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Debugged PEB (beingdebugged, ntglobalflag)
2022-07-25 20:50:00 【51CTO】
Ginger ginger ··················· ~！
As the title ,PEB In fact, there are many members that can be used to detect the debugger （ Although some of the original intention is not necessarily , But there will be fixed changes when being debugged ）, But in Win7 after , There are only two that can be used ：（ So is this a good thing or a bad thing ）
Both of the above come from _PEB Structure ：（ Here is 32 position ,64 We'll talk about it later ）
typedef
struct
_PEB {
// Size: 0x1D8
/*000*/
UCHAR
InheritedAddressSpace;
/*001*/
UCHAR
ReadImageFileExecOptions;
/*002*/
UCHAR
BeingDebugged;
// When there is no debugger = 0, When there is a debugger = 1
/*003*/
UCHAR
SpareBool;
/*004*/
HANDLE
Mutant;
/*008*/
HINSTANCE
ImageBaseAddress;
/*00C*/
VOID
*
DllList;
/*010*/
PPROCESS_PARAMETERS
*
ProcessParameters;
/*014*/
ULONG
SubSystemData;
/*018*/
HANDLE
DefaultHeap;
/*01C*/
KSPIN_LOCK
FastPebLock;
/*020*/
ULONG
FastPebLockRoutine;
/*024*/
ULONG
FastPebUnlockRoutine;
/*028*/
ULONG
EnvironmentUpdateCount;
/*02C*/
ULONG
KernelCallbackTable;
/*030*/
LARGE_INTEGER
SystemReserved;
/*038*/
ULONG
FreeList;
/*03C*/
ULONG
TlsExpansionCounter;
/*040*/
ULONG
TlsBitmap;
/*044*/
LARGE_INTEGER
TlsBitmapBits;
/*04C*/
ULONG
ReadOnlySharedMemoryBase;
/*050*/
ULONG
ReadOnlySharedMemoryHeap;
/*054*/
ULONG
ReadOnlyStaticServerData;
/*058*/
ULONG
AnsiCodePageData;
/*05C*/
ULONG
OemCodePageData;
/*060*/
ULONG
UnicodeCaseTableData;
/*064*/
ULONG
NumberOfProcessors;
/*068*/
LARGE_INTEGER
NtGlobalFlag;
// When there is a debugger, it will be assigned 70h = 112
/*070*/
LARGE_INTEGER
CriticalSectionTimeout;
/*078*/
ULONG
HeapSegmentReserve;
/*07C*/
ULONG
HeapSegmentCommit;
/*080*/
ULONG
HeapDeCommitTotalFreeThreshold;
/*084*/
ULONG
HeapDeCommitFreeBlockThreshold;
/*088*/
ULONG
NumberOfHeaps;
/*08C*/
ULONG
MaximumNumberOfHeaps;
/*090*/
ULONG
ProcessHeaps;
/*094*/
ULONG
GdiSharedHandleTable;
/*098*/
ULONG
ProcessStarterHelper;
/*09C*/
ULONG
GdiDCAttributeList;
/*0A0*/
KSPIN_LOCK
LoaderLock;
/*0A4*/
ULONG
OSMajorVersion;
/*0A8*/
ULONG
OSMinorVersion;
/*0AC*/
USHORT
OSBuildNumber;
/*0AE*/
USHORT
OSCSDVersion;
/*0B0*/
ULONG
OSPlatformId;
/*0B4*/
ULONG
ImageSubsystem;
/*0B8*/
ULONG
ImageSubsystemMajorVersion;
/*0BC*/
ULONG
ImageSubsystemMinorVersion;
/*0C0*/
ULONG
ImageProcessAffinityMask;
/*0C4*/
ULONG
GdiHandleBuffer[
0x22];
/*14C*/
ULONG
PostProcessInitRoutine;
/*150*/
ULONG
TlsExpansionBitmap;
/*154*/
UCHAR
TlsExpansionBitmapBits[
0x80];
/*1D4*/
ULONG
SessionId;
}
PEB,
*
PPEB;
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Anti debug code ：
#pragma
void
*
PEB(){
void
*
Peb
=
NULL;
// receive _PEB Structure address
__asm
{
mov
eax,
fs:[
0x30] ;
PEB
mov
Peb,
eax
}
return
Peb;
}
bool
PEB_BegingDebugged(){
