病毒名称(中文):
木马下载器36864
病毒别名:
威胁级别:
★★☆☆☆
病毒类型:
木马下载器
病毒长度:
36864
影响系统:
Win9xWinMeWinNTWin2000WinXPWin2003
病毒行为:
该木马为一个下载者木马，运行后会将自身改名为1sass.exe并复制到系统的system目录，然后删除自身。1sass.exe会将自己添加为系统服务，然后以服务的方式运行。该服务运行之后会首先从指定网址下载一个病毒列表的文本，然后对照该文本中的网址下载木马并运行，跟踪发现该木马下载的为一个远程控制软件，当该软件安装并运行之后，黑客可以完全控制用户的电脑。
将自身复制到%systemRoot%\system\1sass.exe
在该木马所在目录下创建一个名为afc9fe2f418b00a0.bat的批处理文件，通过命令行调用该批处理来删除木马自身以及该批处理文件
1sass.exe行为分析
将自身注册为系统服务，并以服务的方式启动
添加的相关注册表项为：
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_DRIVERS_MANAGEMENT\0000]
"Service"="DriversManagement"
"Legacy"=dword:00000001
"ConfigFlags"=dword:00000000
"Class"="LegacyDriver"
"ClassGUID"="{8ECC055D-047F-11D1-A537-0000F8753ED1}"
"DeviceDesc"="ManageDriversinstalled"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_DRIVERS_MANAGEMENT\0000\Control]
"*NewlyCreated*"=dword:00000000
"ActiveService"="DriversManagement"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DriversManagement]
"Type"=dword:00000110
"Start"=dword:00000002
"ErrorControl"=dword:00000000
"ImagePath"=hex(2):43,00,3a,00,5c,00,57,00,49,00,4e,00,44,00,4f,00,57,00,53,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,5c,00,31,00,73,00,61,00,73,00,73,00,2e,00,65,00,78,00,65,00,00,00
"DisplayName"="ManageDriversinstalled"
"ObjectName"="LocalSystem"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DriversManagement\Security]
"Security"=hex:01,00,14,80,90,00,00,00,9c,00,00,00,14,00,00,00,30,00,00,00,02,00,1c,00,01,00,00,00,02,80,14,00,ff,01,0f,00,01,01,00,00,00,00,00,01,00,00,00,00,02,00,60,00,04,00,00,00,00,00,14,00,fd,01,02,00,01,01,00,00,00,00,00,05,12,00,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,20,02,00,00,00,00,14,00,8d,01,02,00,01,01,00,00,00,00,00,05,0b,00,00,00,00,00,18,00,fd,01,02,00,01,02,00,00,00,00,00,05,20,00,00,00,23,02,00,00,01,01,00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\DriversManagement\Enum]
"0"="Root\\LEGACY_DRIVERS_MANAGEMENT\\0000"
"Count"=dword:00000001
"NextInstance"=dword:00000001
该服务启动后首先会连接黑客网站http://nb.******.com/list.txt下载一个病毒列表的文本文件,
然后根据该列表中的网址下载其他的木马并运行，分析其下载的文件，发现为一个远程控制软件。