_EPROCESS结构简单了解!

 
lkd> dt _EPROCESS
nt!_EPROCESS
   +0x000 Pcb              : _KPROCESS
   +0x06c ProcessLock      : _EX_PUSH_LOCK
   +0x070 CreateTime       : _LARGE_INTEGER
   +0x078 ExitTime         : _LARGE_INTEGER
   +0x080 RundownProtect   : _EX_RUNDOWN_REF
   +0x084 UniqueProcessId  : Ptr32 Void
   +0x088 ActiveProcessLinks : _LIST_ENTRY
   +0x090 QuotaUsage       : [3] Uint4B
   +0x09c QuotaPeak        : [3] Uint4B
   +0x0a8 CommitCharge     : Uint4B
   +0x0ac PeakVirtualSize  : Uint4B
   +0x0b0 VirtualSize      : Uint4B
   +0x0b4 SessionProcessLinks : _LIST_ENTRY
   +0x0bc DebugPort        : Ptr32 Void
   +0x0c0 ExceptionPort    : Ptr32 Void
   +0x0c4 ObjectTable      : Ptr32 _HANDLE_TABLE
   +0x0c8 Token            : _EX_FAST_REF
   +0x0cc WorkingSetLock   : _FAST_MUTEX
   +0x0ec WorkingSetPage   : Uint4B
   +0x0f0 AddressCreationLock : _FAST_MUTEX
   +0x110 HyperSpaceLock   : Uint4B
   +0x114 ForkInProgress   : Ptr32 _ETHREAD
   +0x118 HardwareTrigger  : Uint4B
   +0x11c VadRoot          : Ptr32 Void
   +0x120 VadHint          : Ptr32 Void
   +0x124 CloneRoot        : Ptr32 Void
   +0x128 NumberOfPrivatePages : Uint4B
   +0x12c NumberOfLockedPages : Uint4B
   +0x130 Win32Process     : Ptr32 Void
   +0x134 Job              : Ptr32 _EJOB
   +0x138 SectionObject    : Ptr32 Void
   +0x13c SectionBaseAddress : Ptr32 Void
   +0x140 QuotaBlock       : Ptr32 _EPROCESS_QUOTA_BLOCK
   +0x144 WorkingSetWatch  : Ptr32 _PAGEFAULT_HISTORY
   +0x148 Win32WindowStation : Ptr32 Void
   +0x14c InheritedFromUniqueProcessId : Ptr32 Void
   +0x150 LdtInformation   : Ptr32 Void
   +0x154 VadFreeHint      : Ptr32 Void
   +0x158 VdmObjects       : Ptr32 Void
   +0x15c DeviceMap        : Ptr32 Void
   +0x160 PhysicalVadList  : _LIST_ENTRY
   +0x168 PageDirectoryPte : _HARDWARE_PTE
   +0x168 Filler           : Uint8B
   +0x170 Session          : Ptr32 Void
   +0x174 ImageFileName    : [16] UChar
   +0x184 JobLinks         : _LIST_ENTRY
   +0x18c LockedPagesList  : Ptr32 Void
   +0x190 ThreadListHead   : _LIST_ENTRY
   +0x198 SecurityPort     : Ptr32 Void
   +0x19c PaeTop           : Ptr32 Void
   +0x1a0 ActiveThreads    : Uint4B
   +0x1a4 GrantedAccess    : Uint4B
   +0x1a8 DefaultHardErrorProcessing : Uint4B
   +0x1ac LastThreadExitStatus : Int4B
   +0x1b0 Peb              : Ptr32 _PEB
   +0x1b4 PrefetchTrace    : _EX_FAST_REF
   +0x1b8 ReadOperationCount : _LARGE_INTEGER
   +0x1c0 WriteOperationCount : _LARGE_INTEGER
   +0x1c8 OtherOperationCount : _LARGE_INTEGER
   +0x1d0 ReadTransferCount : _LARGE_INTEGER
   +0x1d8 WriteTransferCount : _LARGE_INTEGER
   +0x1e0 OtherTransferCount : _LARGE_INTEGER
   +0x1e8 CommitChargeLimit : Uint4B
   +0x1ec CommitChargePeak : Uint4B
   +0x1f0 AweInfo          : Ptr32 Void
   +0x1f4 SeAuditProcessCreationInfo : _SE_AUDIT_PROCESS_CREATION_INFO
   +0x1f8 Vm               : _MMSUPPORT
   +0x238 LastFaultCount   : Uint4B
   +0x23c ModifiedPageCount : Uint4B
   +0x240 NumberOfVads     : Uint4B
   +0x244 JobStatus        : Uint4B
   +0x248 Flags            : Uint4B
   +0x248 CreateReported   : Pos 0, 1 Bit
   +0x248 NoDebugInherit   : Pos 1, 1 Bit
   +0x248 ProcessExiting   : Pos 2, 1 Bit
   +0x248 ProcessDelete    : Pos 3, 1 Bit
   +0x248 Wow64SplitPages  : Pos 4, 1 Bit
   +0x248 VmDeleted        : Pos 5, 1 Bit
   +0x248 OutswapEnabled   : Pos 6, 1 Bit
   +0x248 Outswapped       : Pos 7, 1 Bit
   +0x248 ForkFailed       : Pos 8, 1 Bit
   +0x248 HasPhysicalVad   : Pos 9, 1 Bit
   +0x248 AddressSpaceInitialized : Pos 10, 2 Bits
   +0x248 SetTimerResolution : Pos 12, 1 Bit
   +0x248 BreakOnTermination : Pos 13, 1 Bit
   +0x248 SessionCreationUnderway : Pos 14, 1 Bit
   +0x248 WriteWatch       : Pos 15, 1 Bit
   +0x248 ProcessInSession : Pos 16, 1 Bit
   +0x248 OverrideAddressSpace : Pos 17, 1 Bit
   +0x248 HasAddressSpace  : Pos 18, 1 Bit
   +0x248 LaunchPrefetched : Pos 19, 1 Bit
   +0x248 InjectInpageErrors : Pos 20, 1 Bit
   +0x248 VmTopDown        : Pos 21, 1 Bit
   +0x248 Unused3          : Pos 22, 1 Bit
   +0x248 Unused4          : Pos 23, 1 Bit
   +0x248 VdmAllowed       : Pos 24, 1 Bit
   +0x248 Unused           : Pos 25, 5 Bits
   +0x248 Unused1          : Pos 30, 1 Bit
   +0x248 Unused2          : Pos 31, 1 Bit
   +0x24c ExitStatus       : Int4B
   +0x250 NextPageColor    : Uint2B
   +0x252 SubSystemMinorVersion : UChar
   +0x253 SubSystemMajorVersion : UChar
   +0x252 SubSystemVersion : Uint2B
   +0x254 PriorityClass    : UChar
   +0x255 WorkingSetAcquiredUnsafe : UChar
   +0x258 Cookie           : Uint4B
//转贴
最近研究某驱动DebugPort清零,学习了使用Windbg查看_EPROCESS结构地址,采用Syser下断查找清零代码。

