-
Notifications
You must be signed in to change notification settings - Fork 34
/
Copy pathidentify.py
830 lines (735 loc) · 31 KB
/
identify.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
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
import os
import platform
import re
import struct
import subprocess
import sys
import threading
import uuid
import zipfile
import msoffcrypto
from binascii import hexlify
from collections import defaultdict
from typing import Tuple, Union, Dict
import magic
import ssdeep
from cart import get_metadata_only
from assemblyline.common.digests import get_digests_for_file
from assemblyline.common.forge import get_constants
from assemblyline.common.str_utils import dotdump, safe_str
constants = get_constants()
STRONG_INDICATORS = {
'code/vbs': [
re.compile(rb'(^|\n)On[ \t]+Error[ \t]+Resume[ \t]+Next'),
re.compile(rb'(^|\n)(?:Private)?[ \t]*Sub[ \t]+\w+\(*'),
re.compile(rb'(^|\n)End[ \t]+Module'),
re.compile(rb'(^|\n)ExecuteGlobal'),
re.compile(rb'(^|\n)REM[ \t]+'),
re.compile(rb'(ubound|lbound)\('),
re.compile(rb'CreateObject\('),
re.compile(rb'Set[ \t]*\w+[ \t]*=[ \t]*'),
],
'code/javascript': [
re.compile(rb'function([ \t]*|[ \t]+[\w]+[ \t]*)\([\w \t,]*\)[ \t]*{'),
re.compile(rb'\beval[ \t]*\('),
re.compile(rb'new[ \t]+ActiveXObject\('),
re.compile(rb'xfa\.((resolve|create)Node|datasets|form)'),
re.compile(rb'\.oneOfChild'),
re.compile(rb'unescape\('),
re.compile(rb'\.createElement\('),
re.compile(rb'submitForm\('),
],
'code/csharp': [
re.compile(rb'(^|\n)[ \t]*namespace[ \t]+[\w.]+'),
re.compile(rb'(^|\n)[ \t]*using[ \t]+[\w.]+;'),
re.compile(rb'(^|\n)[ \t]*internal[ \t]+class[ \t]+'),
],
'code/php': [
re.compile(rb'(^|\n)<\?php'),
re.compile(rb'namespace[ \t]+[\w.]+'),
re.compile(rb'function[ \t]+\w+[ \t]*\([ \t]*\$[^)]+\)[ \t\n]*{'),
re.compile(rb'\beval[ \t]*\('),
],
'code/c': [
re.compile(rb'(^|\n)(static|typedef)?[ \t]+struct[ \t]+'),
re.compile(rb'(^|\n)#include[ \t]*([<"])[\w./]+([>"])'),
re.compile(rb'(^|\n)#(ifndef|define|endif|pragma)[ \t]+'),
],
'code/python': [
re.compile(rb'(^|\n)[ \t]*if[ \t]+__name__[ \t]*==[ \t]*[\'\"]__main__[\'\"][ \t]*:'),
re.compile(rb'(^|\n)[ \t]*from[ \t]+[\w.]+[ \t]+import[ \t]+[\w.*]+([ \t]+as \w+)?'),
re.compile(rb'(^|\n)[ \t]*def[ \t]*\w+[ \t]*\([^)]*\)[ \t]*:'),
],
'code/rust': [
re.compile(rb'(^|\n)(pub|priv)[ \t]+(struct|enum|impl|const)[ \t]+'),
re.compile(rb'(^|\n)[ \t]*fn[ \t]+\w+[ \t]*\(&self'),
re.compile(rb'(println!|panic!)'),
],
'code/lisp': [
re.compile(rb'(^|\n)[ \t]*\((defmacro|defun|eval-when|in-package|list|export|defvar)[ \t]+'),
],
'code/java': [
re.compile(rb'(^|\n)[ \t]*public[ \t]+class[ \t]+\w+[ \t]*([ \t]+extends[ \t]+\w+[ \t]*)?{'),
re.compile(rb'(^|\n)[\w \t]+\([^)]*\)[ \t]+throws[ \t]+\w+[ \t]*(,[ \t]*\w+[ \t]*)*{'),
],
'code/perl': [
re.compile(rb'(^|\n)[ \t]*my[ \t]+\$\w+[ \t]*='),
re.compile(rb'(^|\n)[ \t]*sub[ \t]+\w+[ \t]*{'),
],
'code/ruby': [
re.compile(rb'(^|\n)[ \t]*require(_all)?[ \t]*\'[\w/]+\''),
re.compile(rb'rescue[ \t]+\w+[ \t]+=>'),
],
'code/go': [
re.compile(rb'(^|\n)[ \t]*import[ \t]+\('),
