├── .gitattributes ├── .gitignore ├── BloatedHammer.sln ├── BloatedHammer ├── BloatedHammer.vcxproj ├── BloatedHammer.vcxproj.filters └── bloat.cpp ├── LICENSE.txt └── README.md /.gitattributes: -------------------------------------------------------------------------------- 1 | ############################################################################### 2 | # Set default behavior to automatically normalize line endings. 3 | ############################################################################### 4 | * text=auto 5 | 6 | ############################################################################### 7 | # Set default behavior for command prompt diff. 8 | # 9 | # This is need for earlier builds of msysgit that does not have it on by 10 | # default for csharp files. 11 | # Note: This is only used by command line 12 | ############################################################################### 13 | #*.cs diff=csharp 14 | 15 | ############################################################################### 16 | # Set the merge driver for project and solution files 17 | # 18 | # Merging from the command prompt will add diff markers to the files if there 19 | # are conflicts (Merging from VS is not affected by the settings below, in VS 20 | # the diff markers are never inserted). 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auto-generated XML schema 363 | FodyWeavers.xsd -------------------------------------------------------------------------------- /BloatedHammer.sln: -------------------------------------------------------------------------------- 1 |  2 | Microsoft Visual Studio Solution File, Format Version 12.00 3 | # Visual Studio Version 17 4 | VisualStudioVersion = 17.2.32630.192 5 | MinimumVisualStudioVersion = 10.0.40219.1 6 | Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "BloatedHammer", "BloatedHammer\BloatedHammer.vcxproj", "{37ECBB41-2B1B-4E69-AD9C-53CFCB1B9CC4}" 7 | EndProject 8 | Global 9 | GlobalSection(SolutionConfigurationPlatforms) = preSolution 10 | Debug|x64 = Debug|x64 11 | Debug|x86 = Debug|x86 12 | Release|x64 = Release|x64 13 | Release|x86 = Release|x86 14 | EndGlobalSection 15 | GlobalSection(ProjectConfigurationPlatforms) = postSolution 16 | {37ECBB41-2B1B-4E69-AD9C-53CFCB1B9CC4}.Debug|x64.ActiveCfg = Debug|x64 17 | {37ECBB41-2B1B-4E69-AD9C-53CFCB1B9CC4}.Debug|x64.Build.0 = Debug|x64 18 | {37ECBB41-2B1B-4E69-AD9C-53CFCB1B9CC4}.Debug|x86.ActiveCfg = Debug|Win32 19 | {37ECBB41-2B1B-4E69-AD9C-53CFCB1B9CC4}.Debug|x86.Build.0 = Debug|Win32 20 | {37ECBB41-2B1B-4E69-AD9C-53CFCB1B9CC4}.Release|x64.ActiveCfg = Release|x64 21 | {37ECBB41-2B1B-4E69-AD9C-53CFCB1B9CC4}.Release|x64.Build.0 = Release|x64 22 | {37ECBB41-2B1B-4E69-AD9C-53CFCB1B9CC4}.Release|x86.ActiveCfg = Release|Win32 23 | {37ECBB41-2B1B-4E69-AD9C-53CFCB1B9CC4}.Release|x86.Build.0 = Release|Win32 24 | EndGlobalSection 25 | GlobalSection(SolutionProperties) = preSolution 26 | HideSolutionNode = FALSE 27 | EndGlobalSection 28 | GlobalSection(ExtensibilityGlobals) = postSolution 29 | SolutionGuid = {9BA16C06-9820-46CB-9BD1-95D1FEF8EFB8} 30 | EndGlobalSection 31 | EndGlobal 32 | -------------------------------------------------------------------------------- /BloatedHammer/BloatedHammer.vcxproj: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Debug 6 | Win32 7 | 8 | 9 | Release 10 | Win32 11 | 12 | 13 | Debug 14 | x64 15 | 16 | 17 | Release 18 | x64 19 | 20 | 21 | 22 | 16.0 23 | Win32Proj 24 | {37ecbb41-2b1b-4e69-ad9c-53cfcb1b9cc4} 25 | BloatedHammer 26 | 10.0 27 | 28 | 29 | 30 | Application 31 | true 32 | v143 33 | Unicode 34 | 35 | 36 | Application 37 | false 38 | v143 39 | true 40 | Unicode 41 | 42 | 43 | Application 44 | true 45 | v143 46 | Unicode 47 | 48 | 49 | Application 50 | false 51 | v143 52 | true 53 | Unicode 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 64 | 65 | 66 | 67 | 68 | 69 | 70 | 71 | 72 | 73 | 74 | 75 | Level3 76 | true 77 | WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions) 78 | true 79 | 80 | 81 | Console 82 | true 83 | 84 | 85 | 86 | 87 | Level3 88 | true 89 | true 90 | true 91 | WIN32;NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 92 | true 93 | 94 | 95 | Console 96 | true 97 | true 98 | true 99 | 100 | 101 | 102 | 103 | Level3 104 | true 105 | _DEBUG;_CONSOLE;%(PreprocessorDefinitions) 106 | true 107 | stdcpp20 108 | 109 | 110 | Console 111 | true 112 | 113 | 114 | 115 | 116 | Level3 117 | true 118 | true 119 | true 120 | NDEBUG;_CONSOLE;%(PreprocessorDefinitions) 121 | true 122 | stdcpp20 123 | 124 | 125 | Console 126 | true 127 | true 128 | false 129 | 130 | 131 | 132 | 133 | 134 | 135 | 136 | 137 | -------------------------------------------------------------------------------- /BloatedHammer/BloatedHammer.vcxproj.filters: -------------------------------------------------------------------------------- 1 |  2 | 3 | 4 | 5 | {4FC737F1-C7A5-4376-A066-2A32D752A2FF} 6 | cpp;c;cc;cxx;c++;cppm;ixx;def;odl;idl;hpj;bat;asm;asmx 7 | 8 | 9 | {93995380-89BD-4b04-88EB-625FBE52EBFB} 10 | h;hh;hpp;hxx;h++;hm;inl;inc;ipp;xsd 11 | 12 | 13 | {67DA6AB6-F800-4c08-8B7A-83BB121AAD01} 14 | rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav;mfcribbon-ms 15 | 16 | 17 | 18 | 19 | Source Files 20 | 21 | 22 | -------------------------------------------------------------------------------- /BloatedHammer/bloat.