木馬下載器
Trojan-Downloader.Win32.Geral.a
捕獲時間
2010-4-28
危害等級
中
病毒癥狀
該樣本是使用“C ”編寫的木馬下載器，由微點主動防御軟件自動捕獲，采用“Upack”加殼方式，企圖躲避特征碼掃描，加殼后長度為“34,311”，圖標為“
”，病毒擴展名為“exe”，主要通過“文件捆綁”、“下載器下載”、“網頁掛馬”等方式傳播，病毒主要目的是下載安裝病毒木馬。
用戶中毒后，會出現本地磁盤無法雙擊打開，殺軟無故退出，系統運行緩慢，出現大量未知進程，系統無故報錯等現象。
感染對象
Windows 2000/Windows XP/Windows 2003/Windows Vista/ Windows 7
傳染途徑
網頁木馬、文件捆綁、下載器下載
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 微點主動防御軟件自動捕獲未知病毒（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木馬"Trojan-Downloader.Win32.Geral.a”，請直接選擇刪除（如圖2）。
圖2 微點主動防御軟件升級后截獲已知病毒
未安裝微點主動防御軟件的手動解決辦法：
1.結束以下進程extext6401515t.exe。
2.刪除注冊表HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options下的映像劫持項
3.用正常的hosts文件替換%SystemRoot%\system32\drivers\etc\hosts
4.手動刪除以下文件：
%SystemRoot%\extext6401515t.exe
%SystemRoot%\system32\scvhost.exe
變量聲明：
%SystemDriver% 系統所在分區，通常為“C:\”
%SystemRoot% WINDODWS所在目錄，通常為“C:\Windows”
%Documents and Settings% 用戶文檔目錄，通常為“C:\Documents and Settings”
%Temp% 臨時文件夾，通常為“C:\Documents and Settings\當前用戶名稱\Local Settings\Temp”
%ProgramFiles% 系統程序默認安裝目錄，通常為：“C:\ProgramFiles”
病毒分析：
(1)病毒調用命令行，禁用ESET服務項并結束ESET進程：
"cmd /c sc config ekrn start= disabled"
"cmd.exe /c taskkill.exe /im ekrn.exe /f"
"cmd.exe /c taskkill.exe /im egui.exe /f"
(2)病毒獲取系統路徑，創建文件%SystemRoot%\tete3032906t.dll，調用rundll32.exe以testall參數執行tete3032906t.dll(隨機命名)。待執行完畢后刪除tete3032906t.dll
(3)病毒獲取系統路徑，創建文件%SystemRoot%\extext6401515t.exe(隨機命名)并執行extext6401515t.exe
(4)提升自身權限，創建驅動%SystemRoot%\system32\drivers\pcidump.sys，為該驅動創建名稱為pcidump的服務項并開啟服務項。服務開啟后向驅動發送消息，注入userinit.exe。完成后刪除該服務項和驅動文件。
(5)病毒將自身重命名復制為%SystemRoot%\system32\scvhost.exe
(6)tete3032906t.dll提升自身權限，釋放驅動文件aec.sys和AsyncMac.sys至%SystemRoot%\system32\drivers\目錄下，并為其分別建立名稱為aec和AsyncMac的服務項。關閉系統中存在的安全軟件驅動。枚舉所有常見安全軟件的服務項和進程名。若發現，則關閉該安全軟件服務項、結束其進程并刪除相應程序，同時建立該安全軟件的映像劫持，使其不能啟動。被劫持的映像有："avp.exe"、"safeboxTray.exe"、"360Safebox.exe"、"antiarp.exe"、"ekrn.exe"、"RsAgent.exe"、"mfeann.exe"、"egui.exe"、"RavMon.exe"、"RavMonD.exe"、"RavTask.exe"、"CCenter.exe"、"RavStub.exe"、"RsTray.exe"、"ScanFrm.exe"、"Rav.exe"、"AgentSvr.exe"、"QQDoctor.exe"、"McProxy.exe"、"mcshield.exe"、"rsnetsvr.exe"、"naPrdMgr.exe"、"MpfSrv.exe"、"MPSVC.exe"、"MPSVC1.exe"、"KISSvc.exe"、"KPfwSvc.exe"、"kmailmon.exe"、"KavStart.exe"、"engineserver.exe"、"KPFW32.exe"、"KVSrvXP.exe"、"ccSetMgr.exe"、"ccEvtMgr.exe"、"defwatch.exe"、"rtvscan.exe"、"ccapp.exe"、"vptray.exe"、"mcupdmgr.exe"、"mfevtps.exe"、"mcsysmon.exe"、"mcmscsvc.exe"、"mcnasvc.exe"、"mcagent.exe"、"vstskmgr.exe"、"FrameworkService.exe"、"mcshell.exe"、"mcinsupd.exe"、"bdagent.exe"、"livesrv.exe"、"vsserv.exe"、"xcommsvr.exe"、"ccSvcHst.exe"、"SHSTAT.exe"、"McTray.exe"、"udaterui.exe"、"KAVStart.exe"、"Uplive.exe"、"KWatch.exe"、"QQDoctorRt.exep"、"DrUpdate.exe"、"rfwsrv.exe"、"RegGuide.exe"、"MPSVC2.exe"、"MPMon.exe"、"LiveUpdate360.exe"。獲取SSDT地址，恢復SSDT。成功后刪除服務項和驅動文件。
(7)extext6401515t.exe提升自身權限，關閉Windows防火墻的ALG服務項和安全中心的wscsvc服務項。并通過注冊表將病毒創建的文件%SystemRoot%\system32\scvhost.exe加載為開機啟動項。
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
名稱：RsTray
數據：C:\WINDOWS\system32\scvhost.exe
(8)病毒訪問網絡，下載文件替換%SystemRoot%\system32\drivers\etc\hosts文件。打開Netbios服務，從指定地址下載大量病毒木馬到本地運行。
病毒創建文件：
%SystemRoot%\tete3032906t.dll
%SystemRoot%\system32\drivers\aec.sys
%SystemRoot%\system32\drivers\AsyncMac.sys
%SystemRoot%\extext6401515t.exe
%SystemRoot%\system32\drivers\pcidump.sys
%SystemRoot%\system32\scvhost.exe
%SystemRoot%\system32\drivers\etc\hosts
病毒創建進程：
extext6401515t.exe
病毒創建注冊表：
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pcidump
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aec
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AsyncMac
