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IPCViewRestrictionsObjectIPCMsgSendRecvObjectIPC: INTERNAL OBJECTSThreadMgr ObjectlpIPCMsgSendRecvlpViewRestrictionslpViewMgr…ViewMgr ObjectlpThreadMgr_1lpViewTracker_1…lpThreadMgr_4lpViewTracker_4ViewTracker ObjectlpThreadMgrui32NumViewFileui32ViewFileArraySizelpViewFileArray…Array of ViewFile ObjectsViewFile_1 Object (free/busy)lpSameBrokerApp…………ViewFile_N Object (free/busy)lpSameBrokerApp…SameBrokerApp ObjectlpWWLIBIPCMsg……WWLIBIPCMsg ObjectLabs.mwrinfosecurity.com | © MWR Labs 24
IPC: INTERNAL OBJECTSThreadMgr ObjectOffset Size Field Comment08 LPVOID lpIPCMsgSendRecvPointer to an object that sends/receives IPCmessages0C LPVOID lpViewRestrictionsPointer to an object describing the sandboxrestrictions10 LPVOID lpViewMgr Pointer to ViewMgr objectViewMgr ObjectOffset Size Field Comment04 UINT32 ui32Num Number of untrusted files + 208 LPVOID lpThreadMgr_1 -0C LPVOID lpViewTacker_1 Pointer to ViewTracker objectViewTracker ObjectOffset Size Field Comment0C LPVOID lpThreadMgr Pointer to ThreadMgr object14 UINT32 ui32NumViewFileNumber of Protected-View files, or number ofbusy slots in ViewFilesArray18 UINT32 ui32ViewFileArraySize Size of ViewFilesArray1C UINT32 ui32UnknownHigher 2 bytes are used to calculate newui32ViewFilesArraySize when ViewFilesArray isfull20 LPVOID lpViewFileArray Pointer to an array of ViewFile objectsLabs.mwrinfosecurity.com | © MWR Labs 25
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 and 10: OperatingINTERNALS: ARCHITECTUREBro
Page 11 and 12: INTERNALS: ARCHITECTURE• Elevatio
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 23: MS OFFICE 2013 PROTECTED-VIEW SANDB
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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