forked from HarmJ0y/pylnker
-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathpylnker.py
executable file
·964 lines (826 loc) · 40.3 KB
/
pylnker.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
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
# Copyright (C) 2017 KillerInstinct
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import logging
from binascii import hexlify
from base64 import b64encode
from datetime import datetime
from mmap import mmap, ACCESS_READ
from struct import unpack
from struct import error as struct_error
logging.basicConfig()
log = logging.getLogger(__name__)
class Pylnker(object):
# HASH of flag attributes
flag_hash = [[_, 1] for _ in range(27)]
flag_hash[0][1] = "HasLinkTargetIDList"
flag_hash[1][1] = "HasLinkInfo"
flag_hash[2][1] = "HasName"
flag_hash[3][1] = "HasRelativePath"
flag_hash[4][1] = "HasWorkingDir"
flag_hash[5][1] = "HasArguments"
flag_hash[6][1] = "HasIconLocation"
flag_hash[7][1] = "IsUnicode"
flag_hash[8][1] = "ForceNoLinkInfo"
flag_hash[9][1] = "HasExpString"
flag_hash[10][1] = "RunInSeparateProcess"
flag_hash[11][1] = "Unused1"
flag_hash[12][1] = "HasDarwinID"
flag_hash[13][1] = "RunAsUser"
flag_hash[14][1] = "HasExpIcon"
flag_hash[15][1] = "NoPidlAlias"
flag_hash[16][1] = "Unused2"
flag_hash[17][1] = "RunWithShimLayer"
flag_hash[18][1] = "ForceNoLinkTrack"
flag_hash[19][1] = "EnableTargetMetadata"
flag_hash[20][1] = "DisableLinkPathTracking"
flag_hash[21][1] = "DisableKnownFolderTracking"
flag_hash[22][1] = "DisableKnownFolderAlias"
flag_hash[23][1] = "AllowLinkToLink"
flag_hash[24][1] = "UnaliasOnSave"
flag_hash[25][1] = "PreferEnvironmentPath"
flag_hash[26][1] = "KeepLocalIDListForUNCTarget"
# HASH of FileAttributes
file_hash = [[_, 1] for _ in range(17)]
file_hash[0][1] = "FILE_ATTRIBUTE_READONLY"
file_hash[1][1] = "FILE_ATTRIBUTE_HIDDEN"
file_hash[2][1] = "FILE_ATTRIBUTE_SYSTEM"
file_hash[3][1] = "VOLUME LABEL TARGET (not possible)"
file_hash[4][1] = "FILE_ATTRIBUTE_DIRECTORY"
file_hash[5][1] = "FILE_ATTRIBUTE_ARCHIVE"
file_hash[6][1] = "NTFS EFS (not possible)"
file_hash[7][1] = "FILE_ATTRIBUTE_NORMAL"
file_hash[8][1] = "FILE_ATTRIBUTE_TEMPORARY"
file_hash[9][1] = "FILE_ATTRIBUTE_SPARSE_FILE"
file_hash[10][1] = "FILE_ATTRIBUTE_REPARSE_POINT"
file_hash[11][1] = "FILE_ATTRIBUTE_COMPRESSED"
file_hash[12][1] = "FILE_ATTRIBUTE_OFFLINE"
file_hash[13][1] = "FILE_ATTRIBUTE_NOT_CONTENT_INDEXED"
file_hash[14][1] = "FILE_ATTRIBUTE_ENCRYPTED"
file_hash[15][1] = "Unknown (seen on Windows 95 fat)"
file_hash[16][1] = "FILE_ATTRIBUTE_VIRTUAL (reserved for future use)"
# Hash of ShowWnd values
show_wnd_hash = [_ for _ in range(11)]
show_wnd_hash[0] = "SW_HIDE"
show_wnd_hash[1] = "SW_NORMAL"
show_wnd_hash[2] = "SW_SHOWMINIMIZED"
show_wnd_hash[3] = "SW_SHOWMAXIMIZED"
show_wnd_hash[4] = "SW_SHOWNOACTIVE"
show_wnd_hash[5] = "SW_SHOW"
show_wnd_hash[6] = "SW_MINIMIZE"
show_wnd_hash[7] = "SW_SHOWMINNOACTIVE"
show_wnd_hash[8] = "SW_SHOWNA"
show_wnd_hash[9] = "SW_RESTORE"
show_wnd_hash[10] = "SW_SHOWDEFAULT"
# Hash for Volume types
drive_type_hash = [_ for _ in range(7)]
drive_type_hash[0] = "Unknown"
drive_type_hash[1] = "No root directory"
drive_type_hash[2] = "Removable (Floppy,Zip,USB,etc.)"
