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[讨论]pid=1的进程保护方案分析,我很菜,没能分析完
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发表于: 2008-7-29 02:04
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记得前一段时间看到的,不知是哪个杀木马软件的自我保护,说是当开启强力保护之后,就会把自己的pid修改为1,这样就结束不掉了.
我是驱动菜鸟,刚刚学起,知道了几个结构而已,就自己写了个简单驱动,修改指定进程的EPROCESS中的pid 值为1,效果如图(示例中修改了notepad.exe的pid):
这样修改之后,再测试一部分进程工具,结果如下:
taskmgr 无法结束
IceSword 直接BSOD
SnipeSword ; 可以正确识别PID,结束就BSOD
RKU 普通方式无法结束，Force Kill 导致BSOD
gmer.exe 无法结束
Atool.exe 可结束，但退出此程序就BSOD
就算不是被别的进程结果,而是自行退出,也会马上BSOD.我想这是因为所有线程退出的流程都是一样的,不管线程是自杀还是他杀,最终都是执行了PspExitThread,而问题应该就在这个函数.
BSOD截图如下:
用Windbg分析用IceSword结束时BSOD产生的Minidump,结果如下:
kd> !analyze -v
*******************************************************************************
* *
* Bugcheck Analysis *
* *
*******************************************************************************
CID_HANDLE_DELETION (17)
Arguments:
Arg1: 00000000
Arg2: 00000000
Arg3: 00000000
Arg4: 00000000
Debugging Details:
------------------
CUSTOMER_CRASH_COUNT: 2
DEFAULT_BUCKET_ID: CODE_CORRUPTION
BUGCHECK_STR: 0x17
PROCESS_NAME: svchost.exe
LAST_CONTROL_TRANSFER: from 805fad7b to 80534523
STACK_TEXT:
ba51fc74 805fad7b 00000017 fe829788 fe829798 nt!KeBugCheck+0x14
ba51fca4 80564af7 fe8297b0 fe829798 00000000 nt!PspProcessDelete+0x15d
ba51fcc0 804e46d5 fe8297b0 00000000 00001404 nt!ObpRemoveObjectRoutine+0xdf
ba51fce4 80567cb3 81783da0 e23b4970 81775678 nt!ObfDereferenceObject+0x5f
ba51fcfc 80567d1c e23b4970 fe8297b0 00001404 nt!ObpCloseHandleTableEntry+0x155
ba51fd44 80567d66 00001404 00000001 00000000 nt!ObpCloseHandle+0x87
ba51fd58 804df7ec 00001404 007afdbc 7c92eb94 nt!NtClose+0x1d
ba51fd58 7c92eb94 00001404 007afdbc 7c92eb94 nt!KiFastCallEntry+0xf8
WARNING: Frame IP not in any known module. Following frames may be wrong.
007afdbc 00000000 00000000 00000000 00000000 0x7c92eb94
STACK_COMMAND: kb
CHKIMG_EXTENSION: !chkimg -lo 50 -d !nt
80534533-80534537 5 bytes - nt!KeBugCheckEx
[ 8b ff 55 8b ec:e9 14 db f6 37 ]
5 errors : !nt (80534533-80534537)
MODULE_NAME: IsDrv122
IMAGE_NAME: IsDrv122.sys
DEBUG_FLR_IMAGE_TIMESTAMP: 46d28e35
FOLLOWUP_NAME: MachineOwner
MEMORY_CORRUPTOR: PATCH_IsDrv122
FAILURE_BUCKET_ID: MEMORY_CORRUPTION_PATCH_IsDrv122
BUCKET_ID: MEMORY_CORRUPTION_PATCH_IsDrv122
Followup: MachineOwner
---------
========================================================
从栈调用看,是PspProcessDelete出现错误,引发KeBugCheck.
既然我改的是pid,那么我就在WRK中找PspProcessDelete中和pid有关的操作,然后就看到这些代码,前后无关部分省略.
........
if (Process->UniqueProcessId) {
if (!(ExDestroyHandle (PspCidTable, Process->UniqueProcessId, NULL))) {
KeBugCheck (CID_HANDLE_DELETION);
}
}
......
看来好像是这里的ExDestoryHandle出了问题.
该函数的描述是:
NTKERNELAPI
BOOLEAN
ExDestroyHandle (
__inout PHANDLE_TABLE HandleTable,
__in HANDLE Handle,
__inout_opt PHANDLE_TABLE_ENTRY HandleTableEntry
)
/*
Routine Description:
This function removes a handle from a handle table.
*/
//即从一个句柄表中移除指定句柄.
EXHANDLE LocalHandle;
PETHREAD CurrentThread;
PVOID Object;
PAGED_CODE();
LocalHandle.GenericHandleOverlay = Handle;
CurrentThread = PsGetCurrentThread ();
//
// If the caller did not supply the optional handle table entry then
// locate the entry via the supplied handle, make sure it is real, and
// then lock the entry.
