE_HEADER",
"FILE_HDR": "_IMAGE_FILE_HEADER",
"IMAGE_FILE_HEADER": "_IMAGE_FILE_HEADER",
"OPT": "_IMAGE_OPTIONAL_HEADER",
"OPT_HEADER": "_IMAGE_OPTIONAL_HEADER",
"OPT_HDR": "_IMAGE_OPTIONAL_HEADER",
"OPTIONAL": "_IMAGE_OPTIONAL_HEADER",
"OPTIONAL_HEADER": "_IMAGE_OPTIONAL_HEADER",
"OPTIONAL_HDR": "_IMAGE_OPTIONAL_HEADER",
"IMAGE_OPTIONAL_HEADER": "_IMAGE_OPTIONAL_HEADER",
"SECTION_HEADER": "IMAGE_SECTION_HEADER",
"SEC_HEADER": "IMAGE_SECTION_HEADER",
"SEC_HDR": "IMAGE_SECTION_HEADER",
"SECTION_HDR": "IMAGE_SECTION_HEADER",
"SECT_HEADER": "IMAGE_SECTION_HEADER",
"SECT_HDR": "IMAGE_SECTION_HEADER",
}
datadirectory_pos = {0: "IMAGE_DIRECTORY_ENTRY_EXPORT", 1: "IMAGE_DIRECTORY_ENTRY_IMPORT",
2: "IMAGE_DIRECTORY_ENTRY_RESOURCE", 3: "IMAGE_DIRECTORY_ENTRY_EXCEPTION",
4: "IMAGE_DIRECTORY_ENTRY_SECURITY", 5: "IMAGE_DIRECTORY_ENTRY_BASERELOC",
6: "IMAGE_DIRECTORY_ENTRY_DEBUG", 7: "IMAGE_DIRECTORY_ENTRY_COPYRIGHT",
8: "IMAGE_DIRECTORY_ENTRY_GLOBALPTR", 9: "IMAGE_DIRECTORY_ENTRY_TLS",
10: "IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG", 11: "IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT",
12: "IMAGE_DIRECTORY_ENTRY_IAT", 13: "IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT",
14: "IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR", 15: "IMAGE_DIRECTORY_ENTRY_RESERVED"}
datadirectory_entry_to_pos = {"IMAGE_DIRECTORY_ENTRY_EXPORT": 0, "IMAGE_DIRECTORY_ENTRY_IMPORT": 1,
"IMAGE_DIRECTORY_ENTRY_RESOURCE": 2, "IMAGE_DIRECTORY_ENTRY_EXCEPTION": 3,
"IMAGE_DIRECTORY_ENTRY_SECURITY": 4, "IMAGE_DIRECTORY_ENTRY_BASERELOC": 5,
"IMAGE_DIRECTORY_ENTRY_DEBUG": 6, "IMAGE_DIRECTORY_ENTRY_COPYRIGHT": 7,
"IMAGE_DIRECTORY_ENTRY_GLOBALPTR": 8, "IMAGE_DIRECTORY_ENTRY_TLS": 9,
"IMAGE_DIRECTORY_ENTRY_LOAD_CONFIG": 10, "IMAGE_DIRECTORY_ENTRY_BOUND_IMPORT": 11,
"IMAGE_DIRECTORY_ENTRY_IAT": 12, "IMAGE_DIRECTORY_ENTRY_DELAY_IMPORT": 13,
"IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR": 14, "IMAGE_DIRECTORY_ENTRY_RESERVED": 15}
def parse_disk_to_header(sample, query_header=None):
offsets = {}
# Read DOS Header
with open(sample, 'rb') as f:
dos_read = bytearray(f.read(header_sizes["_IMAGE_DOS_HEADER"]))
dos_header = _IMAGE_DOS_HEADER.from_buffer(dos_read)
if getattr(dos_header, "e_magic") != 0x5A4D:
print(f"e_magic = {getattr(dos_header, 'e_magic')}")
print("Wrong DOS Magic Value (MZ). Aborting...")
