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Add fat binary decryption support #297

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Merged
rooootdev merged 1 commit into from
Jun 20, 2026
Merged

Add fat binary decryption support #297

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17 changes: 12 additions & 5 deletions lara/kexploit/decrypt.m
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Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ void set_progress_callback(progress_callback_t callback) {
uint64_t text_fileoff;
uint64_t text_filesize;
uint64_t binary_size;
uint64_t fat_offset;
bool is_64;
uint32_t ncmds;
};
Expand Down Expand Up @@ -139,8 +140,16 @@ static int parse_macho(uint8_t *buf, uint64_t size, struct macho_ctx *ctx) {
if (OSSwapBigToHostInt32(archs[i].cputype) == CPU_TYPE_ARM64) {
uint32_t offset = OSSwapBigToHostInt32(archs[i].offset);
uint32_t arch_size = OSSwapBigToHostInt32(archs[i].size);
if (offset + arch_size <= size)
return parse_macho(buf + offset, arch_size, ctx);
if (offset + arch_size <= size) {
int ret = parse_macho(buf + offset, arch_size, ctx);
if (ret == 0) {
ctx->cryptoff += offset;
ctx->text_fileoff += offset;
ctx->binary_size = size;
ctx->fat_offset = offset;
}
return ret;
}
}
}
return -1;
Expand Down Expand Up @@ -388,7 +397,7 @@ static int decrypt_to_output(const char *binaryPath, pid_t pid, uint8_t *file_bu
progupdate((double)pages_done / total_pages);
}

uint64_t crypto_off = ctx->is_64 ? sizeof(struct mach_header_64) : sizeof(struct mach_header);
uint64_t crypto_off = ctx->fat_offset + (ctx->is_64 ? sizeof(struct mach_header_64) : sizeof(struct mach_header));
for (uint32_t i = 0; i < ctx->ncmds; i++) {
if (crypto_off + sizeof(struct load_command) > file_size) break;
struct load_command *lc = (struct load_command *)(decrypted + crypto_off);
Expand Down Expand Up @@ -461,5 +470,3 @@ int decrypt_app(const char *bundlePath, const char *executableName, const char *
snprintf(execPath, sizeof(execPath), "%s/%s", bundlePath, executableName);
return decrypt_binary(execPath, executableName, outputPath);
}


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