drive_type_hash[3] = "Fixed (Hard Disk)"
drive_type_hash[4] = "Remote (Network Drive)"
drive_type_hash[5] = "CD-ROM"
drive_type_hash[6] = "RAM Drive"
# Hash of LinkInfo flags
link_info_flags_hash = [[_, 1] for _ in range(2)]
link_info_flags_hash[0][1] = "VolumeIDAndLocalBasePath"
link_info_flags_hash[1][1] = "CommonNetworkRelativeLinkAndPathSuffix"
# Has of Network Relative Link Flags
nrl_flags_hash = [[_, 1] for _ in range(2)]
nrl_flags_hash[0][1] = "ValidDevice"
nrl_flags_hash[1][1] = "ValidNetType"
# HASH of HotKeyFlags
hot_key_value = {
0: "None",
48: "0",
49: "1",
50: "2",
51: "3",
52: "4",
53: "5",
54: "6",
55: "7",
56: "8",
57: "9",
65: "A",
66: "B",
67: "C",
68: "D",
69: "E",
70: "F",
71: "G",
72: "H",
73: "I",
74: "J",
75: "K",
76: "L",
77: "M",
78: "N",
79: "O",
80: "P",
81: "Q",
82: "R",
83: "S",
84: "T",
85: "U",
86: "V",
87: "W",
88: "X",
89: "Y",
99: "Z",
112: "F1",
113: "F2",
114: "F3",
115: "F4",
116: "F5",
117: "F6",
118: "F7",
119: "F8",
120: "F9",
121: "F10",
122: "F11",
123: "F12",
}
known_folder_name = {
"DE61D971-5EBC-4F02-A3A9-6C82895E5C04": "AddNewPrograms",
"724EF170-A42D-4FEF-9F26-B60E846FBA4F": "AdminTools",
"A520A1A4-1780-4FF6-BD18-167343C5AF16": "AppDataLow",
"A305CE99-F527-492B-8B1A-7E76FA98D6E4": "AppUpdates",
"9E52AB10-F80D-49DF-ACB8-4330F5687855": "CDBurning",
"DF7266AC-9274-4867-8D55-3BD661DE872D": "ChangeRemovePrograms",
"D0384E7D-BAC3-4797-8F14-CBA229B392B5": "CommonAdminTools",
"C1BAE2D0-10DF-4334-BEDD-7AA20B227A9D": "CommonOEMLinks",
"0139D44E-6AFE-49F2-8690-3DAFCAE6FFB8": "CommonPrograms",
"A4115719-D62E-491D-AA7C-E74B8BE3B067": "CommonStartMenu",
"82A5EA35-D9CD-47C5-9629-E15D2F714E6E": "CommonStartup",
"B94237E7-57AC-4347-9151-B08C6C32D1F7": "CommonTemplates",
"0AC0837C-BBF8-452A-850D-79D08E667CA7": "Computer",
"4BFEFB45-347D-4006-A5BE-AC0CB0567192": "Conflict",
"6F0CD92B-2E97-45D1-88FF-B0D186B8DEDD": "Connections",
"56784854-C6CB-462B-8169-88E350ACB882": "Contacts",
"82A74AEB-AEB4-465C-A014-D097EE346D63": "ControlPanel",
"2B0F765D-C0E9-4171-908E-08A611B84FF6": "Cookies",
"B4BFCC3A-DB2C-424C-B029-7FE99A87C641": "Desktop",
"FDD39AD0-238F-46AF-ADB4-6C85480369C7": "Documents",
"374DE290-123F-4565-9164-39C4925E467B": "Downloads",
"1777F761-68AD-4D8A-87BD-30B759FA33DD": "Favorites",
"FD228CB7-AE11-4AE3-864C-16F3910AB8FE": "Fonts",
"CAC52C1A-B53D-4EDC-92D7-6B2E8AC19434": "Games",
"054FAE61-4DD8-4787-80B6-090220C4B700": "GameTasks",
"D9DC8A3B-B784-432E-A781-5A1130A75963": "History",
"4D9F7874-4E0C-4904-967B-40B0D20C3E4B": "Internet",
"352481E8-33BE-4251-BA85-6007CAEDCF9D": "InternetCache",
"BFB9D5E0-C6A9-404C-B2B2-AE6DB6AF4968": "Links",
"F1B32785-6FBA-4FCF-9D55-7B8E7F157091": "LocalAppData",
"2A00375E-224C-49DE-B8D1-440DF7EF3DDC": "LocalizedResourcesDir",
"4BD8D571-6D19-48D3-BE97-422220080E43": "Music",
"C5ABBF53-E17F-4121-8900-86626FC2C973": "NetHood",
"D20BEEC4-5CA8-4905-AE3B-BF251EA09B53": "Network",
"2C36C0AA-5812-4B87-BFD0-4CD0DFB19B39": "OriginalImages",
"69D2CF90-FC33-4FB7-9A0C-EBB0F0FCB43C": "PhotoAlbums",
"33E28130-4E1E-4676-835A-98395C3BC3BB": "Pictures",
"DE92C1C7-837F-4F69-A3BB-86E631204A23": "Playlists",
"76FC4E2D-D6AD-4519-A663-37BD56068185": "Printers",
"9274BD8D-CFD1-41C3-B35E-B13F55A758F4": "PrintHood",
"5E6C858F-0E22-4760-9AFE-EA3317B67173": "Profile",
"62AB5D82-FDC1-4DC3-A9DD-070D1D495D97": "ProgramData",
"905E63B6-C1BF-494E-B29C-65B732D3D21A": "ProgramFiles",
"F7F1ED05-9F6D-47A2-AAAE-29D317C6F066": "ProgramFilesCommon",
"6365D5A7-0F0D-45E5-87F6-0DA56B6A4F7D": "ProgramFilesCommonX64",
"DE974D24-D9C6-4D3E-BF91-F4455120B917": "ProgramFilesCommonX86",
"6D809377-6AF0-444B-8957-A3773F02200E": "ProgramFilesX64",
"7C5A40EF-A0FB-4BFC-874A-C0F2E0B9FA8E": "ProgramFilesX86",
"A77F5D77-2E2B-44C3-A6A2-ABA601054A51": "Programs",
"DFDF76A2-C82A-4D63-906A-5644AC457385": "Public",
"C4AA340D-F20F-4863-AFEF-F87EF2E6BA25": "PublicDesktop",