raise InvalidPEFile
e_lfanew = getattr(dos_header, "e_lfanew")
if query_header == "e_lfanew":
return e_lfanew
if query_header == "_IMAGE_DOS_HEADER":
return dos_header
offsets["_IMAGE_DOS_HEADER"] = 0
# Read PE Header
pe_hdr_offset = e_lfanew
f.seek(pe_hdr_offset)
offsets["_IMAGE_FILE_HEADER"] = pe_hdr_offset
pe_read = bytearray(f.read(header_sizes["_IMAGE_FILE_HEADER"]))
pe_header = _IMAGE_FILE_HEADER.from_buffer(pe_read)
if getattr(pe_header, "Signature") != 0x4550:
print(f"Signature: {getattr(pe_header, 'Signature')}")
print("Wrong PE Header Signature. Aborting...")
raise InvalidPEFile
number_of_sections = getattr(pe_header, "NumberOfSections")
if query_header == "NumberOfSections":
return number_of_sections
if query_header == "_IMAGE_FILE_HEADER":
return pe_header
# Read Optional Header
opt_hdr_offset = pe_hdr_offset + header_sizes["_IMAGE_FILE_HEADER"]
f.seek(opt_hdr_offset)
offsets["_IMAGE_OPTIONAL_HEADER"] = opt_hdr_offset
opt_read = bytearray(f.read(header_sizes["_IMAGE_OPTIONAL_HEADER"]))
opt_header = _IMAGE_OPTIONAL_HEADER.from_buffer(opt_read)
if getattr(opt_header, "Magic") != 0x10B:
print(f"OPT Magic: {getattr(opt_header, 'Magic')}")
print("Wrong Optional Header Magic. Aborting...")
raise InvalidPEFile
if query_header == "_IMAGE_OPTIONAL_HEADER":
return opt_header
if query_header == "_IMAGE_DATA_DIRECTORY":
return getattr(opt_header, "DataDirectory")
rva_to_IMAGE_IMPORT_DESCRIPTOR = getattr(getattr(opt_header, "DataDirectory")[1], "VirtualAddress")
size_import_table = getattr(getattr(opt_header, "DataDirectory")[1], "Size")
# import_table = get_imp(uc, rva_to_IMAGE_IMPORT_DESCRIPTOR, base_addr, size_import_table)
import_descriptor_table = []
# TODO Use this when custom loader finished
# for x in range(int((size_import_table / header_sizes["IMAGE_IMPORT_DESCRIPTOR"]))):
# f.seek(rva_to_IMAGE_IMPORT_DESCRIPTOR)
# imp_descriptor_read = bytearray(f.read(header_sizes["IMAGE_IMPORT_DESCRIPTOR"]))
# imp_descriptor = IMAGE_IMPORT_DESCRIPTOR.from_buffer(imp_descriptor_read)
# if getattr(imp_descriptor, "Characteristics") != 0 or getattr(imp_descriptor, "FirstThunk") != 0:
# import_descriptor_table.append(imp_descriptor)
# rva_to_IMAGE_IMPORT_DESCRIPTOR += header_sizes["IMAGE_IMPORT_DESCRIPTOR"]
# else:
# break
if query_header == "IMPORTS":
return import_descriptor_table
# Read Section Header
section_hdr_offset = opt_hdr_offset + header_sizes["_IMAGE_OPTIONAL_HEADER"]
offsets["IMAGE_SECTION_HEADER"] = section_hdr_offset
section_headers = []
for i in range(number_of_sections):
f.seek(section_hdr_offset)
sec_read = bytearray(f.read(header_sizes["IMAGE_SECTION_HEADER"]))
sec_header = IMAGE_SECTION_HEADER.from_buffer(sec_read)
section_headers.append(sec_header)
section_hdr_offset += header_sizes["IMAGE_SECTION_HEADER"]
if query_header == "IMAGE_SECTION_HEADER":
return section_headers
if query_header == "Offsets":
return offsets
headers = {"_IMAGE_DOS_HEADER": dos_header, "_IMAGE_FILE_HEADER": pe_header,
"_IMAGE_OPTIONAL_HEADER": opt_header,
"IMAGE_SECTION_HEADER": section_headers, "IMPORTS": import_descriptor_table, }
return headers
def get_disk_headers(sample):
return parse_disk_to_header(sample.path)
def conv_to_class_header(header):
header_types = {
_IMAGE_DOS_HEADER: DosHeader,
_IMAGE_FILE_HEADER: PEHeader,
_IMAGE_OPTIONAL_HEADER: OptionalHeader,
IMAGE_SECTION_HEADER: SectionHeader,
IMAGE_IMPORT_DESCRIPTOR: ImportDescriptor,
_IMAGE_DATA_DIRECTORY: DataDirectory,
}
if isinstance(header, list) or isinstance(header, Array):
converted = []
for h in header:
converted.append(conv_to_class_header(h))
return converted
else:
for hdr_type in header_types:
if isinstance(header, hdr_type):
new_header = header_types[hdr_type](header)
if isinstance(new_header, OptionalHeader):
new_header.DataDirectory = conv_to_class_header(new_header.DataDirectory)
return new_header
def parse_memory_to_header(uc, base_addr, query_header=None):
# Read DOS Header
uc_dos = uc.mem_read(base_addr, header_sizes["_IMAGE_DOS_HEADER"])
dos_header = _IMAGE_DOS_HEADER.from_buffer(uc_dos)
if getattr(dos_header, "e_magic") != 0x5A4D:
print(f"e_magic = {getattr(dos_header, 'e_magic')}")
print("Wrong DOS Magic Value (MZ). Aborting...")
