木馬下載器
Trojan-Downloader.Win32.AntiAV.f
捕獲時間
2010-8-24
危害等級
中
病毒癥狀
該樣本是使用“C”編寫的木馬程序,由微點主動防御軟件自動捕獲,采用“UPack”加殼方式試圖躲避特征碼掃描,加殼后長度為“30,617”字節,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大量病毒并運行。
用戶中毒后,會出現網絡緩慢、殺毒軟件無故退出或失效,出現大量未知進程、Windows系統運行緩慢和無故報錯等現象。
感染對象
Windows 2000/Windows XP/Windows 2003/Windows Vista/ Windows 7
傳播途徑
文件捆綁、網頁掛馬、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.AntiAV.f”,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、拷貝相同版本的正常文件替換以下被修改文件:
%SystemRoot%\system32\drivers\etc\hosts
%SystemRoot%\system32\userinit.exe
2、手動刪除以下文件:
%SystemRoot%\system32\scvhost.exe
X:\recycle.{645FF040-5081-101B-9F08-00AA002F954E}\kav32.exe(X為磁盤盤符)
X:\AUTORUN.INF(X為磁盤盤符)
%SystemRoot%\extext11607390t.exe(隨機命名)
3、手動刪除注冊表項:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
名稱:RsTray
數據:C:\WINDOWS\system32\scvhost.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\
下屬所有映像劫持
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) 病毒打開記事本程序,查找其窗口。若存在則發送關閉命令,以此檢驗系統運行環境是否正常。
(2) 調用命令行,禁用ESET NOD32的服務項,并結束相關進程:
“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”
(3) 獲取系統路徑,創建文件:%SystemRoot%\ee3402343t.dll(隨機命名)。成功后創建進程,調用rundll32.exe以testall為參數來加載該動態鏈接庫文件。
(4) %SystemRoot%\ee3402343t.dll獲取自身自身權限信息,并將自身權限提升為SeDebugPrivilege權限。
(5) 調用sfc_os.dll庫中的五號函數,解除Windows系統保護。成功后替換%SystemRoot%\system32\drivers\路徑下的正常系統驅動文件AsyncMac.sys和aec.sys
(6)%SystemRoot%\system32\drivers\aec.sys恢復SSDT來解除安全軟件建立的系統鉤子。%SystemRoot%\system32\drivers\AsyncMac.sys則用來從驅動層結束安全軟件進程。
(7)查找大量安全軟件進程,一旦發現則立即結束。完成后建立所有查找的安全軟件的映像劫持。查找的安全軟件有:“360delays.exe”“KSWebShield.exe”“rssafety.exe”“LiveUpdate360.exe”“MPMon.exe”“MPSVC2.exe”“RegGuide.exe”“rfwsrv.exe”“DrUpdate.exe”“QQDoctorRtp.exe”“KWatch.exe”“Uplive.exe”“KAVStart.exe”“udaterui.exe”“McTray.exe”“SHSTAT.exe”“ccSvcHst.exe”“xcommsvr.exe”“vsserv.exe”“livesrv.exe”“bdagent.exe”“mcinsupd.exe”“mcshell.exe”“Framewor.exe”“kService.exe”“vstskmgr.exe”“mcagent.exe”“mcnasvc.exe”“mcmscsvc.exe”“mcsysmon.exe”“mfevtps.exe”“mcupdmgr.exe”“vptray.exe”“ccapp.exe”“rtvscan.exe”“defwatch.exe”“ccEvtMgr.exe”“ccSetMgr.exe”“KVSrvXP.exe”“KPFW32.exe”“engineserver.exe”“KavStart.exe”“kmailmon.exe”“KPfwSvc.exe”“KISSvc.exe”“MPSVC1.exe”“MPSVC.exe”“MpfSrv.exe”“naPrdMgr.exe”“rsnetsvr.exe”“mcshield.exe”“McProxy.exe”“QQDoctor.exe”“AgentSvr.exe”“RavScanFrm.exe”“RsTray.exe”“RavStub.exe”“CCenter.exe”“RavTask.exe”“RavMonD.exe”“RavMon.exe”“egui.exe”“mfeann.exe”“RsAgent.exe”“ekrn.exe”“antiarp.exe”“360tray.exe”“360Safebox.exe”“safeboxTray.exe”“avp.exe”
對應的映像劫持路徑為:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\
8) 刪除所有開機啟動項,
(9) 病毒源程序等待進程執行,執行完畢后刪除%SystemRoot%\ee3402343t.dll文件