"ED4824AF-DCE4-45A8-81E2-FC7965083634": "PublicDocuments",
"3D644C9B-1FB8-4F30-9B45-F670235F79C0": "PublicDownloads",
"DEBF2536-E1A8-4C59-B6A2-414586476AEA": "PublicGameTasks",
"3214FAB5-9757-4298-BB61-92A9DEAA44FF": "PublicMusic",
"B6EBFB86-6907-413C-9AF7-4FC2ABF07CC5": "PublicPictures",
"2400183A-6185-49FB-A2D8-4A392A602BA3": "PublicVideos",
"52A4F021-7B75-48A9-9F6B-4B87A210BC8F": "QuickLaunch",
"AE50C081-EBD2-438A-8655-8A092E34987A": "Recent",
"BD85E001-112E-431E-983B-7B15AC09FFF1": "RecordedTV",
"B7534046-3ECB-4C18-BE4E-64CD4CB7D6AC": "RecycleBin",
"8AD10C31-2ADB-4296-A8F7-E4701232C972": "ResourceDir",
"3EB685DB-65F9-4CF6-A03A-E3EF65729F3D": "RoamingAppData",
"B250C668-F57D-4EE1-A63C-290EE7D1AA1F": "SampleMusic",
"C4900540-2379-4C75-844B-64E6FAF8716B": "SamplePictures",
"15CA69B3-30EE-49C1-ACE1-6B5EC372AFB5": "SamplePlaylists",
"859EAD94-2E85-48AD-A71A-0969CB56A6CD": "SampleVideos",
"4C5C32FF-BB9D-43B0-B5B4-2D72E54EAAA4": "SavedGames",
"7D1D3A04-DEBB-4115-95CF-2F29DA2920DA": "SavedSearches",
"EE32E446-31CA-4ABA-814F-A5EBD2FD6D5E": "SEARCH_CSC",
"98EC0E18-2098-4D44-8644-66979315A281": "SEARCH_MAPI",
"190337D1-B8CA-4121-A639-6D472D16972A": "SearchHome",
"8983036C-27C0-404B-8F08-102D10DCFD74": "SendTo",
"7B396E54-9EC5-4300-BE0A-2482EBAE1A26": "SidebarDefaultParts",
"A75D362E-50FC-4FB7-AC2C-A8BEAA314493": "SidebarParts",
"625B53C3-AB48-4EC1-BA1F-A1EF4146FC19": "StartMenu",
"B97D20BB-F46A-4C97-BA10-5E3608430854": "Startup",
"43668BF8-C14E-49B2-97C9-747784D784B7": "SyncManager",
"289A9A43-BE44-4057-A41B-587A76D7E7F9": "SyncResults",
"0F214138-B1D3-4A90-BBA9-27CBC0C5389A": "SyncSetup",
"1AC14E77-02E7-4E5D-B744-2EB1AE5198B7": "System",
"D65231B0-B2F1-4857-A4CE-A8E7C6EA7D27": "SystemX86",
"A63293E8-664E-48DB-A079-DF759E0509F7": "Templates",
"5B3749AD-B49F-49C1-83EB-15370FBD4882": "TreeProperties",
"0762D272-C50A-4BB0-A382-697DCD729B80": "UserProfiles",
"F3CE0F7C-4901-4ACC-8648-D5D44B04EF8F": "UsersFiles",
"18989B1D-99B5-455B-841C-AB7C74E4DDFC": "Videos",
"F38BF404-1D43-42F2-9305-67DE0B28FC23": "Windows",
}
def __init__(self, lnk_path):
self.path = lnk_path
self.lnk_obj = None
self.end_offset = 0
self.data = {
"Link_Flags": [],
"File_Attributes": [],
"Create_Time": "Not Set",
"Access_Time": "Not Set",
"Write_Time": "Not Set",
"File_Size": "",
"Icon_Index": "",
"Show_Command": "",
"Hot_Key": "",
"Target": {},
"Link_Info": {},
"String_Data": {
"Name_String": "",
"Relative_Path": "",
"Working_Directory": "",
"Command_Line_Arguments": "",
"Icon_Location": "",
},
"Extra_Data": {}
}
# Helper functions to resolve hot keys/known folders
def hot_key_hash(self, hot_key):
return self.hot_key_value.get(hot_key, "Unknown")
def known_folder_name_hash(self, folder):
return self.known_folder_name.get(folder.upper(), "Unknown")
# Helper functions for operating on the lnk_obj in the class
def lnk_open(self):
self.lnk_obj = open(self.path, "rb")
def lnk_close(self):
self.lnk_obj.close()
def get_block_size_from_signature_offset(self, offset):
self.lnk_obj.seek(offset - 4)
return unpack("i", self.lnk_obj.read(4))[0]
def set_end_offset(self, offset):
# end_offset = x bytes of data (length 'x' of the next segment) - offset length (DWORD)
end_offset = self.get_block_size_from_signature_offset(offset) - 4 + offset
if end_offset > self.end_offset:
self.end_offset = end_offset
@staticmethod
def reverse_hex(hex_str):
hex_vals = [hex_str[i:i + 2].decode("utf8") for i in range(0, 16, 2)]
reverse_hex_vals = hex_vals[::-1]
return "".join(reverse_hex_vals)
@staticmethod
def ms_time_to_unix(windows_time):
unix_time = windows_time / 10000000.0 - 11644473600
return datetime.utcfromtimestamp(unix_time).isoformat(sep=" ")
def assert_lnk_signature(self):
self.lnk_obj.seek(0)
sig = self.lnk_obj.read(4)
if sig != b"L\x00\x00\x00":
log.error("This is not a .lnk file.")
