├── .gitignore ├── LICENSE ├── Makefile ├── README.md ├── dist └── handle_finder.cna ├── img ├── .gitkeep └── enumhandles.PNG └── src ├── beacon.h ├── bofdefs.h ├── main.c └── native.h /.gitignore: -------------------------------------------------------------------------------- 1 | *.o -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | PROJECT = handle_finder 2 | 3 | CCX64 := x86_64-w64-mingw32-gcc 4 | CCX86 := i686-w64-mingw32-gcc 5 | 6 | CFLAGS := -Wall -Werror -Os -s -fPIC 7 | 8 | .DEFAULT: all 9 | .PHONY: all 10 | all: bof 11 | 12 | .PHONY: bof 13 | bof: $(PROJECT).x64.o $(PROJECT).x86.o 14 | 15 | $(PROJECT).x64.o: src/main.c 16 | $(CCX64) -c $< -o dist/$@ $(CFLAGS) -DBOF 17 | 18 | $(PROJECT).x86.o: src/main.c 19 | $(CCX86) -c $< -o dist/$@ $(CFLAGS) -DBOF 20 | 21 | .PHONY: clean 22 | clean: 23 | rm -f dist/$(PROJECT)x64.o 24 | rm -f dist/$(PROJECT)x86.o 25 | 26 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # enumhandles_BOF 2 | This BOF can be used to identify processes that hold handles to a given file. This can be useful to identify which process is locking a file on disk. 3 | 4 | # Usage 5 | ![alt text](img/enumhandles.PNG) 6 | 7 | # Limitations 8 | I have found that x86 beacons will crash sometimes when attempting to enumerate handles associated with an x64 image. For example, running `enumhandles c:\windows\sysnative\svchost.exe` may cause a crash. 9 | 10 | # Credits 11 | All credit for this technique belongs to [Grzegorz Tworek](https://x.com/0gtweet): 12 | 13 | ![image](https://github.com/user-attachments/assets/848d6522-ead8-4ff7-b91b-8554c445f8dc) 14 | 15 | The specific tweet regarding this technique can be found [here](https://x.com/0gtweet/status/1829984410252325215). 16 | -------------------------------------------------------------------------------- /dist/handle_finder.cna: -------------------------------------------------------------------------------- 1 | alias enumhandles 2 | { 3 | local('$bid $barch $args $process'); 4 | 5 | if (size(@_) != 2) 6 | { 7 | berror($1, "Incorrect usage!"); 8 | berror($1, beacon_command_detail("enumhandles")); 9 | return; 10 | } 11 | 12 | $bid = $1; 13 | $barch = barch($1); 14 | $process = $2; 15 | 16 | # read in the right BOF file 17 | $handle = openf(script_resource("handle_finder. $+ $barch $+ .o")); 18 | $data = readb($handle, -1); 19 | closef($handle); 20 | 21 | # Pack the arguments 22 | $args = bof_pack($bid, "z", $process); 23 | 24 | # Announce what we are doing 25 | blog($bid, "Enumerating open handles for " . $process); 26 | 27 | # Execute BOF 28 | beacon_inline_execute($bid, $data, "go", $args); 29 | } 30 | 31 | 32 | beacon_command_register( 33 | "enumhandles", 34 | "Identify processes that have an open handle to a file on disk", 35 | " 36 | Command: enumhandles 37 | Summary: This BOF will identify all processes that hold a handle to 38 | the specified file on disk. This can be useful to identify 39 | processes that are locking a file on disk. 40 | 41 | Usage: enumhandles 42 | 43 | path\\to\\file - The full path of the file on disk you wish to query. 