raise InvalidPEFile
e_lfanew = getattr(dos_header, "e_lfanew")
if query_header == "e_lfanew":
return e_lfanew
if query_header == "_IMAGE_DOS_HEADER":
return dos_header
# Read PE Header
pe_hdr_offset = base_addr + e_lfanew
uc_pe = uc.mem_read(pe_hdr_offset, header_sizes["_IMAGE_FILE_HEADER"])
pe_header = _IMAGE_FILE_HEADER.from_buffer(uc_pe)
if getattr(pe_header, "Signature") != 0x4550:
print(f"Signature: {getattr(pe_header, 'Signature')}")
print("Wrong PE Header Signature. Aborting...")
raise InvalidPEFile
number_of_sections = getattr(pe_header, "NumberOfSections")
if query_header == "NumberOfSections":
return number_of_sections
if query_header == "_IMAGE_FILE_HEADER":
return pe_header
# Read Optional Header
opt_hdr_offset = pe_hdr_offset + header_sizes["_IMAGE_FILE_HEADER"]
uc_opt = uc.mem_read(opt_hdr_offset, header_sizes["_IMAGE_OPTIONAL_HEADER"])
opt_header = _IMAGE_OPTIONAL_HEADER.from_buffer(uc_opt)
if getattr(opt_header, "Magic") != 0x10B:
print(f"OPT Magic: {getattr(opt_header, 'Magic')}")
print("Wrong Optional Header Magic. Aborting...")
raise InvalidPEFile
if query_header == "_IMAGE_OPTIONAL_HEADER":
return opt_header
if query_header == "_IMAGE_DATA_DIRECTORY":
return getattr(opt_header, "DataDirectory")
rva_to_IMAGE_IMPORT_DESCRIPTOR = getattr(getattr(opt_header, "DataDirectory")[1], "VirtualAddress")
size_import_table = getattr(getattr(opt_header, "DataDirectory")[1], "Size")
import_table = get_imp(uc, rva_to_IMAGE_IMPORT_DESCRIPTOR, base_addr, size_import_table)
if query_header == "IMPORTS":
return import_table
# Read Section Header
section_hdr_offset = opt_hdr_offset + header_sizes["_IMAGE_OPTIONAL_HEADER"]
section_headers = []
for i in range(number_of_sections):
uc_sec = uc.mem_read(section_hdr_offset, header_sizes["IMAGE_SECTION_HEADER"])
sec_header = IMAGE_SECTION_HEADER.from_buffer(uc_sec)
section_headers.append(sec_header)
section_hdr_offset += header_sizes["IMAGE_SECTION_HEADER"]
if query_header == "IMAGE_SECTION_HEADER":
return section_headers
headers = {"_IMAGE_DOS_HEADER": dos_header, "_IMAGE_FILE_HEADER": pe_header, "_IMAGE_OPTIONAL_HEADER": opt_header,
"IMAGE_SECTION_HEADER": section_headers, "IMPORTS": import_table, }
return headers
def get_imp(uc, rva, base_addr, SizeOfImportTable, read_values=False):
rva += base_addr
entry_size = len(bytes(IMAGE_IMPORT_DESCRIPTOR()))
num_of_dll = SizeOfImportTable // entry_size
imp_info_list = []
imp_struct_list = []
for i in range(num_of_dll):
uc_imp = uc.mem_read(rva, entry_size)
imp_struct = IMAGE_IMPORT_DESCRIPTOR.from_buffer(uc_imp)
imp_struct_list.append(imp_struct)
if read_values:
try:
dll_name = get_string(getattr(imp_struct, "Name") + base_addr, uc, break_on_unprintable=True)
imp_names = []
rva_to_iat = getattr(imp_struct, "FirstThunk")
while True:
new_val = struct.unpack("<I", uc.mem_read(base_addr + rva_to_iat, 4))[0]
if new_val == 0:
break
imp_name = (get_string(new_val + 2 + base_addr, uc, break_on_unprintable=True), rva_to_iat)
imp_names.append(imp_name)
rva_to_iat += 4
imp_info_list.append(ImportValues(imp_struct, dll_name, imp_names))