return False
guid = self.lnk_obj.read(16)
if guid != b"\x01\x14\x02\x00\x00\x00\x00\x00\xc0\x00\x00\x00\x00\x00\x00F":
log.error("Cannot read this kind of .lnk file.")
return False
return True
# read COUNT bytes at LOC and unpack into ascii
def read_unpack_ascii(self, loc, count):
self.lnk_obj.seek(loc)
return unpack("{}s".format(count), self.lnk_obj.read(count))[0].decode("utf8").replace("\x00", "")
# read COUNT bytes at LOC and unpack into binary
def read_unpack_bin(self, loc, count):
self.lnk_obj.seek(loc)
raw = self.lnk_obj.read(count)
result = ""
for b in raw:
if isinstance(b, str):
b = ord(b)
result += ("{0:08b}".format(b))[::-1]
return result
# read COUNT bytes at LOC
def read_unpack(self, loc, count):
self.lnk_obj.seek(loc)
return hexlify(self.lnk_obj.read(count))
# Read a null terminated string from the specified location.
def read_null_term(self, loc):
self.lnk_obj.seek(loc)
b = self.lnk_obj.read(1)
result = ""
while b != b"\x00":
result += b.decode("utf8")
b = self.lnk_obj.read(1)
return result
def add_info(self, loc):
"""
Parses a WORD (CountCharacters) which then gives us a length to parse. Double this length to account for
Unicode data
:param loc: Index in the file to seek to
:return: a tuple with the string, and the current file index
"""
self.lnk_obj.seek(loc)
count_characters = unpack("h", self.lnk_obj.read(2))[0]
length = count_characters * 2
if length != 0:
tmp_string = unpack("{}s".format(length), self.lnk_obj.read(length))[0].decode("utf8").replace("\x00", "")
now_loc = self.lnk_obj.tell()
return tmp_string, now_loc
now_loc = self.lnk_obj.tell()
return "", now_loc
@staticmethod
def split_count(s, count):
return ":".join(s[i:i + count].decode("utf8") for i in range(0, len(s), count))
def structure(self, struct_end, v):
# get the number of items
if v == "t":
items_hex = self.reverse_hex(self.read_unpack(struct_end, 2))
items = int(items_hex, 16)
list_end = struct_end + 2 + items
else:
items_hex = self.reverse_hex(self.read_unpack(struct_end, 4))
items = int(items_hex, 16)
list_end = struct_end + 0 + items
struct_end = list_end
return struct_end
def parse_shell_link_header(self):
# get the flag bits
flags = self.read_unpack_bin(20, 4)
# flags are only the first 7 bits not
for cnt in range(len(flags) - 5):
bit = int(flags[cnt])
if bit:
self.data["Link_Flags"].append(self.flag_hash[cnt][bit])
# File Attributes 4bytes@18h = 24d
# Only a non-zero if "Flag bit 1" above is set to 1
if flags[1] == "1":
file_attrib = self.read_unpack_bin(24, 2)
for cnt in range(len(file_attrib) - 5):
bit = int(file_attrib[cnt])
if bit:
self.data["File_Attributes"].append(self.file_hash[cnt][1])
# Create time 8bytes @ 1ch = 28
creation_time = int(self.reverse_hex(self.read_unpack(28, 8)), 16)
if creation_time != 0:
self.data["Create_Time"] = self.ms_time_to_unix(creation_time)
# Access time 8 bytes@ 0x24 = 36D
access_time = int(self.reverse_hex(self.read_unpack(36, 8)), 16)
if access_time != 0:
self.data["Access_Time"] = self.ms_time_to_unix(access_time)
# Modified Time 8bytes @ 0x2C = 44D
write_time = int(self.reverse_hex(self.read_unpack(44, 8)), 16)
if creation_time != 0:
self.data["Write_Time"] = self.ms_time_to_unix(write_time)
# Target File length starts @ 34h = 52d
length_hex = self.reverse_hex(self.read_unpack(52, 4))
self.data["File_Size"] = int(length_hex, 16)
# Icon File info starts @ 38h = 56d
icon_index_hex = self.reverse_hex(self.read_unpack(56, 4))
self.data["Icon_Index"] = int(icon_index_hex, 16)
# show windows starts @3Ch = 60d
show_command_hex = self.reverse_hex(self.read_unpack(60, 1))
show_command = int(show_command_hex, 16)
self.data["Show_Command"] = self.show_wnd_hash[show_command]
# hot key starts @40h = 64d
hotkey_hex = self.reverse_hex(self.read_unpack(64, 4))
hotkey = int(hotkey_hex, 16)
get_hotkey = self.hot_key_hash(hotkey)
if get_hotkey:
self.data["Hot_Key"] = get_hotkey
else:
log.warning("Unknown hot key: %s" % str(hotkey))
return flags
def parse_link_target_id_list(self, struct_end):
struct_end = self.structure(struct_end, v="t")
return struct_end
def parse_link_info(self, struct_end):
lnk_info = {}
struct_start = struct_end
# struct_end = self.structure(struct_end, v="i")
link_info_header_size = struct_start + 4
link_info_flags = struct_start + 8
volume_id_off = struct_start + 12
local_base_path_off = struct_start + 16
common_network_relative_link_off = struct_start + 20
common_path_suffix_off = struct_start + 24
# Structure length
struct_len_hex = self.reverse_hex(self.read_unpack(struct_start, 4))
struct_len = int(struct_len_hex, 16)
struct_end = struct_start + struct_len
# First offset after struct - Should be 1C under normal circumstances
header_size = self.read_unpack(link_info_header_size, 1)
lnk_info["Link_Info_Header_Size"] = str(int(header_size, 16))
if lnk_info["Link_Info_Header_Size"] >= "36":
# local_base_path_off_unicode = struct_start + 28
# common_path_suffix_off_unicode = struct_start + 32
log.info("Link Info Header Size > 35 bytes. Report this file if possible.")