44 | 45 | Example: 46 | enumhandles C:\\Windows\\explorer.exe 47 | enumhandles \"C:\\Program Files (x86)\\Microsoft\\Edge\\Application\\msedge.exe\" 48 | 49 | Note: - This BOF can experience problems when enumerating handles to x64 images 50 | from an x86 Beacon (e.g. enumhandles c:\\windows\\sysnative\\svchost.exe) 51 | " 52 | ); -------------------------------------------------------------------------------- /img/.gitkeep: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Octoberfest7/enumhandles_BOF/5b01444859a91444a3f2ac6e1c0d2cf1244d5c8f/img/.gitkeep -------------------------------------------------------------------------------- /img/enumhandles.PNG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/Octoberfest7/enumhandles_BOF/5b01444859a91444a3f2ac6e1c0d2cf1244d5c8f/img/enumhandles.PNG -------------------------------------------------------------------------------- /src/beacon.h: -------------------------------------------------------------------------------- 1 | /* 2 | * Beacon Object Files (BOF) 3 | * ------------------------- 4 | * A Beacon Object File is a light-weight post exploitation tool that runs 5 | * with Beacon's inline-execute command. 6 | * 7 | * Additional BOF resources are available here: 8 | * - https://github.com/Cobalt-Strike/bof_template 9 | * 10 | * Cobalt Strike 4.x 11 | * ChangeLog: 12 | * 1/25/2022: updated for 4.5 13 | * 7/18/2023: Added BeaconInformation API for 4.9 14 | * 7/31/2023: Added Key/Value store APIs for 4.9 15 | * BeaconAddValue, BeaconGetValue, and BeaconRemoveValue 16 | * 8/31/2023: Added Data store APIs for 4.9 17 | * BeaconDataStoreGetItem, BeaconDataStoreProtectItem, 18 | * BeaconDataStoreUnprotectItem, and BeaconDataStoreMaxEntries 19 | * 9/01/2023: Added BeaconGetCustomUserData API for 4.9 20 | * 3/21/2024: Updated BeaconInformation API for 4.10 to return a BOOL 21 | * Updated the BEACON_INFO data structure to add new parameters 22 | * 4/19/2024: Added BeaconGetSyscallInformation API for 4.10 23 | * 4/25/2024: Added APIs to call Beacon's system call implementation 24 | */ 25 | #ifndef _BEACON_H_ 26 | #define _BEACON_H_ 27 | #include 28 | 29 | #ifdef __cplusplus 30 | extern "C" { 31 | #endif // __cplusplus 32 | 33 | /* data API */ 34 | typedef struct { 35 | char * original; /* the original buffer [so we can free it] */ 36 | char * buffer; /* current pointer into our buffer */ 37 | int length; /* remaining length of data */ 38 | int size; /* total size of this buffer */ 39 | } datap; 40 | 41 | DECLSPEC_IMPORT void BeaconDataParse(datap * parser, char * buffer, int size); 42 | DECLSPEC_IMPORT char * BeaconDataPtr(datap * parser, int size); 43 | DECLSPEC_IMPORT int BeaconDataInt(datap * parser); 44 | DECLSPEC_IMPORT short BeaconDataShort(datap * parser); 45 | DECLSPEC_IMPORT int BeaconDataLength(datap * parser); 46 | DECLSPEC_IMPORT char * BeaconDataExtract(datap * parser, int * size); 47 | 48 | /* format API */ 49 | typedef struct { 50 | char * original; /* the original buffer [so we can free it] */ 51 | char * buffer; /* current pointer into our buffer */ 52 | int length; /* remaining length of data */ 53 | int size; /* total size of this buffer */ 54 | } formatp; 55 | 56 | DECLSPEC_IMPORT