re.compile(rb'(^|\n)[ \t]*func[ \t]+\w+\('),
],
'code/css': [
re.compile(rb'(^|\n|\})(html|body|footer|span\.|img\.|a\.|\.[a-zA-Z\-.]+)[^{]+{'
rb'[ \t]*(padding|color|width|margin|background|font|text)[^}]+\}'),
],
'text/markdown': [
re.compile(rb'\*[ \t]*`[^`]+`[ \t]*-[ \t]*\w+'),
],
'document/email': [
re.compile(rb'^Content-Type: ', re.MULTILINE),
re.compile(rb'^Subject: ', re.MULTILINE),
re.compile(rb'^MIME-Version: ', re.MULTILINE),
re.compile(rb'^Message-ID: ', re.MULTILINE),
re.compile(rb'^To: ', re.MULTILINE),
re.compile(rb'^From: ', re.MULTILINE),
],
'metadata/sysmon': [
re.compile(rb'<Events>[^>]+'),
re.compile(rb'<Event>[^>]+'),
re.compile(rb'<\/Event>'),
re.compile(rb'<\/Events>'),
],
'code/xml': [
# Check if it has an xml declaration header
re.compile(rb'^\s*<\?xml[^>]+\?>', re.DOTALL | re.MULTILINE),
# Check if it begins and ends with <tag ... and </tag ...> (for informal xml usages)
re.compile(rb'^\s*<(?P<open>[\w:]+).+</(?P=open)>\s*$', re.DOTALL),
# Check if a tag has an xmlns attribute
re.compile(rb'<[^>]+xmlns[:=][^>]+>', re.MULTILINE),
],
'code/ps1': [
# Match one of the common Cmdlets (case-insensitive)
re.compile(rb'(?i)(Get-ExecutionPolicy|Get-Service|Where-Object|ConvertTo-HTML|Select-Object|Get-Process|'
rb'Clear-History|ForEach-Object|Clear-Content|Compare-Object|New-ItemProperty|New-Object|'
rb'New-WebServiceProxy|Set-Alias|Wait-Job|Get-Counter|Test-Path|Get-WinEvent|Start-Sleep|'
rb'Set-Location|Get-ChildItem|Rename-Item|Stop-Process|Add-Type|Out-String|Write-Error)'),
# Match one of the common Classes (case-insensitive)
re.compile(rb'(?i)(-memberDefinition|-Name|-namespace|-passthru|-command|-TypeName)'),
# Match one of the common Methods (case-insensitive)
re.compile(rb'(?i)(\.Get(String|Field|Type|Method)|FromBase64String)\('),
# A .NET class that is commonly used in PowerShell
re.compile(rb'(?i)(System\.Net\.WebClient)'),
]
}
STRONG_SCORE = 15
MINIMUM_GUESS_SCORE = 20
WEAK_INDICATORS = {
'code/javascript': [rb'var ',
rb'document\.write\(',
rb'String\.(fromCharCode|raw)\(',
rb'Math\.(round|pow|sin|cos)\(',
rb'(isNaN|isFinite|parseInt|parseFloat)\(',
b'WSH',
],
'code/jscript': [rb'new[ \t]+ActiveXObject\(', rb'Scripting\.Dictionary'],
'code/pdfjs': [rb'xfa\.((resolve|create)Node|datasets|form)', rb'\.oneOfChild'],
'code/vbs': [
rb'(^|\n)*[ \t]{0,1000}((Dim|Sub|Loop|Attribute|Function|End[ \t]+Function)[ \t]+)|(End[ \t]+Sub)',
b'CreateObject',
b'WScript',
b'window_onload',
b'.SpawnInstance_',
b'.Security_',
b'WSH',
],
'code/csharp': [rb'(^|\n)(protected[ \t]+)?[ \t]*override'],
'code/sql': [rb'(^|\n)(create|drop|select|returns|declare)[ \t]+'],
'code/php': [rb'\$this\->'],
'code/c': [rb'(^|\n)(const[ \t]+char[ \t]+\w+;|extern[ \t]+|uint(8|16|32)_t[ \t]+)'],
'code/python': [b'try:', b'except:', b'else:'],
'code/java': [rb'(^|\n)[ \t]*package[ \t]+[\w\.]+;'],
'code/perl': [rb'(^|\n)[ \t]*package[ \t]+[\w\.]+;', b'@_'],
'text/markdown': [rb'\[[\w]+\]:[ \t]*http:'],
'code/ps1': [
# Check for PowerShell Parameters ex. -Online -FeatureName
rb'\s-([A-Z][a-z0-9]+)+',