# File location flags
link_info_flags = self.read_unpack_bin(link_info_flags, 1)
lnk_info["Link_Info_Flags"] = self.link_info_flags_hash[link_info_flags.index("1")][1]
lnk_info["Target_Location"] = "Not Set"
# VolumeID structure
# Random garbage if bit0 is clear in volume flags
if link_info_flags[0] == "1":
lnk_info["Target_Location"] = "Local"
# This is the offset of the local volume table within the
# File Info Location Structure
loc_vol_tab_off_hex = self.reverse_hex(self.read_unpack(volume_id_off, 4))
loc_vol_tab_off = int(loc_vol_tab_off_hex, 16)
# This is the absolute start location of the local volume table
loc_vol_tab_start = loc_vol_tab_off + struct_start
# This is the length of the local volume table
local_vol_len_hex = self.reverse_hex(self.read_unpack(loc_vol_tab_off + struct_start, 4))
local_vol_len = int(local_vol_len_hex, 16)
# We now have enough info to
# Calculate the end of the local volume table.
local_vol_tab_end = loc_vol_tab_start + local_vol_len
# This is the volume type
drive_type_flag = loc_vol_tab_off + struct_start + 4
drive_type_hex = self.reverse_hex(self.read_unpack(drive_type_flag, 4))
drive_type = int(drive_type_hex, 16)
lnk_info["Drive_Type"] = self.drive_type_hash[drive_type]
# Volume Serial Number
drive_serial_number = loc_vol_tab_off + struct_start + 8
drive_serial_number = self.reverse_hex(self.read_unpack(drive_serial_number, 4))
lnk_info["Drive_Serial_Number"] = drive_serial_number
# Get the location, and length of the volume label
# need to add check for VolumeLabelOffsetUnicode
# Kind of messy. Works for now.
vol_label_off = loc_vol_tab_off + struct_start + 12
vol_label_off_hex = self.reverse_hex(self.read_unpack(vol_label_off, 4))[6:]
lnk_info["Volume_Label_Offset"] = vol_label_off_hex
vol_label_start = int(vol_label_off_hex, 16) + loc_vol_tab_start
vol_label_len = local_vol_tab_end - vol_label_start
vol_label = self.read_unpack_ascii(vol_label_start, vol_label_len)
lnk_info["Volume_Label"] = vol_label
# ---------------------------------------------------------------------
# This is the offset of the base path info within the
# File Info structure
# ---------------------------------------------------------------------
base_path_off_hex = self.reverse_hex(self.read_unpack(local_base_path_off, 4))
local_base_path_off = struct_start + int(base_path_off_hex, 16)
# Read base path data up to NULL term
base_path = self.read_null_term(local_base_path_off)
lnk_info["Base_Path"] = base_path
# Network Volume Table
if link_info_flags[1] == "1":
# TODO: test this section!
lnk_info["Target_Location"] = "Network"
net_vol_off_hex = self.reverse_hex(self.read_unpack(common_network_relative_link_off, 4))
common_network_relative_link_off = struct_start + int(net_vol_off_hex, 16)
# net_vol_len_hex = reverse_hex(read_unpack(f, common_network_relative_link_off, 4))
# net_vol_len = struct_start + int(net_vol_len_hex, 16)
# CommonNetworkRelativeLinkFlags
network_relative_link_flags_loc = common_network_relative_link_off + 4
network_relative_link_flags = self.read_unpack_bin(network_relative_link_flags_loc, 4)
lnk_info["Network_Relative_Link_Flags"] = []
for cnt in range(len(network_relative_link_flags) - 30):
bit = int(network_relative_link_flags[cnt])
# grab the description for this bit
if self.nrl_flags_hash[cnt][bit]:
lnk_info["Network_Relative_Link_Flags"].append(self.nrl_flags_hash[cnt][bit])
# Network Share Name
net_share_name_off = common_network_relative_link_off + 8
net_share_name_loc_hex = self.reverse_hex(self.read_unpack(net_share_name_off, 4))
net_share_name_loc = int(net_share_name_loc_hex, 16)
if net_share_name_loc == 20:
net_share_name_loc += common_network_relative_link_off
net_share_name = self.read_null_term(net_share_name_loc)
lnk_info["Network_Share_Name"] = net_share_name
# Mapped Network Drive Info
net_share_mdrive = common_network_relative_link_off + 12
net_share_mdrive_hex = self.reverse_hex(self.read_unpack(net_share_mdrive, 4))
net_share_mdrive = int(net_share_mdrive_hex, 16)
if net_share_mdrive != 0:
net_share_mdrive += common_network_relative_link_off
mapped_drive = self.read_null_term(net_share_mdrive)
lnk_info["Mapped_Drive"] = mapped_drive
else:
log.error("Net Share Name offset should always be 14h")
else:
log.warning("Unknown volume flags")
# Remaining path
rem_path_off_hex = self.reverse_hex(self.read_unpack(common_path_suffix_off, 4))
common_path_suffix_off = struct_start + int(rem_path_off_hex, 16)
rem_data = self.read_null_term(common_path_suffix_off)