bool
BegingDebugged
=
false;
__asm
{
mov
eax,
fs:[
0x30] ;
PEB
mov
al,
byte
ptr
ds:[
eax
+
0x2] ;
BegingDebugged
stay
_PEB
Offset in
mov
BegingDebugged,
al
}
return
BegingDebugged;
}
bool
PEB_NtGlobalFlag(){
bool
NtGlobalFlag
=
NULL;
__asm
{
mov
eax,
fs:[
0x30] ;
PEB
mov
al,
byte
ptr
ds:[
eax
+
0x68] ;
NtGlobalFlag
stay
_PEB
Offset in
mov
NtGlobalFlag,
al
}
return
NtGlobalFlag;
}
#pragma
int
_tmain(
int
argc,
_TCHAR
*
argv[])
{
// Print PEB Initial address （ For reference ）
std::
cout
<<
"PEB() = "
<<
PEB()
<<
std::
endl;
// Detect debugger
if(
PEB_BegingDebugged()){
MessageBox(
NULL,
"PEB_BegingDebugged() Found debugger , Program exit ",
"LYSM",
NULL);
ExitProcess(
0);
}
if((
int)
PEB_NtGlobalFlag()
==
112){
MessageBox(
NULL,
"PEB_NtGlobalFlag() Found debugger , Program exit ",
"LYSM",
NULL);
ExitProcess(
0);
}
// bypass A sign of success
MessageBox(
NULL,
" The program runs here ",
"LYSM",
NULL);
getchar();
return
0;
}
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The general function is ：
Normal operation popup “ The program runs here ” Dialog box
Single out when being debugged “ Debugger detected ” And finish running
Be careful ： Experiment with the original OD It works
Let's talk about it x64 Under the _PEB structure ：
（ This is win7x64 Next use windbg View local PEB structure ）
lkd
>
dt
!
_PEB
nt
!
_PEB
+
0x000
InheritedAddressSpace :
UChar
+
0x001
ReadImageFileExecOptions :
UChar
+
0x002
BeingDebugged :
UChar
// BeingDebugged The offset does not change
+
0x003
BitField :
UChar
+
0x003
ImageUsesLargePages :
Pos
0,
1
Bit
+
0x003
IsProtectedProcess :
Pos
1,
1
Bit
+
0x003
IsLegacyProcess :
Pos
2,
1
Bit
+
0x003
IsImageDynamicallyRelocated :
Pos
3,
1
Bit
+
0x003
SkipPatchingUser32Forwarders :
Pos
4,
1
Bit
+
0x003
SpareBits :
Pos
5,
3
Bits
+
0x008
Mutant :
Ptr64
Void
+
0x010
ImageBaseAddress :
Ptr64
Void
+
0x018
Ldr :
Ptr64
_PEB_LDR_DATA
+
0x020
ProcessParameters :
Ptr64
_RTL_USER_PROCESS_PARAMETERS
+
0x028
SubSystemData :
Ptr64
Void
+
0x030
ProcessHeap :
Ptr64
Void
+
0x038
FastPebLock :
Ptr64
_RTL_CRITICAL_SECTION
+
0x040
AtlThunkSListPtr :
Ptr64
Void
+
0x048
IFEOKey :
Ptr64
Void
+
0x050
CrossProcessFlags :
Uint4B
+
0x050
ProcessInJob :
Pos
0,
1
Bit
+
0x050
ProcessInitializing :
Pos
1,
1
Bit
+
0x050
ProcessUsingVEH :
Pos
2,
1
Bit
+
0x050
ProcessUsingVCH :
Pos
3,
1
Bit
+
0x050
ProcessUsingFTH :
Pos
4,
1
Bit
+
0x050
ReservedBits0 :
Pos
5,
27
Bits
+
0x058
KernelCallbackTable :
Ptr64
Void
+
0x058
UserSharedInfoPtr :
Ptr64
Void
+
0x060
SystemReserved : [
1]
Uint4B
+
0x064
AtlThunkSListPtr32 :
Uint4B
+
0x068
ApiSetMap :
Ptr64
Void
+
0x070
TlsExpansionCounter :
Uint4B
+
0x078
TlsBitmap :
Ptr64
Void
+
0x080
TlsBitmapBits : [
2]
Uint4B
+
0x088
ReadOnlySharedMemoryBase :
Ptr64
Void
+
0x090
HotpatchInformation :
Ptr64
Void
+
0x098
ReadOnlyStaticServerData :
Ptr64
Ptr64
Void
