木马下载者
trojan-downloader.win32.geral.btt
捕获时间
2010-1-8
危害等级
中
病毒症状
该样本是使用“microsoft visual c /c”编写的“木马下载者，由微点主动防御软件自动捕获，采用“winupack”加壳方式试图躲避特征码扫描,加壳后长度为25,393字节，图标为“
”， 使用“ exe”扩展名，通过网页木马、下载器下载、移动介质(如u盘)等方式进行传播。
用户中毒后，会出现计算机及网络运行缓慢，杀毒软件无故退出且无法启动，出现大量未知进程等现象。
感染对象
windows 2000/windows xp/windows 2003/windows vista
传播途径
网页挂马、文件捆绑、下载器下载
防范措施
已安装使用微点主动防御软件的用户，无须任何设置，微点主动防御将自动保护您的系统免受该病毒的入侵和破坏。无论您是否已经升级到最新版本，微点主动防御都能够有效清除该病毒。如果您没有将微点主动防御软件升级到最新版，微点主动防御软件在发现该病毒后将报警提示您发现“未知木马”，请直接选择删除处理（如图1）；
图1 微点主动防御软件自动捕获未知病毒（未升级）
如果您已经将微点主动防御软件升级到最新版本，微点将报警提示您发现"trojan-downloader.win32.geral.btt”，请直接选择删除（如图2）。
图2 微点主动防御软件升级后截获已知病毒
未安装微点主动防御软件的手动解决办法：
1、手动删除以下文件：
%systemroot%\fonts\risin.ini
2、手动删除以下注册表：
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\360rp.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\360rpt.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\360safe.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\360safeup.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\360sd.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\360upp.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\arpfw.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\arswp.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\ast.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\autorun.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\autorunkiller.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\avmonitor.exe
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\ccenter.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\egui.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\frameworkservice.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\gfupd.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\guardfield.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\hijackthis.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\icesword.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\iparmor.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\kasarp.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\kav32.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\kavpfw.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\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\kregex.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\krnl360svc.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\kvmonxp.kxp
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\kvwsc.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\liveupdate360.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\mmsk.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\navapsvc.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\nod32krn.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\nod32kui.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\pfw.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\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\ravservice.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\ravtask.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\ravtray.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\rfwmain.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\rfwproxy.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\rfwstub.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\rsaupd.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\rsmain.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\runiep.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\scanfrm.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\srengldr.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\trojandetector.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\trojanwall.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\trojdie.kxp
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\vpc32.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\vstskmgr.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\woptilities.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\zhudongfangyu.exe
hkey_local_machine\system\currentcontrolset\services\aae
hkey_local_machine\system\currentcontrolset\services\qianm.sys
变量声明：
%systemdriver% 系统所在分区，通常为“c:\”
%systemroot% windodws所在目录，通常为“c:\windows”
%documents and settings% 用户文档目录，通常为“c:\documents and settings”
%temp% 临时文件夹，通常为“c:\documents and settings\当前用户名称\local settings\temp”
%programfiles% 系统程序默认安装目录，通常为：“c:\programfiles”
病毒分析
1．病毒运行后动态获取所需api地址，检查"%systemroot%\system32\taskmgr.exe"是否存在，不存在就退出当前进程；否则就执行后续步骤。
2．检查病毒所在目录下是否存在autorun.inf，如果不存在，设置系统重启后自我删除，否则就执行explorer.exe。
3．创建名称为"yming"的互斥量，设置自己为"sedebugprivilege"权限。
4．遍历进程查找ekrn.exe，如果找到就调用命令行删除ekrn服务，结束ekrn.exe和egui.exe进程。
5．遍历进程查找nod32.exe，如果找到就调用命令行删除nod32服务，结束nod32krn.exe和nod32kui.exe进程。
6．释放动态库文件"%systemdriver%\znel.dll"，并设置为隐藏属性。
7．遍历进程查找ravmond.exe，如果找到就结束ravmond.exe和rstray.exe进程。
8．创建线程，枚举并关闭杀毒软件窗口。
9．调用rundll32.exe以rktv为参数加载"%systemdriver%\znel.dll "，最后删除此文件。
10．在znel.dll中，释放驱动文件"%systemroot%\fonts\pci.sys"，创建名称为"aae"的服务，向名称为"\\.\nuv"的设备发送控制码，查找并结束360tray.exe、360safe.exe、safebox.exe、krnl360svc.exe、zhudongfangyu.exe、rstray.exe、mcshield.exe等进程，并遍历磁盘删除360和卡巴斯基的安装目录，恢复ssdt。
11．创建线程，释放文件并加载动态库文件"%temp%\nnn1.tmp"。
12．在nnn1.tmp中，提升自身权限，创建线程，连接网络，下载病毒列表到本地保存为"%systemroot%\fonts\risin.ini"；创建大量安全软件映像劫持；查找并关闭类名为"afxcontrolbar42s"的窗口。
13．创建线程，遍历查找进程，如果存在avp.exe，就通过释放avp.exe中的模块使进程退出，然后停止avp服务，退出线程。
14．创建线程，检查"%systemroot%\system32\dllcache\linkinfo.dll"是否存在，如果不存在，就拷贝"%systemroot%\system32\linkinfo.dll"为"%systemroot%\system32\dllcache\linkinfo.dll"，将"%systemroot%\system32\linkinfo.dll"映射到内存，释放驱动文件"%systemroot%\fonts\qianm.sys"，创建名称为"qianm"的服务，感染"%systemroot%\system32\linkinfo.dll"。
病毒创建文件：
%systemdriver%\znel.dll
%systemroot%\fonts\pci.sys
% temp%\nnn1.tmp
%systemroot%\fonts\risin.ini
%systemroot%\fonts\qianm.sys
病毒删除文件：
%systemdriver%\znel.dll
%systemroot%\fonts\pci.sys
% temp%\nnn1.tmp
%systemroot%\fonts\risin.sys
病毒创建注册表：
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\360rp.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\360rpt.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\360safe.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\360safeup.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\360sd.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\360upp.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\arpfw.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\arswp.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\ast.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\autorun.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\autorunkiller.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\avmonitor.exe
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\ccenter.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\egui.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\frameworkservice.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\gfupd.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\guardfield.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\hijackthis.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\icesword.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\iparmor.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\kasarp.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\kav32.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\kavpfw.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\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\kregex.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\krnl360svc.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\kvmonxp.kxp
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\kvwsc.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\liveupdate360.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\mmsk.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\navapsvc.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\nod32krn.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\nod32kui.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\pfw.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\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\ravservice.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\ravtask.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\ravtray.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\rfwmain.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\rfwproxy.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\rfwstub.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\rsaupd.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\rsmain.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\runiep.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\scanfrm.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\srengldr.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\trojandetector.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\trojanwall.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\trojdie.kxp
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\vpc32.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\vstskmgr.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\woptilities.exe
hkey_local_machine\software\microsoft\windows nt\currentversion\image file execution options\zhudongfangyu.exe
hkey_local_machine\system\currentcontrolset\services\aae
hkey_local_machine\system\currentcontrolset\services\qianm.sys
病毒访问网络：
http://xbg.**.la/n/ww.exe
http://u.*****.com/v.txt