lnk_info["Remaining_Path"] = rem_data
self.data["Link_Info"] = lnk_info
return struct_end
def parse_string_data(self, flags, struct_end):
next_loc = struct_end
if flags[2] == "1":
text, next_loc = self.add_info(next_loc)
if text != "0":
self.data["String_Data"]["Name_String"] = text
if flags[3] == "1":
text, next_loc = self.add_info(next_loc)
if text != "0":
self.data["String_Data"]["Relative_Path"] = text
if flags[4] == "1":
text, next_loc = self.add_info(next_loc)
if text != "0":
self.data["String_Data"]["Working_Directory"] = text
if flags[5] == "1":
text, next_loc = self.add_info(next_loc)
if text != "0":
self.data["String_Data"]["Command_Line_Arguments"] = text
if flags[6] == "1":
text, next_loc = self.add_info(next_loc)
if text != "0":
self.data["String_Data"]["Icon_Location"] = text
return struct_end
def parse_console_data_block(self, offset):
cdb = {}
# fill_attributes_loc = offset + 4
# popup_fill_attributes_loc = offset + 6
screen_buffer_size_x_loc = offset + 8
screen_buffer_size_x_hex = self.reverse_hex(self.read_unpack(screen_buffer_size_x_loc, 2))
screen_buffer_size_x = int(screen_buffer_size_x_hex, 16)
cdb["Screen_Buffer_Size_X"] = screen_buffer_size_x
screen_buffer_size_y_loc = offset + 10
screen_buffer_size_y_hex = self.reverse_hex(self.read_unpack(screen_buffer_size_y_loc, 2))
screen_buffer_size_y = int(screen_buffer_size_y_hex, 16)
cdb["Screen_Buffer_Size_Y"] = screen_buffer_size_y
window_size_x_loc = offset + 12
window_size_x_hex = self.reverse_hex(self.read_unpack(window_size_x_loc, 2))
window_size_x = int(window_size_x_hex, 16)
cdb["Window_Size_X"] = window_size_x
window_size_y_loc = offset + 14
window_size_y_hex = self.reverse_hex(self.read_unpack(window_size_y_loc, 2))
window_size_y = int(window_size_y_hex, 16)
cdb["Window_Size_Y"] = window_size_y
window_origin_x_loc = offset + 16
window_origin_x_hex = self.reverse_hex(self.read_unpack(window_origin_x_loc, 2))
window_origin_x = int(window_origin_x_hex, 16)
cdb["Window_Origin_X"] = window_origin_x
window_origin_y_loc = offset + 18
window_origin_y_hex = self.reverse_hex(self.read_unpack(window_origin_y_loc, 2))
window_origin_y = int(window_origin_y_hex, 16)
cdb["Window_Origin_Y"] = window_origin_y
font_size_loc = offset + 28
font_size_hex = self.read_unpack(font_size_loc, 4)
font_size_hex = [self.reverse_hex(font_size_hex[0:4]), self.reverse_hex(font_size_hex[4:8])]
font_size_hex = "".join(font_size_hex)
font_size = int(font_size_hex, 16)
cdb["Font_Size"] = font_size
# font_family_loc = offset + 32
font_weight_loc = offset + 36
font_weight_hex = self.reverse_hex(self.read_unpack(font_weight_loc, 4))
font_weight = int(font_weight_hex, 16)
is_bold = font_weight >= 700
cdb["Is_Bold"] = is_bold
# face_name_loc = offset + 40
cursor_size_loc = offset + 104
cursor_size_hex = self.reverse_hex(self.read_unpack(cursor_size_loc, 4))
cursor_size = int(cursor_size_hex, 16)
if cursor_size <= 25:
cdb["Cursor_Size"] = "Small"
elif 25 < cursor_size <= 50:
cdb["Cursor_Size"] = "Normal"
elif 50 < cursor_size <= 100:
cdb["Cursor_Size"] = "Large"
full_screen_loc = offset + 108
full_screen_hex = self.reverse_hex(self.read_unpack(full_screen_loc, 4))
full_screen = int(full_screen_hex, 16)
is_full_screen = full_screen > 0
cdb["Is_Full_Screen"] = is_full_screen
quick_edit_loc = offset + 112
quick_edit_hex = self.reverse_hex(self.read_unpack(quick_edit_loc, 4))
quick_edit = int(quick_edit_hex, 16)
is_quick_edit = quick_edit > 0
cdb["Is_Quick_Edit"] = is_quick_edit
insert_mode_loc = offset + 116
insert_mode_hex = self.reverse_hex(self.read_unpack(insert_mode_loc, 4))
insert_mode = int(insert_mode_hex, 16)
is_insert_mode = insert_mode > 0
cdb["Is_Insert_Mode"] = is_insert_mode
auto_position_loc = offset + 120
auto_position_hex = self.reverse_hex(self.read_unpack(auto_position_loc, 4))
auto_position = int(auto_position_hex, 16)
is_auto_position = auto_position > 0
cdb["Is_Auto_Position"] = is_auto_position
history_buffer_size_loc = offset + 124
history_buffer_size_hex = self.reverse_hex(self.read_unpack(history_buffer_size_loc, 4))
history_buffer_size = int(history_buffer_size_hex, 16)
cdb["History_Buffer_Size"] = history_buffer_size
history_buffer_count_loc = offset + 128
history_buffer_count_hex = self.reverse_hex(self.read_unpack(history_buffer_count_loc, 4))
history_buffer_count = int(history_buffer_count_hex, 16)
cdb["History_Buffer_Count"] = history_buffer_count
history_nodup_loc = offset + 132
history_nodup_hex = self.reverse_hex(self.read_unpack(history_nodup_loc, 4))
