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OperatingINTERNALSDefault DesktopSystemElevation PoliciesAPI CallAPI Call• Sandbox Directory, STAN_RIGHTS_ALL• Sandbox Registry, KEY_ALL_ACCESS• Office Registry, KEY_READElevation PolicyManagerInterceptionManagerBroker ProcessCOM IPCShims (Interception Client)No ActiveX Controls(*) UI Restrictions:JOB_OBJECT_UILIMIT_HANDLESJOB_OBJECT_UILIMIT_READCLIPBOARDJOB_OBJECT_UILIMIT_WRITECLIPBOARD…(https://msdn.microsoft.com/en-us/library/windows/desktop/ms684152(v=vs.85).aspx)ActiveX ControlsCOM ObjectsName-Pipe IPCProtected-View Sandbox ProcessProcess AProcess BInteractions(see *)UntrustedUntrusted File NUntrusted FileFile 1InternetLabs.mwrinfosecurity.com | © MWR Labs 22
MS OFFICE 2013 PROTECTED-VIEW SANDBOXINTER-PROCESS COMMUNICATION (IPC) MECHANISM• Internal Objects• Format of IPC Messages• Purpose of IPC MessagesLabs.mwrinfosecurity.com | © MWR Labs 23
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: 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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