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新AV终结者采用ring3级hook技术对抗杀毒软件

2008/2/21 2:06:42 中国学网 跟贴 0 条 网友投稿

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截获最新的AV终结者,该变种采用ring3级hook技术直接删除杀毒软件,劫持众多网站,阻止杀毒软件更新。专杀程序紧张制作中,测试通过会及时发布,老版本AV终结者专杀运行后会自动升级。

以下是详细分析报告:

病毒名:Win32.Troj.AvKiller.hd.212992

病毒利用WH_CALLWNDPROC类型的挂钩将自身注入其他进程

**释放文件** C:/WINDOWS/system32/nfxphzn.jbt 该文件为kernel32.dll的拷贝 c:/WINDOWS/system32/yqia.btl 该文件为病毒自身的拷贝 **下载文件** w3.hao5555.com/v3/pic.bmp w3.hao5555.com/v3/Riched32.dll w3.hao5555.com/v3/search.asp w3.hao5555.com/bd.dll **修改的注册表** [HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/ShellServiceObjectDelayLoad] "xphz"="{1b5f93d7-93d7-0a4e-4e82-93d71b5f93d7}" [HKEY_CLASSES_ROOT/CLSID/{1b5f93d7-93d7-0a4e-4e82-93d71b5f93d7}/InprocServer32] @="C://WINDOWS//system32//yqia.btl""ThreadingModel"="Apartment" [HKEY_CURRENT_USER/Software/Policies/Microsoft/Windows/System] "DisableCMD"=dword:00000001 **挂接函数** RegEnumValueA RegEnumValueW -- 目的为隐藏病毒添加的注册表键值 CreateFileA CreateFileW -- 目的为保护病毒释放的文件 **卸载组件** regsvr32.exe /u /s wshom.ocx

病毒自身通过nfxphzn.jbt来调用CreateFileA和CreateFileW函数,病毒注入系统的其他进程后

(1)创建一个线程来保护其添加的注册表键值不被删除;

(2)结束杀毒软件进程;

(3)通过将ZwCreateFile的前两个字节填0加以破坏;

(4)并试图删除以下文件,(主要是杀毒软件和流氓软件清除工具的驱动、程序文件)

"mmskskin.dll" "KKClean.dll" "VirUnk.def" "AntiActi.dll" "Rsaupd.exe" "Iereset.dll" "Libclsid.dat" "KNetWch.SYS" "CleanHis.dll" "WoptiClean.sys" "kakalib.def" "libdll.dat" "kkinst.ini" "KASearch.DLL" "KAVBootC.sys" "Ras.exe" "iehelp.exe" "trojandetector.exe" "KAConfig.DLL" "KAVPassp.DLL" "hsfw.dll"

**修改hosts文件为**

hosts文件被修改后,会影响很多杀毒软件和反流氓软件的升级,影响访问相关网站

(注意一下61.152.244.167这个IP,下面发现众多流量很高的站点被劫持到61.152.244.167,可以尝试一下在IE地址栏中输入这个IP,你发现去了cn.yahoo.com)难道这个病毒在替yahoo做流量?我是不相信的,马云成功在望,不会采取这种流氓手段劫持其它网站的流量,我怀疑是栽赃。或者,中国yahoo的网盟政策被利用了。

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ishare.sina.com.cn 61.152.244.167 search.cn.yahoo.com 61.152.244.167 www.google.com 61.152.244.167 google.com 61.152.244.167 www.google.cn 61.152.244.167 www.sogou.com 61.152.244.167 www.yahoo.com.cn 61.152.244.167 cn.yahoo.com 222.73.210.148 www.comewz.com 61.152.244.167 search.tom.com 61.152.244.167 page.so.163.com 61.152.244.167 www.soso.com 61.152.244.167 sou.china.com 61.152.244.167 toolsbar.kuaiso.com 61.152.244.167 www.kuaiso.com

查询61.152.244.167,位于上海电信机房,whois信息如下:

WHOIS results for: 61.152.244.167 % Joint Whois % This server accepts single ASN, IPv4 or IPv6 queries % [whois.apnic.net node-2] % Whois data copyright terms http://www.apnic.net/db/dbcopyright.html inetnum: 61.152.244.160 - 61.152.244.191 netname: ZhongXin descr: ZhongXin country: CN admin-c: XCM3-AP tech-c: HY174-AP mnt-by: MAINT-CHINANET-SH changed: coconut-huang@edatahome.com 20030423 status: ASSIGNED NON-PORTABLE source: APNIC person: Xu Chun Ming address: 15F,618 East Yanan Road,Shanghai 200001 country: CN phone: +86-21-50600014 fax-no: +86-21-53854142 e-mail: springknow@online.sh.cn nic-hdl: XCM3-AP mnt-by: MAINT-CN-SHTELE-DATAIDC changed: coconut-huang@edatahome.com 20021007 source: APNIC person: Huang Yi address: 15F,618 East Yanan Road,Shanghai 200001 country: CN phone: +86-21-50600014 fax-no: +86-21-53854142 e-mail: coconut-huang@edatahome.com nic-hdl: HY174-AP mnt-by: MAINT-CN-SHTELE-DATAIDC changed: coconut-huang@edatahome.com 20021007 source: APNIC

APNIC手动解决该病毒的办法:使用金山清理专家,将下列文件添加到彻底删除的列表,粉碎掉,然后立即重启电脑。

C:/WINDOWS/system32/nfxphzn.jbt c:/WINDOWS/system32/yqia.btl

重启电脑,使用金山清理专家全面检测修复功能,将下面的系统执行挂钩项修复掉。

**修改的注册表** [HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/ShellServiceObjectDelayLoad] "xphz"="{1b5f93d7-93d7-0a4e-4e82-93d71b5f93d7}" [HKEY_CLASSES_ROOT/CLSID/{1b5f93d7-93d7-0a4e-4e82-93d71b5f93d7}/InprocServer32] @="C://WINDOWS//system32//yqia.btl""ThreadingModel"="Apartment" [HKEY_CURRENT_USER/Software/Policies/Microsoft/Windows/System]"DisableCMD"=dword:00000001

手动编辑hosts文件,对多数用户来说,在这里:c:/windows/system32/drivers/etc/hosts除保留127.0.0.1 localhost这一行外,其它内容全部清空。(责任编辑:李磊)

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