history_nodup = int(history_nodup_hex, 16)
is_history_nodup = history_nodup > 0
cdb["Is_History_Nodup"] = is_history_nodup
self.data["Extra_Data"]["Console_Data_Block"] = cdb
self.set_end_offset(offset)
def parse_console_fe_data_block(self, offset):
self.data["Extra_Data"]["Console_FE_Data_Block"] = {}
self.set_end_offset(offset)
def parse_darwin_data_block(self, offset):
self.data["Extra_Data"]["Darwin_Data_Block"] = {}
self.set_end_offset(offset)
def parse_environment_variable_data_block(self, offset):
evdb = {}
target_ansi_loc = offset + 4
# target_unicode_loc = offset + 264 # not complete
target_ansi = self.read_null_term(target_ansi_loc)
evdb["Target"] = target_ansi
self.data["Extra_Data"]["Environment_Variable_Data_Block"] = evdb
self.set_end_offset(offset)
def parse_icon_environment_data_block(self, offset):
iedb = {}
target_ansi_loc = offset + 4
# target_unicode_loc = offset + 264 # not complete
target_ansi = self.read_null_term(target_ansi_loc)
iedb["Target"] = target_ansi
self.data["Extra_Data"]["Icon_Environment_Data_Block"] = iedb
self.set_end_offset(offset)
def parse_known_folder_data_block(self, offset):
kfdb = {}
known_folder_data_block_loc = offset + 4
known_folder_id = self.read_unpack(known_folder_data_block_loc, 16)
fields = [self.reverse_hex(known_folder_id[0:8]), self.reverse_hex(known_folder_id[8:12]),
self.reverse_hex(known_folder_id[12:16]), known_folder_id[16:20].decode("utf8"),
known_folder_id[20:32].decode("utf8")]
known_folder_guid = "-".join(fields)
known_folder_name = self.known_folder_name_hash(known_folder_guid)
kfdb["Known_Folder_Name"] = known_folder_name
kfdb["Known_Folder_GUID"] = known_folder_guid
self.data["Extra_Data"]["Known_Folder_Data_Block"] = kfdb
self.set_end_offset(offset)
def parse_property_store_data_block(self, offset):
self.data["Extra_Data"]["Property_Store_Data_Block"] = {}
self.set_end_offset(offset)
def parse_shim_data_block(self, offset):
self.data["Extra_Data"]["Shim_Data_Block"] = {}
self.set_end_offset(offset)
def parse_special_folder_data_block(self, offset):
sfdb = {}
special_folder_id_loc = offset + 4
special_folder_id_hex = self.reverse_hex(self.read_unpack(special_folder_id_loc, 4))
special_folder_id = int(special_folder_id_hex, 16)
sfdb["Special_Folder_Id"] = special_folder_id
self.data["Extra_Data"]["Special_Folder_Data_Block"] = sfdb
self.set_end_offset(offset)
def parse_tracker_data_block(self, offset):
tdb = {}
# MachineID
machine_id_loc = offset + 12
machine_id = self.read_null_term(machine_id_loc)
tdb["Machine_Id"] = machine_id
# NewObjectID MAC Address
mac_address_loc = offset + 54
mac_address = self.split_count(self.read_unpack(mac_address_loc, 6), 2)
tdb["Mac_Address"] = mac_address
# Volume Droid
volume_droid_loc = offset + 28
volume_droid = self.read_unpack(volume_droid_loc, 16)
fields = [self.reverse_hex(volume_droid[0:8]), self.reverse_hex(volume_droid[8:12]),
self.reverse_hex(volume_droid[12:16]), volume_droid[16:20].decode("utf8"),
volume_droid[20:32].decode("utf8")]
volume_droid = "-".join(fields)
tdb["Volume_Droid"] = volume_droid
# Volume Droid Birth
# volume_droid_birth_loc = offset + 60
volume_droid_birth = self.read_unpack(volume_droid_loc, 16)
fields = [self.reverse_hex(volume_droid_birth[0:8]), self.reverse_hex(volume_droid_birth[8:12]),
self.reverse_hex(volume_droid_birth[12:16]), volume_droid_birth[16:20].decode("utf8"),
volume_droid_birth[20:32].decode("utf8")]
volume_droid_birth = "-".join(fields)
tdb["Volume_Droid_Birth"] = volume_droid_birth
# File Droid
file_droid_loc = offset + 44
file_droid = self.read_unpack(file_droid_loc, 16)
fields = [self.reverse_hex(file_droid[0:8]), self.reverse_hex(file_droid[8:12]),
self.reverse_hex(file_droid[12:16]), file_droid[16:20].decode("utf8"),
file_droid[20:32].decode("utf8")]
file_droid = "-".join(fields)
tdb["File_Droid"] = file_droid
# Creation time
file_droid_time = "".join(fields)
timestamp = int((file_droid_time[13:16] + file_droid_time[8:12] + file_droid_time[0:8]), 16)
creation = datetime.utcfromtimestamp((timestamp - 0x01b21dd213814000) * 100 / 1e9)
tdb["Creation"] = creation.isoformat(sep=" ")
# File Droid Birth
file_droid_birth_loc = offset + 76
file_droid_birth = self.read_unpack(file_droid_birth_loc, 16)
fields = [self.reverse_hex(file_droid_birth[0:8]), self.reverse_hex(file_droid_birth[8:12]),
self.reverse_hex(file_droid_birth[12:16]), file_droid_birth[16:20].decode("utf8"),
file_droid_birth[20:32].decode("utf8")]
file_droid_birth = "-".join(fields)