下面主要写下Windbg查看进程的_EPROCESS结构,便以后查阅。

大家知道,每一个进程都对应一个_EPROCESS结构,我们如何确定一个进程的_EPROCESS地址呢?以notepad.exe为例

使用Windbg的Kernel Debug,输入命令

lkd> !process 0 0    //查看当前进程
PROCESS 8a5e7088 SessionId: 0 Cid: 0ff0    Peb: 7ffdd000 ParentCid: 0324
    DirBase: 0ac40520 ObjectTable: e1a13a30 HandleCount: 65.
    Image: windbg.exe

PROCESS 882f2650 SessionId: 0 Cid: 07d8    Peb: 7ffd7000 ParentCid: 0324
    DirBase: 0ac404e0 ObjectTable: e506af88 HandleCount: 48.
    Image: notepad.exe
。。。。。

可以看到 PROCESS 882f2650,882f2650就是notepad.exe的_EPROCESS结构地址

lkd> dt _eprocess 882f2650   //查看notepad.exe的_EPROCESS
nt!_EPROCESS
   +0x000 Pcb              : _KPROCESS
   +0x06c ProcessLock      : _EX_PUSH_LOCK
   +0x070 CreateTime       : _LARGE_INTEGER 0x1cb68eb`1575a5ee
   +0x078 ExitTime         : _LARGE_INTEGER 0x0
   +0x080 RundownProtect   : _EX_RUNDOWN_REF
   +0x084 UniqueProcessId : 0x000007d8 Void
   +0x088 ActiveProcessLinks : _LIST_ENTRY [ 0x805648b8 - 0x8a5e7110 ]
   +0x090 QuotaUsage       : [3] 0xc58
   +0x09c QuotaPeak        : [3] 0x1080
   +0x0a8 CommitCharge     : 0x220
   +0x0ac PeakVirtualSize : 0x2453000
   +0x0b0 VirtualSize      : 0x22bf000
   +0x0b4 SessionProcessLinks : _LIST_ENTRY [ 0xba632014 - 0x8a5e713c ]
   +0x0bc DebugPort        : (null) 
   +0x0c0 ExceptionPort    : 0xe1be7658 Void
   +0x0c4 ObjectTable      : 0xe506af88 _HANDLE_TABLE
   +0x0c8 Token            : _EX_FAST_REF
   +0x0cc WorkingSetLock   : _FAST_MUTEX
   +0x0ec WorkingSetPage   : 0x7bbc2
   +0x0f0 AddressCreationLock : _FAST_MUTEX
   +0x110 HyperSpaceLock   : 0
   +0x114 ForkInProgress   : (null) 
   +0x118 HardwareTrigger : 0
   +0x11c VadRoot          : 0x8a626df0 Void
   +0x120 VadHint          : 0x88380130 Void
   +0x124 CloneRoot        : (null)