except UcError as ue:
return imp_info_list
rva += entry_size
if read_values:
return imp_info_list
return imp_struct_list
# Deprecated
def print_struc(s, offset, name):
print(name + ":")
for field_name, field_type in s._fields_:
if isinstance(getattr(s, field_name), Array):
print(f"\t +0x{offset:02x} {field_name}:")
sub_offset = offset
for i in range(len(getattr(s, field_name))):
for sub_field_name, sub_field_type in getattr(s, field_name)[i]._fields_:
print(f"\t\t +{hex(sub_offset)} {sub_field_name}: "
f"{getattr(getattr(s, field_name)[i], sub_field_name)}")
sub_offset += len(bytes(sub_field_type()))
else:
print(f"\t +0x{offset:02x} {field_name}: {getattr(s, field_name)}")
offset += len(bytes(field_type()))
def print_struc_rec(s, offset, name, indent='\t', array_dict=None):
if name is not None:
print(f"{Fore.LIGHTYELLOW_EX}{name}:{Fore.RESET}")
for field_name, field_type in s._fields_:
if isinstance(getattr(s, field_name), Array):
print(indent + f" +0x{offset:02x} {field_name}:")
new_indent = indent
for i in range(len(getattr(s, field_name))):
if array_dict is not None:
new_indent = '\t' + new_indent
print(new_indent + f" +0x{offset:02x} {array_dict[i]}:")
if hasattr(getattr(s, field_name)[i], "_fields_"):
offset = print_struc_rec(getattr(s, field_name)[i], offset, None, '\t' + new_indent)
else:
print(indent + f" +0x{offset:02x} {field_name}: {getattr(s, field_name)}")
new_indent = indent
else:
if isinstance(getattr(s, field_name), int):
if "TimeDateStamp" in field_name:
print(f"{indent} +0x{offset:02x} {field_name}: "
f"{Fore.LIGHTRED_EX}"
f"{datetime.utcfromtimestamp(getattr(s, field_name)).strftime('%Y-%m-%d %H:%M:%S')}"
f"{Fore.RESET}")
else:
print(f"{indent} +0x{offset:02x} {field_name}: "
f"{Fore.LIGHTRED_EX}{hex(getattr(s, field_name))}{Fore.RESET}")
else:
print(f"\t +0x{offset:02x} {field_name}: {getattr(s, field_name)}")
offset += len(bytes(field_type()))
return offset
def print_dos_header(uc, base_addr):
dos_header = parse_memory_to_header(uc, base_addr, "_IMAGE_DOS_HEADER")
# print_struc(dos_header, 0, "_IMAGE_DOS_HEADER")
print_struc_rec(dos_header, 0, "_IMAGE_DOS_HEADER")
def print_pe_header(uc, base_addr):
pe_header = parse_memory_to_header(uc, base_addr, "_IMAGE_FILE_HEADER")
offset = parse_memory_to_header(uc, base_addr, "e_lfanew")
print_struc_rec(pe_header, offset, "_IMAGE_FILE_HEADER")
def print_opt_header(uc, base_addr):
opt_header = parse_memory_to_header(uc, base_addr, "_IMAGE_OPTIONAL_HEADER")
offset = parse_memory_to_header(uc, base_addr, "e_lfanew") + header_sizes["_IMAGE_FILE_HEADER"]
print_struc_rec(opt_header, offset, "_IMAGE_OPTIONAL_HEADER", '\t', datadirectory_pos)
# print_struc(opt_header, offset, "_IMAGE_OPTIONAL_HEADER")
def print_section_table(uc, base_addr):
section_table = parse_memory_to_header(uc, base_addr, "IMAGE_SECTION_HEADER")
offset = parse_memory_to_header(uc, base_addr, "e_lfanew") + header_sizes["_IMAGE_FILE_HEADER"] + header_sizes[
"_IMAGE_OPTIONAL_HEADER"]
for i in range(len(section_table)):
print_struc_rec(section_table[i], offset, "IMAGE_SECTION_HEADER")
