trying to make a automatic virus checking tool with HTTP GET AND POST

**Anddos** · 04-20-2009

ive formatted the message like this
char Con[32];
sprintf(Con,"Content-Length: %d\r\n",ToRead); //264 is outputted but not sure if thats correct , it only loops once and breaks in the Readfile loop, 124 kb is the correct size when you right click on the file..

Code:

sprintf(post,"%s%s%s%s",
			         "POST / HTTP/1.1\r\n" 
                     "Host: scanner.novirusthanks.org\r\n"
					 "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n"
					 "Accept-Language: en-gb,en;q=0.5\r\n"
					 "Accept-Encoding: gzip,deflate\r\n"
					 "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7\r\n"
					 "Keep-Alive: 300\r\n"
					 "Connection: keep-alive\r\n"
					 "Referer: http://scanner.novirusthanks.org\r\n"
                     "Content-Type: multipart/form-data; boundary=---------------------------24464570528145\r\n",
					 Con,
					 Dis,
                     "Content-Type: application/octet-stream\r\n\r\n");

**bithub** · 04-20-2009

If the file is 124kb, then you should be reading about 124,000 bytes total. If you are only reading 264, then there is a problem somewhere in your code.

**Anddos** · 04-21-2009

i thought you was going to paste a fixed version :/

**bithub** · 04-21-2009

- ReadFile() takes in the size of the buffer. You are passing in an uninitialized DWORD.
- You are only calling ReadFile() once. What happens if your file size is greater than 1024?
- You are calling strlen on the data you read from the buffer. This is data read from a file; it is not a string!

Code:

DWORD fileSize = GetFileSize(Upload, NULL);
// Set Content-Length equal to fileSize

// Generate the header
char* post = ...
send(sock,post,strlen(post),0);

DWORD bufferSize = 1024;
DWORD bytesRead;
BOOL retVal;
char* buffer = new char[bufferSize];
while(1)
{
    retVal = ReadFile(Upload, buffer, bufferSize, &bytesRead, NULL);
    if(retVal == TRUE && bytesRead > 0)
        send(sock,buffer,bytesRead,0);
    else
        break;
}
delete [] buffer;

**Anddos** · 04-21-2009

yes but ive been reading the content is converted to base64 is this true?
i cant get the content length right for the exe Buffer ,this is what wireshark packetsniffer shows

Code:

   1.
      POST /index.php HTTP/1.1
   2.
       
   3.
      Host: scanner.novirusthanks.org
   4.
       
   5.
      User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.9.0.8) Gecko/2009032609 Firefox/3.0.8 (.NET CLR 3.5.30729)
   6.
       
   7.
      Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
   8.
       
   9.
      Accept-Language: en-gb,en;q=0.5
  10.
       
  11.
      Accept-Encoding: gzip,deflate
  12.
       
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      Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
  14.
       
  15.
      Keep-Alive: 300
  16.
       
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      Connection: keep-alive
  18.
       
  19.
      Referer: http://scanner.novirusthanks.org/index.php
  20.
       
  21.
      Content-Type: multipart/form-data; boundary=---------------------------265001916915724
  22.
       
  23.
      Content-Length: 42297
  24.
       
  25.
       
  26.
       
  27.
      -----------------------------265001916915724
  28.
       