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | 4 | /*++ 5 | Routine Description: 6 | 7 | This function is called as a user-mode routine 8 | normally during the start of execution. It's job 9 | is to call your function to was the time of 10 | sandbox, by api hammering without loop... 11 | 12 | Arguments: 13 | 14 | size - The number of times you want your specific 15 | function to be called. Ideally not too big 16 | as the compiler will complain. 17 | Fn - A function capturing a size_t value. This 18 | will be called size times, with an increasing 19 | value. (implicit template instantiation) 20 | 21 | Comments: 22 | - We're essentially unfolding the loop. This generates 23 | a lot of garbage code in order to evade sandbox by a 24 | timeout. 25 | - Requires on std:c++20 and possibly /O2 26 | - Size has to be smaller than 256 if compiling on clang 27 | https://reviews.llvm.org/rG9c9974c3ccb6468cc83f759240293538cf123fcd 28 | 29 | 30 | Return Value: 31 | 32 | None. 33 | --*/ 34 | template 35 | auto bloat(Fn fn) -> void 36 | { 37 | [&] (std::index_sequence) { 38 | (((fn(Indexes))), ...); 39 | }(std::make_index_sequence{}); 40 | } 41 | 42 | /*++ 43 | Inspirations: 44 | - https://unit42.paloaltonetworks.com/api-hammering-malware-families/ 45 | - https://www.joesecurity.org/blog/498839998833561473 46 | - https://www.joesecurity.org/blog/3660886847485093803 47 | 48 | Downsides: 49 | - Bloated file size as the loops are unrolled. 50 | - Requires C++20 (possible with C++17 but not as clean) 51 | --*/ 52 | auto main() -> int 53 | { 54 | 55 | bloat<512>([&](size_t val) { 56 | // Do whatever here to waste time like printf 57 | // or use a bunch of Windows APIs 58 | auto mod = val % 4; 59 | switch (mod) 60 | { 61 | case 0: 62 | // Nested will change CFG and take more time 63 | bloat<256>([&](size_t val) { 64 | printf("Case 0 recursive.\n"); 65 | }); 66 | case 1: 67 | bloat<32>([&](size_t val) { 68 | printf("Case 1 recursive.\n"); 69 | // Nested^2 is also good 70 | bloat<32>([&](size_t val) { 71 | printf("Case 1 double recursive.\n"); 72 | bloat<32>([&](size_t val) { 73 | printf("Case 1 triple recursive.\n"); 74 | }); 75 | }); 76 | }); 77 | case 2: 78 | bloat<256>([&](size_t val) { 79 | printf("Case 2 recursive.\n"); 80 | }); 81 | 82 | case 3: 83 | bloat<256>([&](size_t val) { 84 | printf("Case 3 recursive.\n"); 85 | }); 86 | 87 | default: 88 | break; 89 | } 90 | }); 91 | } -------------------------------------------------------------------------------- /LICENSE.txt: -------------------------------------------------------------------------------- 1 | MIT License 2 | 3 | Copyright (c) [year] [fullname] 4 | 5 | Permission is hereby granted, free of charge, to any person obtaining a copy 6 | of this software and associated documentation files (the "Software"), to deal 7 | in the Software without restriction, including without limitation the rights 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 9 | copies of the Software, and to permit persons to whom the Software is 10 | furnished to do so, subject to the following conditions: 11 | 12 | The above copyright notice and this permission notice shall be included in all 13 | copies or substantial portions of the Software. 14 | 15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 21 | SOFTWARE. 22 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # BloatedHammer 2 | API Hammering with C++20 by folding (avoiding loops) 3 | 4 | This is a PoC to apply modern C++ techniques to compile time API Hammering. 5 | 6 | ## Why? 7 | - Using a pre-compliation script in order to obfuscate is difficult to develop alongside. 8 | - Having a for loop is lame 9 | - I was interested in this technique having read the [Unit42 report](https://unit42.paloaltonetworks.com/api-hammering-malware-families/) and thought about the best way to replicate it. 10 | 11 | 12 | How to use 13 | --- 14 | ``` 15 | bloat([&](size_t val){ 16 | // Our lambda function will capture val which is just an incrementing index value 17 | // Such as CreateFile or registry stuff anything to waste time 18 | 19 | bloat([&](size_t val){ 20 | // You can embed like nested loops, but it'll all be unfolded 21 | 22 | }); 23 | }); 24 | ``` 25 | The bigger the size, the longer it'll take to compile, and execute. 26 | 27 | 28 | 29 | ## Next Steps? 30 | Adding an element of randomness 31 | 32 | References 33 | --- 34 | https://unit42.paloaltonetworks.com/api-hammering-malware-families/ 35 | 36 | https://www.joesecurity.org/blog/498839998833561473 37 | 38 | https://www.joesecurity.org/blog/3660886847485093803 39 | --------------------------------------------------------------------------------