木馬下載器
Trojan-Downloader.Win32.Geral.a
捕獲時(shí)間
2010-4-28
危害等級(jí)
中
病毒癥狀
該樣本是使用“C ”編寫的木馬下載器，由微點(diǎn)主動(dòng)防御軟件自動(dòng)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(biāo)為“
”，病毒擴(kuò)展名為“exe”，主要通過“文件捆綁”、“下載器下載”、“網(wǎng)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(huì)出現(xiàn)本地磁盤無法雙擊打開，殺軟無故退出，系統(tǒng)運(yùn)行緩慢，出現(xiàn)大量未知進(jìn)程，系統(tǒng)無故報(bào)錯(cuò)等現(xiàn)象。
感染對(duì)象
Windows 2000/Windows XP/Windows 2003/Windows Vista/ Windows 7
傳染途徑
網(wǎng)頁木馬、文件捆綁、下載器下載
防范措施
已安裝使用微點(diǎn)主動(dòng)防御軟件的用戶，無須任何設(shè)置，微點(diǎn)主動(dòng)防御將自動(dòng)保護(hù)您的系統(tǒng)免受該病毒的入侵和破壞。無論您是否已經(jīng)升級(jí)到最新版本，微點(diǎn)主動(dòng)防御都能夠有效清除該病毒。如果您沒有將微點(diǎn)主動(dòng)防御軟件升級(jí)到最新版，微點(diǎn)主動(dòng)防御軟件在發(fā)現(xiàn)該病毒后將報(bào)警提示您發(fā)現(xiàn)“未知木馬“，請(qǐng)直接選擇刪除處理（如圖1）；
圖1 微點(diǎn)主動(dòng)防御軟件自動(dòng)捕獲未知病毒（未升級(jí)）
如果您已經(jīng)將微點(diǎn)主動(dòng)防御軟件升級(jí)到最新版本，微點(diǎn)將報(bào)警提示您發(fā)現(xiàn)木馬"Trojan-Downloader.Win32.Geral.a”，請(qǐng)直接選擇刪除（如圖2）。
圖2 微點(diǎn)主動(dòng)防御軟件升級(jí)后截獲已知病毒
未安裝微點(diǎn)主動(dòng)防御軟件的手動(dòng)解決辦法：
1.結(jié)束以下進(jìn)程extext6401515t.exe。
2.刪除注冊(cè)表HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options下的映像劫持項(xiàng)
3.用正常的hosts文件替換%SystemRoot%\system32\drivers\etc\hosts
4.手動(dòng)刪除以下文件：
%SystemRoot%\extext6401515t.exe
%SystemRoot%\system32\scvhost.exe
變量聲明：
%SystemDriver% 系統(tǒng)所在分區(qū)，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(shí)文件夾，通常為“C:\Documents and Settings\當(dāng)前用戶名稱\Local Settings\Temp”
%ProgramFiles% 系統(tǒng)程序默認(rèn)安裝目錄，通常為：“C:\ProgramFiles”
病毒分析：
(1)病毒調(diào)用命令行，禁用ESET服務(wù)項(xiàng)并結(jié)束ESET進(jìn)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(tǒng)路徑，創(chuàng)建文件%SystemRoot%\tete3032906t.dll，調(diào)用rundll32.exe以testall參數(shù)執(zhí)行tete3032906t.dll(隨機(jī)命名)。待執(zhí)行完畢后刪除tete3032906t.dll
(3)病毒獲取系統(tǒng)路徑，創(chuàng)建文件%SystemRoot%\extext6401515t.exe(隨機(jī)命名)并執(zhí)行extext6401515t.exe
(4)提升自身權(quán)限，創(chuàng)建驅(qū)動(dòng)%SystemRoot%\system32\drivers\pcidump.sys，為該驅(qū)動(dòng)創(chuàng)建名稱為pcidump的服務(wù)項(xiàng)并開啟服務(wù)項(xiàng)。服務(wù)開啟后向驅(qū)動(dòng)發(fā)送消息，注入userinit.exe。完成后刪除該服務(wù)項(xiàng)和驅(qū)動(dòng)文件。
(5)病毒將自身重命名復(fù)制為%SystemRoot%\system32\scvhost.exe
(6)tete3032906t.dll提升自身權(quán)限，釋放驅(qū)動(dòng)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(wù)項(xiàng)。關(guān)閉系統(tǒng)中存在的安全軟件驅(qū)動(dòng)。枚舉所有常見安全軟件的服務(wù)項(xiàng)和進(jìn)程名。若發(fā)現(xiàn)，則關(guān)閉該安全軟件服務(wù)項(xiàng)、結(jié)束其進(jìn)程并刪除相應(yīng)程序，同時(shí)建立該安全軟件的映像劫持，使其不能啟動(dòng)。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(fù)SSDT。成功后刪除服務(wù)項(xiàng)和驅(qū)動(dòng)文件。
(7)extext6401515t.exe提升自身權(quán)限，關(guān)閉Windows防火墻的ALG服務(wù)項(xiàng)和安全中心的wscsvc服務(wù)項(xiàng)。并通過注冊(cè)表將病毒創(chuàng)建的文件%SystemRoot%\system32\scvhost.exe加載為開機(jī)啟動(dòng)項(xiàng)。
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
名稱：RsTray
數(shù)據(jù)：C:\WINDOWS\system32\scvhost.exe
(8)病毒訪問網(wǎng)絡(luò)，下載文件替換%SystemRoot%\system32\drivers\etc\hosts文件。打開Netbios服務(wù)，從指定地址下載大量病毒木馬到本地運(yùn)行。
病毒創(chuàng)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(chuàng)建進(jìn)程：
extext6401515t.exe
病毒創(chuàng)建注冊(cè)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(shù)據(jù)：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(cè)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(wǎng)絡(luò)：
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