+
0x0a0
AnsiCodePageData :
Ptr64
Void
+
0x0a8
OemCodePageData :
Ptr64
Void
+
0x0b0
UnicodeCaseTableData :
Ptr64
Void
+
0x0b8
NumberOfProcessors :
Uint4B
+
0x0bc
NtGlobalFlag :
Uint4B
// NtGlobalFlag Offset by 0x68 → 0xbc
+
0x0c0
CriticalSectionTimeout :
_LARGE_INTEGER
+
0x0c8
HeapSegmentReserve :
Uint8B
+
0x0d0
HeapSegmentCommit :
Uint8B
+
0x0d8
HeapDeCommitTotalFreeThreshold :
Uint8B
+
0x0e0
HeapDeCommitFreeBlockThreshold :
Uint8B
+
0x0e8
NumberOfHeaps :
Uint4B
+
0x0ec
MaximumNumberOfHeaps :
Uint4B
+
0x0f0
ProcessHeaps :
Ptr64
Ptr64
Void
+
0x0f8
GdiSharedHandleTable :
Ptr64
Void
+
0x100
ProcessStarterHelper :
Ptr64
Void
+
0x108
GdiDCAttributeList :
Uint4B
+
0x110
LoaderLock :
Ptr64
_RTL_CRITICAL_SECTION
+
0x118
OSMajorVersion :
Uint4B
+
0x11c
OSMinorVersion :
Uint4B
+
0x120
OSBuildNumber :
Uint2B
+
0x122
OSCSDVersion :
Uint2B
+
0x124
OSPlatformId :
Uint4B
+
0x128
ImageSubsystem :
Uint4B
+
0x12c
ImageSubsystemMajorVersion :
Uint4B
+
0x130
ImageSubsystemMinorVersion :
Uint4B
+
0x138
ActiveProcessAffinityMask :
Uint8B
+
0x140
GdiHandleBuffer : [
60]
Uint4B
+
0x230
PostProcessInitRoutine :
Ptr64
Void
+
0x238
TlsExpansionBitmap :
Ptr64
Void
+
0x240
TlsExpansionBitmapBits : [
32]
Uint4B
+
0x2c0
SessionId :
Uint4B
+
0x2c8
AppCompatFlags :
_ULARGE_INTEGER
+
0x2d0
AppCompatFlagsUser :
_ULARGE_INTEGER
+
0x2d8
pShimData :
Ptr64
Void
+
0x2e0
AppCompatInfo :
Ptr64
Void
+
0x2e8
CSDVersion :
_UNICODE_STRING
+
0x2f8
ActivationContextData :
Ptr64
_ACTIVATION_CONTEXT_DATA
+
0x300
ProcessAssemblyStorageMap :
Ptr64
_ASSEMBLY_STORAGE_MAP
+
0x308
SystemDefaultActivationContextData :
Ptr64
_ACTIVATION_CONTEXT_DATA
+
0x310
SystemAssemblyStorageMap :
Ptr64
_ASSEMBLY_STORAGE_MAP
+
0x318
MinimumStackCommit :
Uint8B
+
0x320
FlsCallback :
Ptr64
_FLS_CALLBACK_INFO
+
0x328
FlsListHead :
_LIST_ENTRY
+
0x338
FlsBitmap :
Ptr64
Void
+
0x340
FlsBitmapBits : [
4]
Uint4B
+
0x350
FlsHighIndex :
Uint4B
+
0x358
WerRegistrationData :
Ptr64
Void
+
0x360
WerShipAssertPtr :
Ptr64
Void
+
0x368
pContextData :
Ptr64
Void
+
0x370
pImageHeaderHash :
Ptr64
Void
+
0x378
TracingFlags :
Uint4B
+
0x378
HeapTracingEnabled :
Pos
0,
1
Bit
+
0x378
CritSecTracingEnabled :
Pos
1,
1
Bit
+
0x378
SpareTracingBits :
Pos
2,
30
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So just change the offset directly ？ Cough .... Surely not , as a result of vs stay x64 After compilation, it is no longer correct __asm{} Keywords recognized , If you want to continue using inline assembly , Some small configurations are needed ： Refer to this article .
x64.asm Reference code ：
We found that mov rax,gs:[60h] This line of code , Compare with the original mov eax, fs:[0x30] Offset by 0x30 Turned into 0x60, as a result of x64 Next _TEB Because of the different structure of ：（ As for the difference between registers, we won't discuss it here ）
lkd
>
dt
!