void BeaconFormatAlloc(formatp * format, int maxsz); 57 | DECLSPEC_IMPORT void BeaconFormatReset(formatp * format); 58 | DECLSPEC_IMPORT void BeaconFormatAppend(formatp * format, const char * text, int len); 59 | DECLSPEC_IMPORT void BeaconFormatPrintf(formatp * format, const char * fmt, ...); 60 | DECLSPEC_IMPORT char * BeaconFormatToString(formatp * format, int * size); 61 | DECLSPEC_IMPORT void BeaconFormatFree(formatp * format); 62 | DECLSPEC_IMPORT void BeaconFormatInt(formatp * format, int value); 63 | 64 | /* Output Functions */ 65 | #define CALLBACK_OUTPUT 0x0 66 | #define CALLBACK_OUTPUT_OEM 0x1e 67 | #define CALLBACK_OUTPUT_UTF8 0x20 68 | #define CALLBACK_ERROR 0x0d 69 | #define CALLBACK_CUSTOM 0x1000 70 | #define CALLBACK_CUSTOM_LAST 0x13ff 71 | 72 | 73 | DECLSPEC_IMPORT void BeaconOutput(int type, const char * data, int len); 74 | DECLSPEC_IMPORT void BeaconPrintf(int type, const char * fmt, ...); 75 | 76 | 77 | /* Token Functions */ 78 | DECLSPEC_IMPORT BOOL BeaconUseToken(HANDLE token); 79 | DECLSPEC_IMPORT void BeaconRevertToken(); 80 | DECLSPEC_IMPORT BOOL BeaconIsAdmin(); 81 | 82 | /* Spawn+Inject Functions */ 83 | DECLSPEC_IMPORT void BeaconGetSpawnTo(BOOL x86, char * buffer, int length); 84 | DECLSPEC_IMPORT void BeaconInjectProcess(HANDLE hProc, int pid, char * payload, int p_len, int p_offset, char * arg, int a_len); 85 | DECLSPEC_IMPORT void BeaconInjectTemporaryProcess(PROCESS_INFORMATION * pInfo, char * payload, int p_len, int p_offset, char * arg, int a_len); 86 | DECLSPEC_IMPORT BOOL BeaconSpawnTemporaryProcess(BOOL x86, BOOL ignoreToken, STARTUPINFO * si, PROCESS_INFORMATION * pInfo); 87 | DECLSPEC_IMPORT void BeaconCleanupProcess(PROCESS_INFORMATION * pInfo); 88 | 89 | /* Utility Functions */ 90 | DECLSPEC_IMPORT BOOL toWideChar(char * src, wchar_t * dst, int max); 91 | 92 | /* Beacon Information */ 93 | /* 94 | * ptr - pointer to the base address of the allocated memory. 95 | * size - the number of bytes allocated for the ptr. 96 | */ 97 | typedef struct { 98 | char * ptr; 99 | size_t size; 100 | } HEAP_RECORD; 101 | #define MASK_SIZE 13 102 | 103 | /* Information the user can set in the USER_DATA via a UDRL */ 104 | typedef enum { 105 | PURPOSE_EMPTY, 106 | PURPOSE_GENERIC_BUFFER, 107 | PURPOSE_BEACON_MEMORY, 108 | PURPOSE_SLEEPMASK_MEMORY, 109 | PURPOSE_BOF_MEMORY, 110 | PURPOSE_USER_DEFINED_MEMORY = 1000 111 | } ALLOCATED_MEMORY_PURPOSE; 112 | 113 | typedef enum { 114 | LABEL_EMPTY, 115 | LABEL_BUFFER, 116 | LABEL_PEHEADER, 117 | LABEL_TEXT, 118 | LABEL_RDATA, 119 | LABEL_DATA, 120 | LABEL_PDATA, 121 | LABEL_RELOC, 122 | LABEL_USER_DEFINED = 1000 123 | } ALLOCATED_MEMORY_LABEL; 124 | 125 | typedef enum { 126 | METHOD_UNKNOWN, 127 | METHOD_VIRTUALALLOC, 128 | METHOD_HEAPALLOC, 129 | METHOD_MODULESTOMP, 130 | METHOD_NTMAPVIEW, 131 | METHOD_USER_DEFINED = 1000, 132 | } ALLOCATED_MEMORY_ALLOCATION_METHOD; 133 | 134 | /** 135 | * This structure allows the user to provide additional information 136 | * about the allocated heap for cleanup. It is mandatory to provide 137 | * the HeapHandle but the DestroyHeap Boolean can be used to indicate 138 | * whether the clean up code should destroy the heap or simply free the pages. 