  29.
      Content-Disposition: form-data; name="upfile"; filename="xor.exe"
  30.
       
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      Content-Type: application/octet-stream
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      . .U.n.a.b.l.e. .t.o. .d.i.s.p.l.a.y. .R.T.C. .M.e.s.s.a.g.e.............................Stack corrupted near unknown variable...............Stack area around _alloca memory reserved by this function is corrupted
 132.
      ................%s%s%s%s....> ..%s%s%p%s%ld%s%d%s.......Stack area around _alloca memory reserved by this function is corrupted.................
 133.
      Address: 0x....
 134.
      Size: .....
 135.
      Allocation number within this function: ...........
 136.
      Data: <....wsprintfA...user32.dll......%.2X ...A variable is being used without being initialized..............Stack around _alloca corrupted..........Local variable used before initialization...........Stack memory corruption.....Cast to smaller type causing loss of data...........Stack pointer corruption..........A...A...A.p.A.H.A........................._.c.o.n.t.r.o.l.f.p._.s.(.(.(.v.o.i.d. .*.).0.).,. .0.x.0.0.0.1.0.0.0.0.,. .0.x.0.0.0.3.0.0.0.0.)......................._.s.e.t.d.e.f.a.u.l.t.p.r.e.c.i.s.i.o.n.................f.:.\.d.d.\.v.c.t.o.o.l.s.\.c.r.t._.b.l.d.\.s.e.l.f._.x.8.6.\.c.r.t.\.s.r.c.\.i.n.t.e.l.\.f.p.8...c.........................MSPDB80.DLL.....r...PDBOpenValidate5....EnvironmentDirectory........SOFTWARE\Microsoft\VisualStudio\9.0\Setup\VS............RegCloseKey.....RegQueryValueExA....RegOpenKeyExA...ADVAPI32.DLL....................................................................................................................................................................................................................................................................................................................................................................RSDS.{.^.P.N.._.*K......C:\Users\Anddos\Documents\coding\xor\Debug\xor.pdb........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................A...........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................A.....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................@...........s.A...................A......UA.................".......$.A.......A................................. VA.".......l.A.................................PVA.".........A......................................................*A..+A...........................A...A..........................2A..2A..............................;A..........................>A..>A.....................................................................................................................................................................................................................................................................................................................................................................................................................<[email protected].....................................................................................................................................................................................................................................................................................................................................................................................................................................................................t...........v.......................(... ...............................<.......x...........B...........................4...$...................................t...d...R...F...0...................................f...^...H...............................................................................L...............|...........N..............."...D...........$...B...`...............................................................b...P...F...>...0...&...........................................................................|...n...f...V...H...6...$...........................................................................h...................................................s.......................................................................4...$...................................t...d...R...F...0...................................f...^...H...............................................................................L...............|...........N..............."...D...........$...B...`...............................................................b...P...F...>...0...&...........................................................................|...n...f...V...H...6...$...........................................................................h...................................................s.........................................................................MessageBoxA.USER32.dll....strlen....sprintf...__CxxFrameHandler3..MSVCR90D.dll..\._CRT_RTC_INITW..m._configthreadlocale.
 137.
      .__setusermatherr..2._adjust_fdiv....__p__commode....__p__fmode...._encode_pointer...__set_app_type..D._amsg_exit....__getmainargs..._exit..._XcptFilter.[._cexit....exit....__initenv.r._CrtSetCheckCount.a._CrtDbgReportW..?._initterm.@._initterm_e..._crt_debugger_hook..G.?terminate@@YAXXZ.p._controlfp_s..E._invoke_watson..$._unlock...__dllonexit..._lock.X._onexit..._decode_pointer..._except_handler4_common...??6?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV01@P6AAAV01@AAV01@@Z@Z..@.?cout@std@@3V?$basic_ostream@DU?$char_traits@D@std@@@[email protected].?endl@std@@YAAAV?$basic_ostream@DU?$char_traits@D@std@@@1@AAV21@@Z..C.?setstate@?$basic_ios@DU?$char_traits@D@std@@@std@@QAEXH_N@Z...
 138.
      ?width@ios_base@std@@[email protected].?sputn@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEHPBDH@Z....?eq_int_type@?$char_traits@D@std@@[email protected].?eof@?$char_traits@D@std@@SAHXZ.s.?sputc@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEHD@Z...?rdbuf@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEPAV?$basic_streambuf@DU?$char_traits@D@std@@@2@XZ....?fill@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEDXZ...?flags@ios_base@std@@QBEHXZ.
 139.
       
 140.
      ?width@ios_base@std@@QBEHXZ.>
 141.
      ?length@?$char_traits@D@std@@SAIPBD@Z...?flush@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEAAV12@XZ...?tie@?$basic_ios@DU?$char_traits@D@std@@@std@@QBEPAV?$basic_ostream@DU?$char_traits@D@std@@@[email protected].?good@ios_base@std@@QBE_NXZ.
 142.
      .?_Osfx@?$basic_ostream@DU?$char_traits@D@std@@@std@@QAEXXZ....?uncaught_exception@std@@YA_NXZ...?_Lock@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEXXZ..g.?_Unlock@?$basic_streambuf@DU?$char_traits@D@std@@@std@@QAEXXZ..MSVCP90D.dll..WS2_32.dll..).InterlockedExchange.V.Sleep.&.InterlockedCompareExchange..^.TerminateProcess..B.GetCurrentProcess.n.UnhandledExceptionFilter..J.SetUnhandledExceptionFilter.9.IsDebuggerPresent...RaiseException..x.DebugBreak....WideCharToMultiByte.u.MultiByteToWideChar...lstrlenA....GetProcAddress..R.LoadLibraryA....QueryPerformanceCounter...GetTickCount..F.GetCurrentThreadId..C.GetCurrentProcessId...GetSystemTimeAsFileTime...HeapFree....HeapAlloc...GetProcessHeap..~.GetModuleFileNameW....VirtualQuery....FreeLibrary.KERNEL32.dll..............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................0.......................H...p..........................................................................................................................................................................................................................................................................................................<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 143.
       
