~/talk

"Sneaking Past Device Guard"

Talkat CONFidence 2019 · 2019-06-03..06-04· [security]
links:none on file
slides:none on file

Claims multiple practical WDAC/Device Guard bypasses: some require admin, several abuse Microsoft Office without user clicks, and one works from low privilege using only signed native binaries. Walkthroughs include adds HKCU trusted location to run macros (VBA/DCOM lateral move), uses Excel 4 macros to register and execute shellcode in-sheet, registers JScript9 engine to CScript to bypass isClassAllowed checks, and uses MSXML XSLT or ActiveScriptEventConsumer via WMI to run scripts. One technique is patched (CVE-2018-8417); catalog hygiene keeps older signed vulnerable binaries usable. Detection focuses on command-line, WMI and registry activity.

AI-written summary · about

  1. 0:00Introduction to Device Guard
  2. 7:55VBA-based Bypasses
  3. 16:21Non-VBA Macro Bypasses
  4. 21:49Active Script Bypass Techniques
  5. 39:52Catalog Hygiene Issues
  6. 43:05Alternative Execution Benefits
  7. 45:11Detection and Defense Strategies
  8. 46:40Future of Device Guard
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