139 | * This is useful in situations where a loader allocates memory in the 140 | * processes current heap. 141 | */ 142 | typedef struct _HEAPALLOC_INFO { 143 | PVOID HeapHandle; 144 | BOOL DestroyHeap; 145 | } HEAPALLOC_INFO, *PHEAPALLOC_INFO; 146 | 147 | typedef struct _MODULESTOMP_INFO { 148 | HMODULE ModuleHandle; 149 | } MODULESTOMP_INFO, *PMODULESTOMP_INFO; 150 | 151 | typedef union _ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION { 152 | HEAPALLOC_INFO HeapAllocInfo; 153 | MODULESTOMP_INFO ModuleStompInfo; 154 | PVOID Custom; 155 | } ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION, *PALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION; 156 | 157 | typedef struct _ALLOCATED_MEMORY_CLEANUP_INFORMATION { 158 | BOOL Cleanup; 159 | ALLOCATED_MEMORY_ALLOCATION_METHOD AllocationMethod; 160 | ALLOCATED_MEMORY_ADDITIONAL_CLEANUP_INFORMATION AdditionalCleanupInformation; 161 | } ALLOCATED_MEMORY_CLEANUP_INFORMATION, *PALLOCATED_MEMORY_CLEANUP_INFORMATION; 162 | 163 | typedef struct _ALLOCATED_MEMORY_SECTION { 164 | ALLOCATED_MEMORY_LABEL Label; // A label to simplify Sleepmask development 165 | PVOID BaseAddress; // Pointer to virtual address of section 166 | SIZE_T VirtualSize; // Virtual size of the section 167 | DWORD CurrentProtect; // Current memory protection of the section 168 | DWORD PreviousProtect; // The previous memory protection of the section (prior to masking/unmasking) 169 | BOOL MaskSection; // A boolean to indicate whether the section should be masked 170 | } ALLOCATED_MEMORY_SECTION, *PALLOCATED_MEMORY_SECTION; 171 | 172 | typedef struct _ALLOCATED_MEMORY_REGION { 173 | ALLOCATED_MEMORY_PURPOSE Purpose; // A label to indicate the purpose of the allocated memory 174 | PVOID AllocationBase; // The base address of the allocated memory block 175 | SIZE_T RegionSize; // The size of the allocated memory block 176 | DWORD Type; // The type of memory allocated 177 | ALLOCATED_MEMORY_SECTION Sections[8]; // An array of section information structures 178 | ALLOCATED_MEMORY_CLEANUP_INFORMATION CleanupInformation; // Information required to cleanup the allocation 179 | } ALLOCATED_MEMORY_REGION, *PALLOCATED_MEMORY_REGION; 180 | 181 | typedef struct { 182 | ALLOCATED_MEMORY_REGION AllocatedMemoryRegions[6]; 183 | } ALLOCATED_MEMORY, *PALLOCATED_MEMORY; 184 | 185 | /* 186 | * version - The version of the beacon dll was added for release 4.10 187 | * version format: 0xMMmmPP, where MM = Major, mm = Minor, and PP = Patch 188 | * e.g. 0x040900 -> CS 4.9 189 | * 0x041000 -> CS 4.10 190 | * 191 | * sleep_mask_ptr - pointer to the sleep mask base address 192 | * sleep_mask_text_size - the sleep mask text section size 193 | * sleep_mask_total_size - the sleep mask total memory size 194 | * 195 | * beacon_ptr - pointer to beacon's base address 196 | * The stage.obfuscate flag affects this value when using CS default loader. 197 | * true: beacon_ptr = allocated_buffer - 0x1000 (Not a valid address) 198 | * false: beacon_ptr = allocated_buffer (A valid address) 199 | * For a UDRL the beacon_ptr will be set to the 1st argument to DllMain 200 | * when the 2nd argument is set to DLL_PROCESS_ATTACH. 