offset += header_sizes["IMAGE_SECTION_HEADER"]
def print_iat(uc, base_addr):
imp = parse_memory_to_header(uc, base_addr, "IMPORTS")
print(f"{Fore.LIGHTYELLOW_EX}IMPORT ADDRESS TABLE:{Fore.RESET}")
for i in imp:
indent = '\t'
if i.Name == 0:
return
print(f"{indent} Name: {Fore.LIGHTRED_EX}{get_string(base_addr + i.Name, uc)}{Fore.RESET}")
print(f"{indent} Characteristics (Hint/Name): {Fore.LIGHTRED_EX}{hex(i.Characteristics)}{Fore.RESET}")
print(f"{indent} TimeDateStamp: {Fore.LIGHTRED_EX}{hex(i.TimeDateStamp)}{Fore.RESET}")
print(f"{indent} ForwarderChain: {Fore.LIGHTRED_EX}{hex(i.ForwarderChain)}{Fore.RESET}")
print(f"{indent} FirstThunk: {Fore.LIGHTRED_EX}{hex(i.FirstThunk)}{Fore.RESET}")
indent = '\t\t'
if i.Characteristics == 0:
print(f"{indent} Hint/Name Array is not set")
else:
curr_pos = 0
imp_array_element = struct.unpack("<I", uc.mem_read(base_addr + i.Characteristics, 4))[0]
if (imp_array_element >> 20) == 0x1 and ((imp_array_element & 0xFFEFFFFF) >> 14) == 0x1:
print(f"{indent}No resolving of imports as hookaddr values are set")
continue
while imp_array_element != 0:
if imp_array_element >> 0x1f == 1:
print(f"{indent} Import by Ordinal: "
f"{Fore.LIGHTRED_EX}{hex(imp_array_element - 0x80000000)}{Fore.RESET}")
else:
print(f"{indent} Import by Name: "
f"{Fore.LIGHTRED_EX}{get_string(base_addr + imp_array_element + 0x2, uc)}{Fore.RESET}")
curr_pos += 0x4
imp_array_element = struct.unpack("<I", uc.mem_read(base_addr + i.Characteristics + curr_pos, 4))[0]
print()
def print_all_headers(uc, base_addr):
print_dos_header(uc, base_addr)
print()
print_pe_header(uc, base_addr)
print()
print_opt_header(uc, base_addr)
print()
print_section_table(uc, base_addr)
print()
print_iat(uc, base_addr)
def calc_offset(e_lfanew, num_of_sec, base_addr, header=None):
if header in short_hdr_names.keys():
header = short_hdr_names[header]
opt_start = base_addr + e_lfanew + header_sizes["_IMAGE_FILE_HEADER"]
st_start = opt_start + header_sizes["_IMAGE_OPTIONAL_HEADER"]
offsets = {"_IMAGE_DOS_HEADER": (base_addr, base_addr + header_sizes["_IMAGE_DOS_HEADER"]),
"_IMAGE_FILE_HEADER": (base_addr + e_lfanew, opt_start), "_IMAGE_OPTIONAL_HEADER": (opt_start, st_start),
"IMAGE_SECTION_HEADER": (st_start, st_start + (header_sizes["IMAGE_SECTION_HEADER"]) * num_of_sec)}
if header in offsets.keys():
return offsets[header]
return offsets
# TODO update numofsec
def inject_section(uc, base_addr, sec_struct):
soff, eoff = calc_offset(parse_memory_to_header(uc, base_addr, "e_lfanew"),
parse_memory_to_header(uc, base_addr, "NumberOfSections"), base_addr, "SEC_HDR")
payload = bytes(sec_struct)
uc.mem_write(eoff, payload)
# TODO broken
def hdr_write(uc, base_addr, header, array_pos, **fields):
if header in short_hdr_names.keys():
header = short_hdr_names[header]
if header in datadirectory_entry_to_pos.keys():
array_pos = datadirectory_entry_to_pos[header]
header = "_IMAGE_DATA_DIRECTORY"
header_struct = parse_memory_to_header(uc, base_addr, header)
if header_struct is None:
print("Invalid PE File!")