(10)創建線程,獲取本地磁盤盤符并查看磁盤屬性,發現本地磁盤或可移動存儲器則創建文件夾X:\recycle.{645FF040-5081-101B-9F08-00AA002F954E}\(X為磁盤盤符)并偽裝成回收站,屬性為只讀系統隱藏。完成后將自身以kav32.exe為名稱復制到該目錄下。同時在磁盤根目錄下創建X:\AUTORUN.INF(X為磁盤盤符), 屬性為只讀系統隱藏,使得用戶一旦打開對應磁盤,系統便會自動運行病毒程序。
(11) 病毒調用命令行關閉Windows安全控制中心和Intemet連接共享和防火墻服務。對應命令為:
“cmd /c net stop wscsvc”
“cmd /c net stop SharedAccess”
“cmd /c sc config sharedaccess start= disabled”
(12) 病毒創建文件%SystemRoot%\extext11607390t.exe(隨機命名),創建成功后運行該程序。
(13) extext11607390t.exe創建名為“XETTETT......”的互斥體以免重復運行。提升自身權限,將%SystemRoot%\system32\scvhost.exe設為開機啟動項。對應注冊表值為:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
名稱:RsTray
數據:C:\WINDOWS\system32\scvhost.exe
(14) 創建線程,從指定網址下載文檔替換%SystemRoot%\system32\drivers\etc\hosts文件,用以屏蔽大量安全軟件網址。
(15) 創建線程,連接黑客指定網站,并將用戶系統版本網卡MAC地址等信息發送到該網站數據庫中。
(16) 訪問指定網址,下載大量病毒程序并運行。
(17) 病毒源程序獲取系統路徑,創建驅動文件%SystemRoot%\system32\drivers\pcidump.sys,完成后將其加載為服務項。將extext11607390t.exe的地址寫入%SystemRoot%\system32\userinit.exe文件的地址空間,感染userinit.exe文件。之后,刪除pcidump.sys和對應服務項
(18) 病毒將自身復制為%SystemRoot%\system32\scvhost.exe
(19) 病毒在自己所在路徑下創建批處理文件X:\_temp.bat(X為病毒源程序所在路徑),完成后運行該批處理刪除病毒源程序和批處理自身。
病毒創建文件:
%SystemRoot%\ee3402343t.dll(隨機命名)
%SystemRoot%\system32\drivers\aec.sys
%SystemRoot%\system32\drivers\AsyncMac.sys
X:\recycle.{645FF040-5081-101B-9F08-00AA002F954E}\kav32.exe(X為磁盤盤符)
X:\AUTORUN.INF(X為磁盤盤符)
%SystemRoot%\extext11607390t.exe(隨機命名)
%SystemRoot%\system32\drivers\etc\hosts
%SystemRoot%\system32\drivers\pcidump.sys
%SystemRoot%\system32\scvhost.exe
X:\_temp.bat(X為病毒源程序所在路徑)
病毒刪除文件:
%SystemRoot%\ee3402343t.dll(隨機命名)
%SystemRoot%\system32\drivers\aec.sys
%SystemRoot%\system32\drivers\AsyncMac.sys
%SystemRoot%\system32\drivers\pcidump.sys
X:\_temp.bat(X為病毒源程序所在路徑)
病毒創建注冊表:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aec
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AsyncMac
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pcidump
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\360tray.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\RsScanFrm.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 NT\CurrentVersion\Image File Execution Options\rssafety.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\KSWebShield.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\360delays.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
名稱:RsTray
數據:C:\WINDOWS\system32\scvhost.exe
病毒刪除注冊表:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\aec
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\AsyncMac
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pcidump
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\(被清空)
病毒訪問網絡:
http://vv.kk***s.info:27788/qvod/host.txt
http://tj19.x9***s.com:2787/g1/tj.asp
http://xxx.fr***8888.com:26677/***.exe