# Check for cmdlet names ex. Disable-WindowsOptionalFeature
rb'([A-Z][a-z0-9]+)+-([A-Z][a-z0-9]+)+',
]
}
WEAK_SCORE = 1
WEAK_INDICATORS = {k: re.compile(b'|'.join(v)) for k, v in WEAK_INDICATORS.items()}
SHEBANG = re.compile(rb'^#![\w./]+/(?:env[ \t]*)?(\w+)[ \t]*\n')
EXECUTABLES = {
'escript': 'erlang',
'nush': 'nu',
'macruby': 'ruby',
'jruby': 'ruby',
'rbx': 'ruby',
}
OLE_CLSID_GUIDs = {
# GUID v0 (0)
"00020803-0000-0000-C000-000000000046": "document/office/word", # "MS Graph Chart"
"00020900-0000-0000-C000-000000000046": "document/office/word", # "MS Word95"
"00020901-0000-0000-C000-000000000046": "document/office/word", # "MS Word 6.0 - 7.0 Picture"
"00020906-0000-0000-C000-000000000046": "document/office/word", # "MS Word97"
"00020907-0000-0000-C000-000000000046": "document/office/word", # "MS Word"
"00020C01-0000-0000-C000-000000000046": "document/office/excel", # "Excel"
"00020821-0000-0000-C000-000000000046": "document/office/excel", # "Excel"
"00020820-0000-0000-C000-000000000046": "document/office/excel", # "Excel97"
"00020810-0000-0000-C000-000000000046": "document/office/excel", # "Excel95"
"00021a14-0000-0000-C000-000000000046": "document/office/visio", # "Visio"
"0002CE02-0000-0000-C000-000000000046": "document/office/equation", # "MS Equation 3.0"
"0003000A-0000-0000-C000-000000000046": "document/office/paintbrush", # "Paintbrush Picture",
"0003000C-0000-0000-C000-000000000046": "document/office/package", # "Package"
"000C1084-0000-0000-C000-000000000046": "document/installer/windows", # "Installer Package (MSI)"
"00020D0B-0000-0000-C000-000000000046": "document/email", # "MailMessage"
# GUID v1 (Timestamp & MAC-48)
"29130400-2EED-1069-BF5D-00DD011186B7": "document/office/wordpro", # "Lotus WordPro"
"46E31370-3F7A-11CE-BED6-00AA00611080": "document/office/word", # "MS Forms 2.0 MultiPage"
"5512D110-5CC6-11CF-8D67-00AA00BDCE1D": "document/office/word", # "MS Forms 2.0 HTML SUBMIT"
"5512D11A-5CC6-11CF-8D67-00AA00BDCE1D": "document/office/word", # "MS Forms 2.0 HTML TEXT"
"5512D11C-5CC6-11CF-8D67-00AA00BDCE1D": "document/office/word", # "MS Forms 2.0 HTML Hidden"
"64818D10-4F9B-11CF-86EA-00AA00B929E8": "document/office/powerpoint", # "MS PowerPoint Presentation"
"64818D11-4F9B-11CF-86EA-00AA00B929E8": "document/office/powerpoint", # "MS PowerPoint Presentation"
"11943940-36DE-11CF-953E-00C0A84029E9": "document/office/word", # "MS Photo Editor 3.0 Photo"
"B801CA65-A1FC-11D0-85AD-444553540000": "document/pdf", # "Adobe Acrobat Document"
"A25250C4-50C1-11D3-8EA3-0090271BECDD": "document/office/wordperfect", # "WordPerfect Office"
"C62A69F0-16DC-11CE-9E98-00AA00574A4F": "document/office/word", # "Microsoft Forms 2.0 Form"
"F4754C9B-64F5-4B40-8AF4-679732AC0607": "document/office/word", # Word.Document.12
"BDD1F04B-858B-11D1-B16A-00C0F0283628": "document/office/word", # Doc (see CVE2012-0158)
}
recognized = constants.RECOGNIZED_TYPES
tag_to_extension = {
'archive/chm': '.chm',
'audiovisual/flash': '.swf',
'code/batch': '.bat',
'code/c': '.c',
'code/csharp': '.cs',
'code/hta': '.hta',
'code/html': '.html',
'code/java': '.java',
'code/javascript': '.js',