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\avp.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\safeboxTray.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\360Safebox.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\antiarp.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ekrn.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RsAgent.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mfeann.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\egui.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavMon.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavMonD.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavTask.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\CCenter.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RavStub.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RsTray.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ScanFrm.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Rav.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\AgentSvr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\QQDoctor.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\McProxy.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mcshield.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rsnetsvr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\naPrdMgr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MpfSrv.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MPSVC.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MPSVC1.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KISSvc.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KPfwSvc.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\kmailmon.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KavStart.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\engineserver.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KPFW32.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KVSrvXP.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ccSetMgr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ccEvtMgr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\defwatch.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rtvscan.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ccapp.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\vptray.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mcupdmgr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mfevtps.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mcsysmon.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mcmscsvc.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mcnasvc.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mcagent.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\vstskmgr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\FrameworkService.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mcshell.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mcinsupd.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\bdagent.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\livesrv.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\vsserv.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\xcommsvr.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ccSvcHst.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\SHSTAT.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\McTray.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\udaterui.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KAVStart.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\Uplive.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KWatch.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\QQDoctorRtp.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\DrUpdate.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\rfwsrv.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\RegGuide.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MPSVC2.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\MPMon.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\LiveUpdate360.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
名稱：RsTray
數據：C:\WINDOWS\system32\scvhost.exe
病毒刪除文件：
%SystemRoot%\tete3032906t.dll
%SystemRoot%\system32\drivers\pcidump.sys
病毒刪除注冊表：
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pcidump
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aec
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AsyncMac
病毒訪問網絡：
http://qweqwe.x***ns.com:18364/host.pcx
http://ht8.we***od.net:94/18/tj.asp
http://qweqwe.x***ns.com:18364/dns.pcx