//
KeEnterCriticalRegionThread (&CurrentThread->Tcb);
if (HandleTableEntry == NULL) {
HandleTableEntry = ExpLookupHandleTableEntry( HandleTable,
LocalHandle );
if (!ExpIsValidObjectEntry(HandleTableEntry)) {
KeLeaveCriticalRegionThread (&CurrentThread->Tcb);
return FALSE;
}
if (!ExpLockHandleTableEntry( HandleTable, HandleTableEntry )) {
KeLeaveCriticalRegionThread (&CurrentThread->Tcb);
return FALSE;
}
} else {
EXASSERT ((HandleTableEntry->Value&EXHANDLE_TABLE_ENTRY_LOCK_BIT) == 0);
}
//
// If we are debugging handle operations then save away the details
//
if (HandleTable->DebugInfo != NULL) {
ExpUpdateDebugInfo(HandleTable, CurrentThread, Handle, HANDLE_TRACE_DB_CLOSE);
}
//
// At this point we have a locked handle table entry. Now mark it free
// which does the implicit unlock. The system will not allocate it
// again until we add it to the free list which we will do right after
// we take out the lock
//
Object = InterlockedExchangePointer (&HandleTableEntry->Object, NULL);
EXASSERT (Object != NULL);
EXASSERT ((((ULONG_PTR)Object)&EXHANDLE_TABLE_ENTRY_LOCK_BIT) == 0);
//
// Unblock any waiters waiting for this table entry.
//
ExUnblockPushLock (&HandleTable->HandleContentionEvent, NULL);
ExpFreeHandleTableEntry( HandleTable,
LocalHandle,
HandleTableEntry );
KeLeaveCriticalRegionThread (&CurrentThread->Tcb);
return TRUE;
}
接下来就到句柄表相关操作的分析了.由于能力有限,我只大概知道句柄表是3层表,后面的一些操作我就看不明白了,所以把问题发出来,恳请大牛牛们继续分析~~~我等小菜好学习一下~
[招生]科锐逆向工程师培训(2024年11月15日实地，远程教学同时开班, 第51期)
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 嗯~老V答对了，当然还有更加猥琐的方法。。。 |
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膜拜14#以上的人
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哈哈蓝屏了
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嗯~pid基本都是4的倍数，再没修改的情况下都是。原始pid+1、+2、+3都能打开该pid的进程。这或许和PspCidTable有关。sudami应该可以回答这个问题，期待dami~ 
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你把代码发上来啊。
也不知道你是怎么写的。。。
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 你这么说,把LZ搞得很不专业....不要说出来麻...
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代码比较简单基本没啥内容，就是通过PsActiveProcessLinks遍历EPROCESS链，找到记事本的EPROCESS，然后修改其UniqueProcessId一项的值为1.
刚学驱动，这个代码基本没啥价值，所以没贴，抱歉～ ================================================================ //关键函数 VOID ShowEPROCESS(void) { DWORD EProcess,FirstEProcess; LIST_ENTRY* ActiveProcessLinks; DWORD pid,dwCount=0; PUCHAR pImage; PPROCESS_INFO ProcessInfo={0}; EProcess=FirstEProcess=(DWORD)PsGetCurrentProcess(); __try { while ( EProcess!= 0) { dwCount++; pid= *( (DWORD*)( EProcess + EPROCESS_PID_OFFSET ) ); pImage= (PUCHAR)( EProcess + EPROCESS_IMAGENAME_OFFSET ) ; if (!_stricmp("notepad.exe",pImage)) { DbgPrint("Found notepad.exe,now change the PID\n"); *( (DWORD*)( EProcess + EPROCESS_PID_OFFSET ) )=1; } DbgPrint ( "[Pid=%8d] EProcess=0x%08X %s\n", pid, EProcess, pImage) ; ActiveProcessLinks = (LIST_ENTRY*) ( EProcess + EPROCESS_FLINK_OFFSET ) ; EProcess = (DWORD)ActiveProcessLinks->Flink - EPROCESS_FLINK_OFFSET ; if ( EProcess == FirstEProcess ) break ; } DbgPrint ( "ProcessCount = %d\n", dwCount ) ; } __except ( 1 ) { DbgPrint ( "EnumProcessList exception !" ) ; } } ======================================================  代码用到了EPROCESS结构在XP SP2下的一些偏移，不是此版本系统请不要随便加载附件中的驱动，否则可能BSOD． 驱动，运行记事本后，用任意驱动加载工具加载此驱动即可． ShowEPROC.rar |
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单单改个PID,我这里没出过问题;看你代码也没什么问题啊
改THREAD 的TID指向的PID到是会导致IS结束就BSOD. 现在在实习,没环境没工具.晚上回家再帮你调试下,看能否解决...
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