'code/jscript': '.js',
'code/pdfjs': '.js',
'code/perl': '.pl',
'code/php': '.php',
'code/ps1': '.ps1',
'code/python': '.py',
'code/ruby': '.rb',
'code/vbs': '.vbs',
'code/wsf': '.wsf',
'document/installer/windows': '.msi',
'document/office/excel': '.xls',
'document/office/mhtml': '.mhtml',
'document/office/ole': '.doc',
'document/office/powerpoint': '.ppt',
'document/office/rtf': '.doc',
'document/office/unknown': '.doc',
'document/office/visio': '.vsd',
'document/office/word': '.doc',
'document/office/wordperfect': 'wp',
'document/office/wordpro': 'lwp',
'document/office/onenote': '.one',
'document/pdf': '.pdf',
'document/email': '.eml',
'executable/windows/pe32': '.exe',
'executable/windows/pe64': '.exe',
'executable/windows/dll32': '.dll',
'executable/windows/dll64': '.dll',
'executable/windows/dos': '.exe',
'executable/windows/com': '.exe',
'executable/linux/elf32': '.elf',
'executable/linux/elf64': '.elf',
'executable/linux/so32': '.so',
'executable/linux/so64': '.so',
'java/jar': '.jar',
'silverlight/xap': '.xap',
'meta/shortcut/windows': '.lnk',
}
sl_patterns = [
['tnef', r'Transport Neutral Encapsulation Format'],
['chm', r'MS Windows HtmlHelp Data'],
['windows/dll64', r'^pe32\+ .*dll.*x86\-64'],
['windows/pe64', r'^pe32\+ .*x86\-64.*windows'],
['windows/dll32', r'^pe32 .*dll'],
['windows/pe32', r'^pe32 .*windows'],
['windows/pe', r'^pe unknown.*windows'],
['windows/dos', r'^(ms-)?dos executable'],
['windows/com', r'^com executable'],
['windows/dos', r'^8086 relocatable'],
['linux/elf32', r'^elf 32-bit lsb +executable'],
['linux/elf64', r'^elf 64-bit lsb +executable'],
['linux/so32', r'^elf 32-bit lsb +shared object'],
['linux/so64', r'^elf 64-bit lsb +shared object'],
['mach-o', r'^Mach-O'],
['7-zip', r'^7-zip archive data'],
['ace', r'^ACE archive data'],
['bzip2', r'^bzip2 compressed data'],
['cabinet', r'^installshield cab'],
['cabinet', r'^microsoft cabinet archive data'],
['cpio', r'cpio archive'],
['gzip', r'^gzip compressed data'],
['iso', r'ISO 9660'],
['lzma', r'^LZMA compressed data'],
['rar', r'^rar archive data'],
['tar', r'^(GNU|POSIX) tar archive'],
['ar', r'ar archive'],
['xz', r'^XZ compressed data'],
['zip', r'^zip archive data'],
['tcpdump', r'^(tcpdump|pcap)'],
['pdf', r'^pdf document'],
['bmp', r'^pc bitmap'],
['gif', r'^gif image data'],
['jpg', r'^jpeg image data'],
['png', r'^png image data'],
['installer/windows', r'(Installation Database|Windows Installer)'],
['office/excel', r'Microsoft.*Excel'],
['office/powerpoint', r'Microsoft.*PowerPoint'],
['office/word', r'Microsoft.*Word'],
['office/rtf', r'Rich Text Format'],
['office/ole', r'OLE 2'],
['office/unknown', r'Composite Document File|CDFV2'],
['office/unknown', r'Microsoft.*(OOXML|Document)'],
['office/unknown', r'Number of (Characters|Pages|Words)'],
['flash', r'Macromedia Flash'],
['autorun', r'microsoft windows autorun'],
['batch', r'dos batch file'],
['jar', r'[ (]Jar[) ]'],
['java', r'java program'],
['class', r'java class data'],
['perl', r'perl .*script'],
['php', r'php script'],
['python', r'python .*(script|byte)'],