_EPROCESS + bc处为Debugprot地址,可以使用Syser下断
bpm 882f2650+bc w 断在notepad.exe的DebugPort处,如有对它的处理就会断住。。

 

//转贴

如果是直接来要最终结果的,请绕行,这里只对debugport 清零代码进行逆向。

由于TX会Anti Windbg,用上次的方法后,Windbg能很好的跑起来,但是作者还是热衷于单机调试,在一次偶然的情况下,发现TX没有对SyserDebugger进行anti,这里膜拜下syserdebugger的作者,该调试器据说是作者一人开发,而该作者对内核的熟悉程度,让人有点想流口水。

不管是windbg还是syserdbg, 你都可以下 对EPROCESS+0xbc的写入断点。

windbg ba w addr

syser   bpm addr w

这里我们看到syser是兼容了softice指令的。下断后很快就会被断下,可见debugport被清零之频繁。

syser debugger 的菜单有时候会不灵,暂时只能用命令了。 u eip-40.

我们可以清晰的看到tessafe.sys如何对DebugPort清零的

mov edi, edi
push ebp
mov ebp, esp
push ecx
push ebx
xor ebx, ebx
cmp dword ptr [B1DD4050], 5
push esi
mov byte ptr [ebp-2], 1
jne short B1DCB575
cmp dword ptr [B1DD4054], ebx
mov byte ptr [ebp-1], 1
je short B1DCB578
mov byte ptr [ebp-1], bl
mov ecx, B1DD90B0
call dword ptr [<&hal.KfAcquireSpinLock>]
mov esi, dword ptr [B1DD8F60]
cmp esi, B1DD8F60
mov byte ptr [ebp-3], al
je B1DCB61B
mov byte ptr [ebp-2], bl
push edi
mov ecx, dword ptr [B1DD4EC0]
mov ecx, dword ptr [ecx+4]
lea edx, dword ptr [esi-10]
add ecx, dword ptr [edx]
xor eax, eax
xchg dword ptr [ecx], eax
cmp byte ptr [B1DD4EC8], bl
je short B1DCB610
cmp byte ptr [ebp-1], bl
mov ecx, dword ptr [B1DD4EC0]
mov eax, dword ptr [edx]
mov ecx, dword ptr [ecx+C]
mov edi, dword ptr [eax+ecx]
je short B1DCB5E0
cmp edi, ebx
jne short B1DCB610
mov ecx, dword ptr [B1DD4EC0]
mov ecx, dword ptr [ecx]
cmp dword ptr [eax+ecx], 103
je short B1DCB610
jmp short B1DCB5F2
mov ecx, dword ptr [B1DD4EC0]
mov ecx, dword ptr [ecx+10]
cmp dword ptr [eax+ecx], ebx
jne short B1DCB610
cmp edi, ebx
jne short B1DCB610
mov eax, dword ptr [esi]
mov ecx, dword ptr [esi+4]
mov dword ptr [ecx], eax
mov dword ptr [eax+4], ecx
mov eax, B1DD529C
or ecx, FFFFFFFF
lock xadd dword ptr [eax], ecx
push ebx
push edx
call dword ptr [<&ntoskrnl.ExFreePoolWithTag>]
mov esi, dword ptr [esi]
cmp esi, B1DD8F60
jne short B1DCB59C
pop edi
mov dl, byte ptr [ebp-3]
mov ecx, B1DD90B0
call dword ptr [<&hal.KfReleaseSpinLock>]
mov al, byte ptr [ebp-2]
pop esi
pop ebx
leave
retn
int3
int3
int3
int3
int3
int3

就这了。。。突然好累,不想写了。。。。 将那个指针改掉,不能改代码

新版dxxxxfffefefe 对原来的校验非常严格,这个方法已经早就行不通了,只有按照tufuzi说的,修复受影响的函数。


 

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