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INTERNALS: ARCHITECTURE• Interception Component– Used by sandbox to redirect selected API calls– Implemented with API hooking (inline-hooking, IAT hooking or EAT hooking)– Checks for patching in sandbox process in function prologues, IAT and EAT– Interception component not present in Protected-ViewLabs.mwrinfosecurity.com | © MWR Labs 10
INTERNALS: ARCHITECTURE• Elevation Policy Component– In IE, elevation Policies are stored as registry keys• ||| format– Checks for new registry keys with this format• MS Office 2007 vs MS Office 2013– Elevation Policy component not present in Protected-ViewHKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\15.0\Common\OverridePointerModeCommon\MathFonts\*Common\LCCache\WordDocBibs\1033\*Common\LCCache\WordDocParts\1033\*………HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\15.0\Common\COM Compatibility\{CLSID}\*Common\Config\{CLSID}\*Word\Resiliency\DisabledItems\Word\Security\Trusted Documents\LastPurgeTimeUser Settings\Excel_Core\Create\Software\Microsoft\Internet Explorer\ProtocolExecute\*\WarnOnOpenExcel\Document Inspectors\*………Labs.mwrinfosecurity.com | © MWR Labs 11
Page 1 and 2: UNDERSTANDING THE MICROSOFT OFFICE
Page 3 and 4: Outline• Introduction• Sandbox
Page 5 and 6: INTRODUCTION• Sandboxing 101- Wik
Page 7 and 8: MS OFFICE 2013 PROTECTED-VIEW SANDB
Page 9: OperatingINTERNALS: ARCHITECTUREBro
Page 13 and 14: OperatingINTERNALS: ARCHITECTUREBro
Page 15 and 16: INTERNALS: INITIALIZATIONMSO.sub_00
Page 17 and 18: INTERNALS: INITIALIZATIONLowIntegri
Page 19 and 20: INTERNALS: RESTRICTIONSFile Locatio
Page 21 and 22: INTERNALS: RESTRICTIONS• Capabili
Page 25 and 26: IPC: INTERNAL OBJECTSThreadMgr Obje
Page 27 and 28: IPC: MESSAGE FORMATMessage HeaderMe
Page 29 and 30: IPC: MESSAGE 0X001000• No message
Page 31 and 32: IPC: MESSAGE 0X091000Message Body f
Page 33 and 34: IPC: MESSAGE 0X0C1000• Windows Er
Page 35 and 36: WER ServerIPC: MESSAGE 0X0C1000Wind
Page 37 and 38: IPC: MESSAGE 0X0C1000• Issue 2: D
Page 39 and 40: IPC: MESSAGE 0X0C1000• DemoLabs.m
Page 41 and 42: IPC: MESSAGE 0X0F1000• “Microso
Page 45 and 46: MS OFFICE 2016: SANDBOX INTERNALS
Page 47 and 48: MS OFFICE 2016: IPC 0X161000• New
Page 51 and 52: REFERENCES• Yason, Mark Vincent.

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