['shell', r'(shell|sh) script'],
['xml', r'OpenGIS KML'],
['html', r'html'],
['sgml', r'sgml'],
['xml', r'xml'],
['sff', r'Frame Format'],
['shortcut/windows', r'^MS Windows shortcut'],
['email', r'Mime entity text'],
['sysmon', r'MS Windows Vista Event Log'],
]
sl_patterns = [[x[0], re.compile(x[1], re.IGNORECASE)] for x in sl_patterns]
sl_to_tl = {
'windows/com': 'executable',
'windows/dos': 'executable',
'windows/pe32': 'executable',
'windows/pe64': 'executable',
'windows/dll32': 'executable',
'windows/dll64': 'executable',
'linux/elf32': 'executable',
'linux/elf64': 'executable',
'linux/so32': 'executable',
'linux/so64': 'executable',
'mach-o': 'executable',
'7-zip': 'archive',
'bzip2': 'archive',
'cabinet': 'archive',
'gzip': 'archive',
'iso': 'archive',
'rar': 'archive',
'tar': 'archive',
'zip': 'archive',
'tcpdump': 'network',
'pdf': 'document',
'bmp': 'image',
'gif': 'image',
'jpg': 'image',
'png': 'image',
'shortcut/windows': 'meta',
}
# pylint:disable=C0301
tl_patterns = [
['document',
r'Composite Document File|CDFV2|Corel|OLE 2|OpenDocument |Rich Text Format|Microsoft.*'
r'(Document|Excel|PowerPoint|Word|OOXML)|Number of (Characters|Pages|Words)'],
['document', r'PostScript|pdf|MIME entity text'],
['java', r'jar |java'],
['code',
r'Autorun|HTML |KML |LLVM |SGML |Visual C|XML |awk|batch |bytecode|perl|php|program|python'
r'|ruby|color scheme|script text exe|shell script|tcl'],
['network', r'capture'],
['unknown', r'CoreFoundation|Dreamcast|KEYBoard|OSF/Rose|Zope|quota|uImage'],
['unknown', r'disk|file[ ]*system|floppy|tape'],
['audiovisual',
r'Macromedia Flash|Matroska|MIDI data|MPEG|MP4|MPG|MP3|QuickTime|RIFF|WebM|animation|audio|movie|music|ogg'
r'|sound|tracker|video|voice data'],
['executable', r'803?86|COFF|ELF|Mach-O|ia32|executable|kernel|library|libtool|object'],
['unknown', r'Emulator'],
['image', r'DjVu|Surface|XCursor|bitmap|cursor|color|font|graphics|icon|image|jpeg'],
['archive',
r'BinHex|InstallShield CAB|Transport Neutral Encapsulation Format|archive data|compress|mcrypt'
r'|MS Windows HtmlHelp Data|current ar archive|cpio archive|ISO 9660'],
['meta', r'^MS Windows shortcut'],
['metadata', r'MS Windows Vista Event Log'],
['unknown', r'.*'],
]
trusted_mimes = {
'application/x-bittorrent': 'meta/torrent',
'application/x-tar': 'archive/tar',
'message/rfc822': 'document/email',
'text/calendar': 'text/calendar',
'image/svg+xml': 'image/svg',
'application/x-mach-binary': 'executable/mach-o',
'application/vnd.ms-outlook': 'document/office/email',
'application/x-iso9660-image': 'archive/iso',
}
tl_patterns = [[x[0], re.compile(x[1], re.IGNORECASE)] for x in tl_patterns]
custom = re.compile(r'^custom: ', re.IGNORECASE)
ssdeep_from_file = None
magic_lock = None
file_type = None
mime_type = None
if platform.system() != 'Windows':
magic_lock = threading.Lock()
file_type = magic.magic_open(magic.MAGIC_CONTINUE + magic.MAGIC_RAW)
magic.magic_load(file_type, constants.RULE_PATH)
mime_type = magic.magic_open(magic.MAGIC_CONTINUE + magic.MAGIC_RAW + magic.MAGIC_MIME)
magic.magic_load(mime_type, constants.RULE_PATH)