tdb["File_Droid_Birth"] = file_droid_birth
self.data["Extra_Data"]["Tracker_Data_Block"] = tdb
self.set_end_offset(offset)
def parse_vista_and_above_id_list_data_block(self, offset):
self.data["Extra_Data"]["Vista_And_Above_Id_List_data_Block"] = {}
self.set_end_offset(offset)
def parse_extra_data(self):
# Map the file
haystack = mmap(self.lnk_obj.fileno(), length=0, access=ACCESS_READ)
# Find ExtraDataBlock's using their signatures documented by
# https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-SHLLINK/[MS-SHLLINK]-131114.pdf
# Sections 2.5.x (BlockSignature)
console_data_block_offset = haystack.find(b"\x02\x00\x00\xA0")
console_fe_data_block_offset = haystack.find(b"\x04\x00\x00\xA0")
darwin_data_block_offset = haystack.find(b"\x06\x00\x00\xA0")
environment_variable_data_block_offset = haystack.find(b"\x01\x00\x00\xA0")
icon_environment_data_block_offset = haystack.find(b"\x07\x00\x00\xA0")
known_folder_data_block_offset = haystack.find(b"\x0B\x00\x00\xA0")
property_store_data_block_offset = haystack.find(b"\x09\x00\x00\xA0")
shim_data_block_offset = haystack.find(b"\x08\x00\x00\xA0")
special_folder_data_block_offset = haystack.find(b"\x05\x00\x00\xA0")
tracker_data_block_offset = haystack.find(b"\x03\x00\x00\xA0")
vista_and_above_id_list_data_block_offset = haystack.find(b"\x0C\x00\x00\xA0")
if console_data_block_offset > 0:
log.info("Found ConsoleDataBlock signature, report this hash if possible.")
self.parse_console_data_block(console_data_block_offset)
if console_fe_data_block_offset > 0:
log.info("Found ConsoleFEDataBlock, report this hash if possible.")
self.parse_console_fe_data_block(console_fe_data_block_offset)
if darwin_data_block_offset > 0:
log.info("Found DarwinDataBlock, report this hash if possible.")
self.parse_darwin_data_block(darwin_data_block_offset)
if environment_variable_data_block_offset > 0:
log.info("Found EnvironmentVariableDataBlock, report this hash if possible")
self.parse_environment_variable_data_block(environment_variable_data_block_offset)
if icon_environment_data_block_offset > 0:
log.info("Found IconEnvironmentDataBlock, report this hash if possible")
self.parse_icon_environment_data_block(icon_environment_data_block_offset)
if known_folder_data_block_offset > 0:
self.parse_known_folder_data_block(known_folder_data_block_offset)
if property_store_data_block_offset > 0:
log.info("Found PropertyStoryDataBlock, report this hash if possible")
self.parse_property_store_data_block(property_store_data_block_offset)
if shim_data_block_offset > 0:
log.info("Found ShimDataBlock, report this hash if possible")
self.parse_shim_data_block(shim_data_block_offset)
if special_folder_data_block_offset > 0:
self.parse_special_folder_data_block(special_folder_data_block_offset)
if tracker_data_block_offset > 0:
self.parse_tracker_data_block(tracker_data_block_offset)
if vista_and_above_id_list_data_block_offset > 0:
log.info("Found VistaAndAboveIDListDataBlock, report this hash if possible")
self.parse_vista_and_above_id_list_data_block(vista_and_above_id_list_data_block_offset)
haystack.close()
def parse(self):
self.lnk_open()
if not self.assert_lnk_signature():
self.lnk_close()
return {}
struct_end = 76
flags = self.parse_shell_link_header()
if "HasLinkTargetIDList" in self.data["Link_Flags"]:
struct_end = self.parse_link_target_id_list(struct_end)
if "HasLinkInfo" in self.data["Link_Flags"]:
struct_end = self.parse_link_info(struct_end)
string_flags = ["HasName", "HasRelativePath", "HasWorkingDir", "HasArguments", "HasIconLocation"]
if any(x in self.data["Link_Flags"] for x in string_flags):
self.parse_string_data(flags, struct_end)
self.parse_extra_data()
# Verify the end of the lnk
try:
self.lnk_obj.seek(self.end_offset)
end_block = unpack("4s", self.lnk_obj.read(4))[0]
except struct_error:
log.warning("End of file reached before LNK terminating block")
else:
# Verify the termination block
if end_block == b"\x00\x00\x00\x00":
self.end_offset += 4
else:
log.warning("Parsing did not find the LNK terminating block")
self.lnk_obj.seek(0, 2)
file_end = self.lnk_obj.tell()
# Check for non-LNK related data at the end of the file, grab it out if there is any
if file_end > self.end_offset:
self.lnk_obj.seek(self.end_offset)
data_size = file_end - self.end_offset
self.data["Data_After_EOF"] = {
"Size": data_size,
"Data": b64encode(self.lnk_obj.read(data_size)).decode("utf8"),
"Lnk_End": self.end_offset,
"File_End": file_end,
}
self.lnk_close()
return self.data