return None
if isinstance(header_struct, Array) or isinstance(header_struct, list):
if array_pos is None:
print("The specified header field is an array. No array position spcified. Selecting first array elemnt")
array_pos = 0
if hasattr(header_struct[array_pos], "_fields_"):
header_struct = header_struct[array_pos]
for k, v in fields:
if hasattr(header_struct, k):
setattr(header_struct, k, v)
class pe_write:
def __init__(self, uc, base_addr, total_size, filename, temporary=False):
data = uc.mem_read(base_addr, total_size)
with open(filename, 'wb+') as f:
f.write(data)
self.temporary = temporary
self.filename = filename
def __enter__ (self):
return self
def __exit__ (self, exc_type, exc_value, traceback):
if self.temporary and os.path.exists(self.filename):
os.remove(self.filename)
def hdr_read(uc, base_addr, header, field, array_pos=None, str_as_bytes=False):
if header in short_hdr_names.keys():
header = short_hdr_names[header]
if header in datadirectory_entry_to_pos.keys():
array_pos = datadirectory_entry_to_pos[header]
header = "_IMAGE_DATA_DIRECTORY"
header_struct = parse_memory_to_header(uc, base_addr, header)
if header_struct is None:
print("Invalid PE File!")
return None
if field is None:
if array_pos is not None:
header_struct = header_struct[array_pos]
return header_struct
if isinstance(header_struct, Array) or isinstance(header_struct, list):
if array_pos is None:
print("The specified header field is an array. No array position spcified. Selecting first array elemnt")
array_pos = 0
if hasattr(header_struct[array_pos], "_fields_"):
return getattr(header_struct[array_pos], field)
if hasattr(header_sizes, field):
ret_val = getattr(header_struct, field)
if isinstance(ret_val, bytes) and not str_as_bytes:
return ret_val.decode('ascii')
return ret_val
print("Requested field not found. Returning None")
return None
class PE(object):
def __init__(self, uc, base_addr):
self.base_addr = base_addr
headers = parse_memory_to_header(uc, self.base_addr)
self.dos_header = headers["_IMAGE_DOS_HEADER"]
self.pe_header = headers["_IMAGE_FILE_HEADER"]
self.opt_header = headers["_IMAGE_OPTIONAL_HEADER"]
self.data_directories = [directory for directory in getattr(headers["_IMAGE_OPTIONAL_HEADER"], "DataDirectory")]
self.section_list = headers["IMAGE_SECTION_HEADER"]
self.DIRECTORY_ENTRY_IMPORT = headers["IMPORTS"]
def update(self, uc, base_addr):
self.base_addr = base_addr
headers = parse_memory_to_header(uc, self.base_addr)
self.dos_header = headers["_IMAGE_DOS_HEADER"]
self.pe_header = headers["_IMAGE_FILE_HEADER"]
self.opt_header = headers["_IMAGE_OPTIONAL_HEADER"]
self.data_directories = [directory for directory in getattr(headers["_IMAGE_OPTIONAL_HEADER"], "DataDirectory")]
self.section_list = headers["IMAGE_SECTION_HEADER"]
self.DIRECTORY_ENTRY_IMPORT = headers["IMPORTS"]
def sync(self, uc):
e_lfanew = self.dos_header.e_lfanew
num_of_sec = self.pe_header.NumberOfSections
offset = calc_offset(e_lfanew, num_of_sec, self.base_addr)
dos_offset, _ = offset["_IMAGE_DOS_HEADER"]
pe_offset, _ = offset["_IMAGE_FILE_HEADER"]
dos_payload = bytes(self.dos_header)
pe_payload = bytes(self.pe_header)
datadirectory_array = _IMAGE_DATA_DIRECTORY * 16
datadirectory = datadirectory_array(*list(self.data_directories))
setattr(self.opt_header, "DataDirectory", datadirectory)
opt_payload = bytes(self.opt_header)
section_array = IMAGE_SECTION_HEADER * num_of_sec
section_table_payload = bytes(section_array(*list(self.section_list)))
combined_payload = pe_payload + opt_payload + section_table_payload
uc.mem_write(dos_offset, dos_payload)
uc.mem_write(pe_offset, combined_payload)