201 | * heap_records - list of memory addresses on the heap beacon wants to mask. 202 | * The list is terminated by the HEAP_RECORD.ptr set to NULL. 203 | * mask - the mask that beacon randomly generated to apply 204 | * 205 | * Added in version 4.10 206 | * allocatedMemory - An ALLOCATED_MEMORY structure that can be set in the USER_DATA 207 | * via a UDRL. 208 | */ 209 | typedef struct { 210 | unsigned int version; 211 | char * sleep_mask_ptr; 212 | DWORD sleep_mask_text_size; 213 | DWORD sleep_mask_total_size; 214 | 215 | char * beacon_ptr; 216 | HEAP_RECORD * heap_records; 217 | char mask[MASK_SIZE]; 218 | 219 | ALLOCATED_MEMORY allocatedMemory; 220 | } BEACON_INFO, *PBEACON_INFO; 221 | 222 | DECLSPEC_IMPORT BOOL BeaconInformation(PBEACON_INFO info); 223 | 224 | /* Key/Value store functions 225 | * These functions are used to associate a key to a memory address and save 226 | * that information into beacon. These memory addresses can then be 227 | * retrieved in a subsequent execution of a BOF. 228 | * 229 | * key - the key will be converted to a hash which is used to locate the 230 | * memory address. 231 | * 232 | * ptr - a memory address to save. 233 | * 234 | * Considerations: 235 | * - The contents at the memory address is not masked by beacon. 236 | * - The contents at the memory address is not released by beacon. 237 | * 238 | */ 239 | DECLSPEC_IMPORT BOOL BeaconAddValue(const char * key, void * ptr); 240 | DECLSPEC_IMPORT void * BeaconGetValue(const char * key); 241 | DECLSPEC_IMPORT BOOL BeaconRemoveValue(const char * key); 242 | 243 | /* Beacon Data Store functions 244 | * These functions are used to access items in Beacon's Data Store. 245 | * BeaconDataStoreGetItem returns NULL if the index does not exist. 246 | * 247 | * The contents are masked by default, and BOFs must unprotect the entry 248 | * before accessing the data buffer. BOFs must also protect the entry 249 | * after the data is not used anymore. 250 | * 251 | */ 252 | 253 | #define DATA_STORE_TYPE_EMPTY 0 254 | #define DATA_STORE_TYPE_GENERAL_FILE 1 255 | 256 | typedef struct { 257 | int type; 258 | DWORD64 hash; 259 | BOOL masked; 260 | char* buffer; 261 | size_t length; 262 | } DATA_STORE_OBJECT, *PDATA_STORE_OBJECT; 263 | 264 | DECLSPEC_IMPORT PDATA_STORE_OBJECT BeaconDataStoreGetItem(size_t index); 265 | DECLSPEC_IMPORT void BeaconDataStoreProtectItem(size_t index); 266 | DECLSPEC_IMPORT void BeaconDataStoreUnprotectItem(size_t index); 267 | DECLSPEC_IMPORT size_t BeaconDataStoreMaxEntries(); 268 | 269 | /* Beacon User Data functions */ 270 | DECLSPEC_IMPORT char * BeaconGetCustomUserData(); 271 | 272 | /* Beacon System call */ 273 | /* Syscalls API */ 274 | typedef struct 275 | { 276 | PVOID fnAddr; 277 | PVOID jmpAddr; 278 | DWORD sysnum; 279 | } SYSCALL_API_ENTRY, *PSYSCALL_API_ENTRY; 280 | 281 | typedef struct 282 | { 283 | SYSCALL_API_ENTRY ntAllocateVirtualMemory; 284 | SYSCALL_API_ENTRY ntProtectVirtualMemory; 285 | SYSCALL_API_ENTRY ntFreeVirtualMemory; 286 | SYSCALL_API_ENTRY ntGetContextThread; 