 144.
      <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
 145.
       
 146.
        <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
 147.
       
 148.
          <security>
 149.
       
 150.
            <requestedPrivileges>
 151.
       
 152.
              <requestedExecutionLevel level="asInvoker" uiAccess="false"></requestedExecutionLevel>
 153.
       
 154.
            </requestedPrivileges>
 155.
       
 156.
          </security>
 157.
       
 158.
        </trustInfo>
 159.
       
 160.
        <dependency>
 161.
       
 162.
          <dependentAssembly>
 163.
       
 164.
            <assemblyIdentity type="win32" name="Microsoft.VC90.DebugCRT" version="9.0.21022.8" processorArchitecture="x86" publicKeyToken="1fc8b3b9a1e18e3b"></assemblyIdentity>
 165.
       
 166.
          </dependentAssembly>
 167.
       
 168.
        </dependency>
 169.
       
 170.
      </assembly>................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................./5{5.5.5.5.5.5.6
 171.
      6.6+61676H6Y6c6m6w6.6.6.6.6.6.6.6.6.6.6.7.7"7.7
 172.
      8.8/8;8G8S8`8r8~8.8.8.9.929A9.9.9.9.9.:$:0:<:H:T:.;.; <B<b<.<.<<=^=.=.=.=.>:>.>.>.>.>$?f?.?.?.?.?... .. ....0(0V1.1.1.1.1
 173.
      2&2.2.2.2.3.3 414.4.4.4,52585B5b7u7.7.7.7.7.7.7.7.7.7.8
 174.
      8.8.8)81878E8P8.8.8.8.8.8.8.8.8.8.8.8(9-9?9|9.9.9.9.9.9.9.9.:.:.:.:*:4:<:H:P:f:l:r:z:.:.:.:.:.:.:.:.:.:.:.:.:.:.;%;.;5;;;D;P;.<.<.=.=.=.=.=!=(=/=6===D=K=S=[=c=o=x=}=.=.=.=.=.=.=.=.=.=.=.=.=R>.>.>.>.>@?G?b?.?.?.0......90Z0.0.0.0$1U1z1.182=2O2.2.3.3b3.3.3.3L4X4t4z4.4.4.4.4.4.4.4.4.4.4.4.5.5#5R5.5.6\6g6.6.6.7.7.7.7.7.7.7.7.8.8%8A8Q8X8.8.8.8
 175.
      9.9.9.9.9.9.9.9.9.9.:.:(:-:?:S:Z:p:.:.:.:.:.:.:.:.:.:.;.;.;.;.;.;.;.;.;.<.<$<4<x<.<.<.<.<.<.<.>
 176.
      >.>8>X?^[email protected]\0i0s0{0.0.0.0.1.142;2,373O3V3]3p3.3.3.3.3.3.4e4z4.4.4.4n5t5z5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.5.6
 177.
      6.6.6.6"6(6.646:6@6F6L6R6X6^6d6j6p6v6|6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.6.P......
 178.
      6=6m6...p.. ....1.4.5h:l:.=.=.=.=.=.=......<....2.2.2 2$2.7.:.= =(=D=L=p=|=.=.=.=.=.>.>$>(>H>d>h>...........080........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
 179.
       
 180.
      -----------------------------265001916915724
 181.
       
 182.
      Content-Disposition: form-data; name="submit"
 183.
       
 184.
       
 185.
       
 186.
      Submit File
 187.
       
 188.
      -----------------------------265001916915724--

**bithub** · 04-21-2009

yes but ive been reading the content is converted to base64 is this true?

No.

i cant get the content length right for the exe Buffer

Post your code which gets the content length.

**Anddos** · 04-21-2009

i am trying it now with the GetFileSize for content length...

Thread: trying to make a automatic virus checking tool with HTTP GET AND POST

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