ssdeep_from_file = ssdeep.hash_from_file
# Translate the match object into a sub-type label.
def _subtype(label: str) -> str:
for entry in sl_patterns:
if entry[1].search(label): # pylint: disable=E1101
return entry[0]
return 'unknown'
def ident(buf, length: int, path) -> Dict:
data = {'ascii': None, 'hex': None, 'magic': None, 'mime': None, 'type': 'unknown'}
if length <= 0:
return data
header = buf[:min(64, length)]
data['ascii'] = dotdump(header)
data['hex'] = safe_str(hexlify(header))
# noinspection PyBroadException
try:
# Loop over the labels returned by libmagic, ...
labels = []
if file_type:
with magic_lock:
try:
labels = magic.magic_file(file_type, path).split(b'\n')
except magic.MagicException as me:
labels = me.message.split(b'\n')
labels = [label[2:].strip() if label.startswith(b'- ') else label.strip() for label in labels]
mimes = []
if mime_type:
with magic_lock:
try:
mimes = magic.magic_file(mime_type, path).split(b'\n')
except magic.MagicException as me:
labels = me.message.split(b'\n')
mimes = [mime[2:].strip() if mime.startswith(b'- ') else mime.strip() for mime in mimes]
# For user feedback set the mime and magic meta data to always be the primary
# libmagic responses
if len(labels) > 0:
data['magic'] = safe_str(labels[0])
if len(mimes) > 0 and mimes[0] != b'':
data['mime'] = safe_str(mimes[0])
# Highest priority is given to mime type matching something
tagged = False
for label in labels:
label = dotdump(label)
if custom.match(label):
data['type'] = label.split('custom: ')[1].strip()
tagged = True
break
# Second priority is mime times marked as trusted
if not tagged:
for mime in mimes:
mime = dotdump(mime)
if mime in trusted_mimes:
data['type'] = trusted_mimes[mime]
tagged = True
break
# As a third priority try matching the tl_patterns
if not tagged:
minimum = len(tl_patterns)
sl_tag = None
# Try each label and see how far down the tl_patterns list we go
# before we hit a match, the closer to the beginning of the list we are the better
# the tag match is. The final line of tl_patterns matches anything and sets
# tag to 'unknown', so this loop should never finish with sl_tag as None
# Unless the tl_patters table has been changed inappropriately
for label in labels:
label = dotdump(label)
# ... match against our patterns and, ...
index = 0
for entry in tl_patterns:
if index >= minimum:
break
if entry[1].search(label): # pylint:disable=E1101
break
index += 1
# ... keep highest precedence (lowest index) match.
if index < minimum:
minimum = index
sl_tag = _subtype(label)
# If a label does match, take the best from that label
# Further labels from magic are probably terrible
break
assert sl_tag is not None, "tl_patterns seems to be missing a match all => unknown rule at the end"
# Based on the sub tag we found, figure out the top level tag to use
tl_tag = sl_to_tl.get(sl_tag, tl_patterns[minimum][0])
data['type'] = '/'.join((tl_tag, sl_tag))
except Exception as e:
print(str(e))
pass
if not recognized.get(data['type'], False):
data['type'] = 'unknown'
if data['type'] == 'document/office/unknown':
# noinspection PyBroadException
try:
root_entry_property_offset = buf.find(u"Root Entry".encode("utf-16-le"))
if -1 != root_entry_property_offset:
# Get root entry's GUID and try to guess document type
clsid_offset = root_entry_property_offset + 0x50
if len(buf) >= clsid_offset + 16:
clsid = buf[clsid_offset:clsid_offset + 16]
if len(clsid) == 16 and clsid != b"\0" * len(clsid):
clsid_str = uuid.UUID(bytes_le=clsid)
clsid_str = clsid_str.urn.rsplit(':', 1)[-1].upper()
if clsid_str in OLE_CLSID_GUIDs:
data['type'] = OLE_CLSID_GUIDs[clsid_str]
else:
bup_details_offset = buf[:root_entry_property_offset+0x100].find(u"Details".encode("utf-16-le"))
if -1 != bup_details_offset:
data['type'] = 'quarantine/mcafee'
except Exception:
pass
return data
def _confidence(score: Union[int, float]) -> str:
conf = float(score) / float(STRONG_SCORE * 5)
conf = min(1.0, conf) * 100
return str(int(conf)) + r'%'
def _differentiate(lang: str, scores_map: Dict) -> str:
if lang == 'code/javascript':
jscript_score = scores_map['code/jscript']
pdfjs_score = scores_map['code/pdfjs']
if pdfjs_score > 0 and pdfjs_score > jscript_score:
return 'code/pdfjs'
elif jscript_score > 0:
return 'code/jscript'