287 | SYSCALL_API_ENTRY ntSetContextThread; 288 | SYSCALL_API_ENTRY ntResumeThread; 289 | SYSCALL_API_ENTRY ntCreateThreadEx; 290 | SYSCALL_API_ENTRY ntOpenProcess; 291 | SYSCALL_API_ENTRY ntOpenThread; 292 | SYSCALL_API_ENTRY ntClose; 293 | SYSCALL_API_ENTRY ntCreateSection; 294 | SYSCALL_API_ENTRY ntMapViewOfSection; 295 | SYSCALL_API_ENTRY ntUnmapViewOfSection; 296 | SYSCALL_API_ENTRY ntQueryVirtualMemory; 297 | SYSCALL_API_ENTRY ntDuplicateObject; 298 | SYSCALL_API_ENTRY ntReadVirtualMemory; 299 | SYSCALL_API_ENTRY ntWriteVirtualMemory; 300 | SYSCALL_API_ENTRY ntReadFile; 301 | SYSCALL_API_ENTRY ntWriteFile; 302 | SYSCALL_API_ENTRY ntCreateFile; 303 | } SYSCALL_API, *PSYSCALL_API; 304 | 305 | /* Additional Run Time Library (RTL) addresses used to support system calls. 306 | * If they are not set then system calls that require them will fall back 307 | * to the Standard Windows API. 308 | * 309 | * Required to support the following system calls: 310 | * ntCreateFile 311 | */ 312 | typedef struct 313 | { 314 | PVOID rtlDosPathNameToNtPathNameUWithStatusAddr; 315 | PVOID rtlFreeHeapAddr; 316 | PVOID rtlGetProcessHeapAddr; 317 | } RTL_API, *PRTL_API; 318 | 319 | typedef struct 320 | { 321 | PSYSCALL_API syscalls; 322 | PRTL_API rtls; 323 | } BEACON_SYSCALLS, *PBEACON_SYSCALLS; 324 | 325 | DECLSPEC_IMPORT BOOL BeaconGetSyscallInformation(PBEACON_SYSCALLS info, BOOL resolveIfNotInitialized); 326 | 327 | /* Beacon System call functions which will use the current system call method */ 328 | DECLSPEC_IMPORT LPVOID BeaconVirtualAlloc(LPVOID lpAddress, SIZE_T dwSize, DWORD flAllocationType, DWORD flProtect); 329 | DECLSPEC_IMPORT LPVOID BeaconVirtualAllocEx(HANDLE processHandle, LPVOID lpAddress, SIZE_T dwSize, DWORD flAllocationType, DWORD flProtect); 330 | DECLSPEC_IMPORT BOOL BeaconVirtualProtect(LPVOID lpAddress, SIZE_T dwSize, DWORD flNewProtect, PDWORD lpflOldProtect); 331 | DECLSPEC_IMPORT BOOL BeaconVirtualProtectEx(HANDLE processHandle, LPVOID lpAddress, SIZE_T dwSize, DWORD flNewProtect, PDWORD lpflOldProtect); 332 | DECLSPEC_IMPORT BOOL BeaconVirtualFree(LPVOID lpAddress, SIZE_T dwSize, DWORD dwFreeType); 333 | DECLSPEC_IMPORT BOOL BeaconGetThreadContext(HANDLE threadHandle, PCONTEXT threadContext); 334 | DECLSPEC_IMPORT BOOL BeaconSetThreadContext(HANDLE threadHandle, PCONTEXT threadContext); 335 | DECLSPEC_IMPORT DWORD BeaconResumeThread(HANDLE threadHandle); 336 | DECLSPEC_IMPORT HANDLE BeaconOpenProcess(DWORD desiredAccess, BOOL inheritHandle, DWORD processId); 337 | DECLSPEC_IMPORT HANDLE BeaconOpenThread(DWORD desiredAccess, BOOL inheritHandle, DWORD threadId); 338 | DECLSPEC_IMPORT BOOL BeaconCloseHandle(HANDLE object); 339 | DECLSPEC_IMPORT BOOL BeaconUnmapViewOfFile(LPCVOID baseAddress); 340 | DECLSPEC_IMPORT SIZE_T BeaconVirtualQuery(LPCVOID address, PMEMORY_BASIC_INFORMATION buffer, SIZE_T length); 341 | DECLSPEC_IMPORT BOOL BeaconDuplicateHandle(HANDLE hSourceProcessHandle, HANDLE hSourceHandle, HANDLE hTargetProcessHandle, LPHANDLE lpTargetHandle, DWORD dwDesiredAccess, BOOL bInheritHandle, DWORD dwOptions); 342 | DECLSPEC_IMPORT BOOL BeaconReadProcessMemory(HANDLE