_TEB
nt
!
_TEB
+
0x000
NtTib :
_NT_TIB
+
0x038
EnvironmentPointer :
Ptr64
Void
+
0x040
ClientId :
_CLIENT_ID
+
0x050
ActiveRpcHandle :
Ptr64
Void
+
0x058
ThreadLocalStoragePointer :
Ptr64
Void
+
0x060
ProcessEnvironmentBlock :
Ptr64
_PEB
// Look here ！！！
+
0x068
LastErrorValue :
Uint4B
+
0x06c
CountOfOwnedCriticalSections :
Uint4B
+
0x070
CsrClientThread :
Ptr64
Void
+
0x078
Win32ThreadInfo :
Ptr64
Void
+
0x080
User32Reserved : [
26]
Uint4B
+
0x0e8
UserReserved : [
5]
Uint4B
+
0x100
WOW32Reserved :
Ptr64
Void
+
0x108
CurrentLocale :
Uint4B
+
0x10c
FpSoftwareStatusRegister :
Uint4B
+
0x110
SystemReserved1 : [
54]
Ptr64
Void
+
0x2c0
ExceptionCode :
Int4B
+
0x2c8
ActivationContextStackPointer :
Ptr64
_ACTIVATION_CONTEXT_STACK
+
0x2d0
SpareBytes : [
24]
UChar
+
0x2e8
TxFsContext :
Uint4B
+
0x2f0
GdiTebBatch :
_GDI_TEB_BATCH
+
0x7d8
RealClientId :
_CLIENT_ID
+
0x7e8
GdiCachedProcessHandle :
Ptr64
Void
+
0x7f0
GdiClientPID :
Uint4B
+
0x7f4
GdiClientTID :
Uint4B
+
0x7f8
GdiThreadLocalInfo :
Ptr64
Void
+
0x800
Win32ClientInfo : [
62]
Uint8B
+
0x9f0
glDispatchTable : [
233]
Ptr64
Void
+
0x1138
glReserved1 : [
29]
Uint8B
+
0x1220
glReserved2 :
Ptr64
Void
+
0x1228
glSectionInfo :
Ptr64
Void
+
0x1230
glSection :
Ptr64
Void
+
0x1238
glTable :
Ptr64
Void
+
0x1240
glCurrentRC :
Ptr64
Void
+
0x1248
glContext :
Ptr64
Void
+
0x1250
LastStatusValue :
Uint4B
+
0x1258
StaticUnicodeString :
_UNICODE_STRING
+
0x1268
StaticUnicodeBuffer : [
261]
Wchar
+
0x1478
DeallocationStack :
Ptr64
Void
+
0x1480
TlsSlots : [
64]
Ptr64
Void
+
0x1680
TlsLinks :
_LIST_ENTRY
+
0x1690
Vdm :
Ptr64
Void
+
0x1698
ReservedForNtRpc :
Ptr64
Void
+
0x16a0
DbgSsReserved : [
2]
Ptr64
Void
+
0x16b0
HardErrorMode :
Uint4B
+
0x16b8
Instrumentation : [
11]
Ptr64
Void
+
0x1710
ActivityId :
_GUID
+
0x1720
SubProcessTag :
Ptr64
Void
+
0x1728
EtwLocalData :
Ptr64
Void
+
0x1730
EtwTraceData :
Ptr64
Void
+
0x1738
WinSockData :
Ptr64
Void
+
0x1740
GdiBatchCount :
Uint4B
+
0x1744
CurrentIdealProcessor :
_PROCESSOR_NUMBER
+
0x1744
IdealProcessorValue :
Uint4B
+
0x1744
ReservedPad0 :
UChar
+
0x1745
ReservedPad1 :
UChar
+
0x1746
ReservedPad2 :
UChar
+
0x1747
IdealProcessor :
UChar
+
0x1748
GuaranteedStackBytes :
Uint4B
+
0x1750
ReservedForPerf :
Ptr64
Void
+
0x1758
ReservedForOle :
Ptr64
Void
+
0x1760
WaitingOnLoaderLock :
Uint4B
+
0x1768
SavedPriorityState :
Ptr64
Void
+
0x1770
SoftPatchPtr1 :
Uint8B
+
0x1778