return lang
# Pass a filepath and this will return the guessed language in the AL tag format.
def _guess_language(path: str) -> Tuple[str, Union[str, int]]:
file_length = os.path.getsize(path)
with open(path, 'rb') as fh:
if file_length > 131070:
buf = fh.read(65535)
fh.seek(file_length - 65535)
buf += fh.read(65535)
else:
buf = fh.read()
scores = defaultdict(int)
shebang_lang = re.match(SHEBANG, buf)
if shebang_lang:
lang = shebang_lang.group(1)
lang = 'code/' + EXECUTABLES.get(safe_str(lang), safe_str(lang))
scores[lang] = STRONG_SCORE * 3
for lang, patterns in STRONG_INDICATORS.items():
for pattern in patterns:
for _ in re.findall(pattern, buf):
scores[lang] += STRONG_SCORE
for lang, pattern in WEAK_INDICATORS.items():
for _ in re.findall(pattern, buf):
scores[lang] += WEAK_SCORE
for lang in list(scores.keys()):
if scores[lang] < MINIMUM_GUESS_SCORE:
scores.pop(lang)
max_v = 0
if len(scores) > 0:
max_v = max(list(scores.values()))
high_scores = [(k, v) for k, v in scores.items() if v == max_v]
high_scores = [(_differentiate(k, scores), v) for k, v in high_scores]
if len(high_scores) != 1:
return 'unknown', 0
else:
confidences = [(k, _confidence(v)) for k, v in high_scores]
return confidences[0]
# noinspection PyBroadException
def zip_ident(path: str, fallback: str = None) -> str:
file_list = []
try:
with zipfile.ZipFile(path, "r") as zf:
file_list = [zfname for zfname in zf.namelist()]
except Exception:
try:
stdout, _ = subprocess.Popen(["unzip", "-l", path],
stderr=subprocess.PIPE,
stdout=subprocess.PIPE).communicate()
lines = stdout.splitlines()
index = lines[1].index(b"Name")
for file_name in lines[3:-2]:
file_list.append(safe_str(file_name[index:]))
except Exception:
if fallback is not None:
return fallback
tot_files = 0
tot_class = 0
tot_jar = 0
is_ipa = False
is_jar = False
is_word = False
is_excel = False
is_ppt = False
doc_props = False
doc_rels = False
doc_types = False
android_manifest = False
android_dex = False
for file_name in file_list:
if file_name[:8] == 'META-INF' and file_name[9:] == 'MANIFEST.MF':
is_jar = True
elif file_name == 'AndroidManifest.xml':
android_manifest = True
elif file_name == 'classes.dex':
android_dex = True
elif file_name.startswith('Payload/') and file_name.endswith(".app/Info.plist"):
is_ipa = True
elif file_name.endswith(".class"):
tot_class += 1
elif file_name.endswith(".jar"):
tot_jar += 1
elif file_name.startswith('word/'):
is_word = True
elif file_name.startswith('xl/'):
is_excel = True
elif file_name.startswith('ppt/'):
is_ppt = True
elif file_name.startswith('docProps/'):
doc_props = True
elif file_name.startswith('_rels/'):
doc_rels = True
elif file_name == '[Content_Types].xml':
doc_types = True
tot_files += 1
if 0 < tot_files < (tot_class + tot_jar) * 2:
is_jar = True
if is_jar and android_manifest and android_dex:
return 'android/apk'
elif is_ipa:
return 'ios/ipa'
elif is_jar:
return 'java/jar'
elif (doc_props or doc_rels) and doc_types:
if is_word:
return 'document/office/word'
elif is_excel:
return 'document/office/excel'
elif is_ppt:
return 'document/office/powerpoint'
else:
return 'document/office/unknown'
else:
return 'archive/zip'
# noinspection PyBroadException
def cart_ident(path: str) -> str:
try:
metadata = get_metadata_only(path)
except Exception:
return 'corrupted/cart'
return metadata.get('al', {}).get('type', 'archive/cart')
def dos_ident(path: str) -> str:
# noinspection PyBroadException
try:
with open(path, "rb") as fh:
file_header = fh.read(0x40)