hProcess, LPCVOID lpBaseAddress, LPVOID lpBuffer, SIZE_T nSize, SIZE_T *lpNumberOfBytesRead); 343 | DECLSPEC_IMPORT BOOL BeaconWriteProcessMemory(HANDLE hProcess, LPVOID lpBaseAddress, LPCVOID lpBuffer, SIZE_T nSize, SIZE_T *lpNumberOfBytesWritten); 344 | 345 | /* Beacon Gate APIs */ 346 | DECLSPEC_IMPORT VOID BeaconDisableBeaconGate(); 347 | DECLSPEC_IMPORT VOID BeaconEnableBeaconGate(); 348 | 349 | /* Beacon User Data 350 | * 351 | * version format: 0xMMmmPP, where MM = Major, mm = Minor, and PP = Patch 352 | * e.g. 0x040900 -> CS 4.9 353 | * 0x041000 -> CS 4.10 354 | */ 355 | 356 | #define DLL_BEACON_USER_DATA 0x0d 357 | #define BEACON_USER_DATA_CUSTOM_SIZE 32 358 | typedef struct 359 | { 360 | unsigned int version; 361 | PSYSCALL_API syscalls; 362 | char custom[BEACON_USER_DATA_CUSTOM_SIZE]; 363 | PRTL_API rtls; 364 | PALLOCATED_MEMORY allocatedMemory; 365 | } USER_DATA, * PUSER_DATA; 366 | 367 | #ifdef __cplusplus 368 | } 369 | #endif // __cplusplus 370 | #endif // _BEACON_H_ -------------------------------------------------------------------------------- /src/bofdefs.h: -------------------------------------------------------------------------------- 1 | #pragma once 2 | #include 3 | 4 | WINBASEAPI HANDLE WINAPI KERNEL32$CreateFileA (LPCSTR lpFileName, DWORD dwDesiredAccess, DWORD dwShareMode, LPSECURITY_ATTRIBUTES lpSecurityAttributes, DWORD dwCreationDisposition, DWORD dwFlagsAndAttributes, HANDLE hTemplateFile); 5 | WINBASEAPI WINBOOL WINAPI KERNEL32$CloseHandle (HANDLE hObject); 6 | WINBASEAPI DWORD WINAPI KERNEL32$GetLastError(); 7 | WINBASEAPI HANDLE WINAPI KERNEL32$OpenProcess(DWORD, BOOL, DWORD); 8 | WINBASEAPI BOOL WINAPI KERNEL32$QueryFullProcessImageNameA(HANDLE, DWORD, LPSTR, PDWORD); 9 | 10 | #define CreateFileA KERNEL32$CreateFileA 11 | #define CloseHandle KERNEL32$CloseHandle 12 | #define GetLastError KERNEL32$GetLastError 13 | #define OpenProcess KERNEL32$OpenProcess 14 | #define QueryFullProcessImageNameA KERNEL32$QueryFullProcessImageNameA 15 | 16 | NTSYSAPI NTSTATUS NTAPI NTDLL$NtQueryInformationFile(HANDLE, PIO_STATUS_BLOCK, PVOID, ULONG, FILE_INFORMATION_CLASS); 17 | 18 | #define NtQueryInformationFile NTDLL$NtQueryInformationFile 19 | 20 | WINBASEAPI void* __cdecl MSVCRT$calloc(size_t number, size_t size); 21 | WINBASEAPI void __cdecl MSVCRT$free(void* memblock); 22 | WINBASEAPI void* __cdecl MSVCRT$memset(void* dest, int c, size_t count); 23 | 24 | #define calloc MSVCRT$calloc 25 | #define free MSVCRT$free 26 | #define memset MSVCRT$memset 27 | -------------------------------------------------------------------------------- /src/main.c: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | #include 4 | #include "native.h" 5 | #include "bofdefs.h" 6 | #include "beacon.h" 7 | 8 | // Define printf format specifier based on architecture 9 | #if _WIN64 10 | #define PFORMAT "%lld" 11 | #else 12 | #define PFORMAT "%d" 13 | #endif 14 | 15 | void go(char* args, int length) 16 | { 17 | // Extract filename 18 | datap parser; 19 | BeaconDataParse(&parser, args, length); 20 | char* filename = BeaconDataExtract(&parser, NULL); 21 | 22 | // Open handle to file 23 | HANDLE hFile = CreateFileA(filename, 0, FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 24 | if( hFile == INVALID_HANDLE_VALUE) 25 | { 26 | DWORD dwGLE = GetLastError(); 27 | if (dwGLE == ERROR_FILE_NOT_FOUND || dwGLE == ERROR_PATH_NOT_FOUND) 28 | BeaconPrintf(CALLBACK_ERROR, "Cannot locate %s!", filename); 29 | else 30 | BeaconPrintf(CALLBACK_ERROR, "CreateFile failed! GLE: %d", GetLastError()); 31 | return; 32 | } 33 | 34 | // Allocate buffer + call NtQueryInformationFile 35 | int iMaxProc = 16; 36 | int iAlloc = sizeof(INT_PTR) + (sizeof(INT_PTR) * iMaxProc); 37 | void* pPidsBuffer = calloc(iAlloc, sizeof(char)); 38 | IO_STATUS_BLOCK ioStatus = {0}; 39 | NTSTATUS ntResult = NtQueryInformationFile(hFile, &ioStatus, pPidsBuffer, iAlloc, 47); 40 | 41 | // If our buffer wasn't big enough, reallocate and try again. 42 | while (ntResult == STATUS_INFO_LENGTH_MISMATCH) 43 | { 44 | iMaxProc *= 2; 45 | iAlloc = sizeof(INT_PTR) + (sizeof(INT_PTR) * iMaxProc); 46 | free(pPidsBuffer); 47 | pPidsBuffer = calloc(iAlloc, sizeof(char)); 48 | memset(&ioStatus, 0, sizeof(IO_STATUS_BLOCK)); 49 | ntResult = NtQueryInformationFile(hFile, &ioStatus, pPidsBuffer, iAlloc, 47); 50 | } 51 | 52 | // Close file handle 53 | CloseHandle(hFile); 54 | 55 | if (ntResult != STATUS_SUCCESS) 56 | { 57 | BeaconPrintf(CALLBACK_ERROR, "NtQueryInformationFile failed! GLE: %d", GetLastError()); 58 | free(pPidsBuffer); 59 | return; 60 | } 61 | 62 | // Set up output buffer 63 | formatp buffer; 64 | BeaconFormatAlloc(&buffer, 12388); 65 | 66 | // Grab number of PIDS in list from first value in buffer 67 | INT_PTR numPids = *(INT_PTR *)(pPidsBuffer); 68 | BeaconFormatPrintf(&buffer, "Number of processes with open handles to file: " PFORMAT "\n", numPids); 69 | 70 | // Iterate over each PID and resolve the associated image 71 | for (int i = 0; i < numPids * sizeof(INT_PTR); i += sizeof(INT_PTR)) 72 | { 73 | // Extract PID 74 | INT_PTR pid = *(INT_PTR *)(pPidsBuffer + sizeof(INT_PTR) + i); 75 | 76 | // Set index 77 | int index = i / sizeof(INT_PTR) + 1; 78 | 79 | // Open PID 80 | HANDLE hProc = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, FALSE, (DWORD)pid); 81 | if (hProc) 82 | { 83 | // Resolve image associated with PID 84 | CHAR imageName[MAX_PATH] = {0}; 85 | DWORD bufLen = MAX_PATH; 86 | if (QueryFullProcessImageNameA(hProc, 0, imageName, &bufLen)) 87 | BeaconFormatPrintf(&buffer, "%d. PID " PFORMAT " -> %s\n", index, pid, imageName); 88 | else 89 | BeaconFormatPrintf(&buffer, "%d. PID " PFORMAT " -> ERROR UNABLE TO RESOLVE PROCESS NAME! GLE: %d\n", index, pid, GetLastError()); 90 | 91 | // Close handle 92 | CloseHandle(hProc); 93 | } 94 | else 95 | BeaconFormatPrintf(&buffer, "%d. PID " PFORMAT " -> ERROR UNABLE TO OPEN PROCESS! GLE: %d\n", index, pid, GetLastError()); 96 | } 97 | 98 | // Return output 99 | BeaconPrintf(CALLBACK_OUTPUT, "%s\n", BeaconFormatToString(&buffer, NULL)); 100 | 101 | // Free buffers 102 | BeaconFormatFree(&buffer); 103 | memset(pPidsBuffer, 0, ioStatus.Information); 104 | free(pPidsBuffer); 105 | } --------------------------------------------------------------------------------