ThreadPoolData :
Ptr64
Void
+
0x1780
TlsExpansionSlots :
Ptr64
Ptr64
Void
+
0x1788
DeallocationBStore :
Ptr64
Void
+
0x1790
BStoreLimit :
Ptr64
Void
+
0x1798
MuiGeneration :
Uint4B
+
0x179c
IsImpersonating :
Uint4B
+
0x17a0
NlsCache :
Ptr64
Void
+
0x17a8
pShimData :
Ptr64
Void
+
0x17b0
HeapVirtualAffinity :
Uint4B
+
0x17b8
CurrentTransactionHandle :
Ptr64
Void
+
0x17c0
ActiveFrame :
Ptr64
_TEB_ACTIVE_FRAME
+
0x17c8
FlsData :
Ptr64
Void
+
0x17d0
PreferredLanguages :
Ptr64
Void
+
0x17d8
UserPrefLanguages :
Ptr64
Void
+
0x17e0
MergedPrefLanguages :
Ptr64
Void
+
0x17e8
MuiImpersonation :
Uint4B
+
0x17ec
CrossTebFlags :
Uint2B
+
0x17ec
SpareCrossTebBits :
Pos
0,
16
Bits
+
0x17ee
SameTebFlags :
Uint2B
+
0x17ee
SafeThunkCall :
Pos
0,
1
Bit
+
0x17ee
InDebugPrint :
Pos
1,
1
Bit
+
0x17ee
HasFiberData :
Pos
2,
1
Bit
+
0x17ee
SkipThreadAttach :
Pos
3,
1
Bit
+
0x17ee
WerInShipAssertCode :
Pos
4,
1
Bit
+
0x17ee
RanProcessInit :
Pos
5,
1
Bit
+
0x17ee
ClonedThread :
Pos
6,
1
Bit
+
0x17ee
SuppressDebugMsg :
Pos
7,
1
Bit
+
0x17ee
DisableUserStackWalk :
Pos
8,
1
Bit
+
0x17ee
RtlExceptionAttached :
Pos
9,
1
Bit
+
0x17ee
InitialThread :
Pos
10,
1
Bit
+
0x17ee
SpareSameTebBits :
Pos
11,
5
Bits
+
0x17f0
TxnScopeEnterCallback :
Ptr64
Void
+
0x17f8
TxnScopeExitCallback :
Ptr64
Void
+
0x1800
TxnScopeContext :
Ptr64
Void
+
0x1808
LockCount :
Uint4B
+
0x180c
SpareUlong0 :
Uint4B
+
0x1810
ResourceRetValue :
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test.cpp Reference code ：
#include "stdafx.h"
#include <iostream>
#include <windows.h>
#include <subauth.h>
#pragma
extern
"C"
PVOID64
_cdecl
GetPeb();
// quote .asm Functions in the file
#pragma
int
_tmain(
int
argc,
_TCHAR
*
argv[])
{
// obtain 64 position Peb Address
PVOID64
Peb
=
GetPeb();
std::
cout
<<
"Peb = "
<<
std::
hex
<<
Peb
<<
std::
endl;
// obtain BeingDebugged Address
BYTE
BeingDebugged
=
*(
BYTE
*)((
BYTE
*)
Peb
+
0x2);
std::
cout
<<
"BeingDebugged = "
<<
std::
hex
<< (
DWORD)
BeingDebugged
<<
std::
endl;
// obtain NtGlobalFlag Address
BYTE
NtGlobalFlag
=
*(
BYTE
*)((
BYTE
*)
Peb
+
0xbc);
std::
cout
<<
"NtGlobalFlag = "
<<
std::
hex
<< (
DWORD)
NtGlobalFlag
<<
std::
endl;
getchar();
return
0;
}
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design sketch ：
It's finished , Tomorrow Mid Autumn Festival , Remember to go home and have a look .(ﾉﾟ∀ﾟ)ﾉ
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