if file_header[0:2] != b"MZ":
raise ValueError()
header_pos, = struct.unpack("<I", file_header[-4:])
fh.seek(header_pos)
if fh.read(4) != b"PE\x00\x00":
raise ValueError()
machine_id, = struct.unpack("<H", fh.read(2))
if machine_id == 0x014c:
width = 32
elif machine_id == 0x8664:
width = 64
else:
raise ValueError()
characteristics, = struct.unpack("<H", fh.read(18)[-2:])
if characteristics & 0x2000:
pe_type = "dll"
elif characteristics & 0x0002:
pe_type = "pe"
else:
raise ValueError()
return "executable/windows/%s%i" % (pe_type, width)
except Exception:
pass
return "executable/windows/dos"
def fileinfo(path: str) -> Dict:
path = safe_str(path)
data = get_digests_for_file(path, on_first_block=ident)
# This is a special case, we know if the mime is set to one of these values
# then the input file is almost certainly an office file, but based on only the first
# block magic can't figure out any more than that. To handle that case we will read the
# entire file, and identify again.
if data['mime'] is not None and data['mime'].lower() in ['application/cdfv2-corrupt', 'application/cdfv2-unknown']:
with open(path, 'rb') as fh:
buf = fh.read()
buflen = len(buf)
data.update(ident(buf, buflen, path))
data['ssdeep'] = ssdeep_from_file(path) if ssdeep_from_file else ''
# When data is parsed from a cart file we trust its metatdata and can skip the recognition test later
cart_metadata_set = False
if not int(data.get('size', -1)):
data['type'] = 'empty'
elif data['type'] in ['archive/zip', 'java/jar']:
# In addition to explicit zip files, we also want to run zip_ident when
# a file is a jar as there is a high rate of false positive (magic
# matching eclipse and other java related files as jars)
data['type'] = zip_ident(path)
elif data['type'] == 'document/office/unknown':
# For unknown document files try identifying them by unziping,
# but don't commit to it being a zip if it can't be extracted
data['type'] = zip_ident(path, data['type'])
elif data['type'] == 'unknown':
data['type'], _ = _guess_language(path)
elif data['type'] == 'archive/cart':
data['type'] = cart_ident(path)
cart_metadata_set = True
elif data['type'] == 'executable/windows/dos':
# The default magic file misidentifies PE files with a munged DOS header
data['type'] = dos_ident(path)
elif data['type'] == 'code/html':
# Magic detects .hta files as .html, guess_language detects .hta files as .js/.vbs
# If both conditions are met, it's fair to say that the file is an .hta
lang, _ = _guess_language(path)
if lang in ["code/javascript", "code/vbs"]:
data['type'] = 'code/hta'
if data['type'] in ['document/office/word', 'document/office/excel',
'document/office/powerpoint', 'document/office/unknown']:
try:
msoffcrypto_obj = msoffcrypto.OfficeFile(open(path, "rb"))
if msoffcrypto_obj and msoffcrypto_obj.is_encrypted():
data['type'] = 'document/office/passwordprotected'
except Exception:
# If msoffcrypto can't handle the file to confirm that it is/isn't password protected,
# then it's not meant to be. Moving on!
pass
if not recognized.get(data['type'], False) and not cart_metadata_set:
data['type'] = 'unknown'
return data
if __name__ == '__main__':
from pprint import pprint
# noinspection PyBroadException
if len(sys.argv) > 1:
pprint(fileinfo(sys.argv[1]))
else:
name = sys.stdin.readline().strip()
while name:
a = fileinfo(name)
print('\t'.join(dotdump(str(a[k])) for k in ('type', 'ascii',
'entropy', 'hex', 'magic',
'mime', 'md5', 'sha1', 'sha256',
'ssdeep', 'size')))
name = sys.stdin.readline().strip()