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INTERNALS: INITIALIZATION• Sandboxing implementation (“Practical Sandboxing on the Windows Platform”):– Restricted access token– GUI sub-system security– Job object restrictionsLabs.mwrinfosecurity.com | © MWR Labs 14
INTERNALS: INITIALIZATIONMSO.sub_00AD0245()Job Object RestrictionsUnkObj.fAlternateWinStation==1Creates unique sandbox name, lpSandboxName:• lpSandboxName = "OICE_15_974FA576_32C1D314_“Creates sandbox job object, hSandboxJob, with lpSandboxNameSets hSandboxJob with JobObjectBasicUIRestrictions restrictions(UnkObj.fAlternateWinStation==0 && UnkObj.Offset_2A==0)JOBOBJECT_BASIC_UI_RESTRICTIONS.UIRestrictionsClass=0xE8DefaultJOBOBJECT_BASIC_UI_RESTRICTIONS.UIRestrictionsClas=0xFFJOBOBJECT_BASIC_UI_RESTRICTIONS.UIRestrictionsClass=0x00Sets hSandboxJob with JobObjectExtendedLimitInformation restrictions:• JOBOBJECT_BASIC_LIMIT_INFORMATION.ActiveProcessLimit = 1• JOBOBJECT_BASIC_LIMIT_INFORMATION.LimitFlags = 0x2408LowIntegrity-modeActions according to sandbox modeAppContainer-modeSandbox-SID = “S-1-5-21-1734954099-297494”Access Token RestrictionsCreates sandbox token, hSandboxToken, with restricted rights:• Disable these SIDs from TokenGroups:• Domain-Users, Administrators, Console Logon, This Organization,NTLM Authentication, Medium Mandatory Level• Restricting these SIDs from TokenGroups:• Restricted Code, Everyone, Users, Logon Session, Sandbox-SIDSandbox-SID = DeriveAppContainerSidFromAppContainerName() with lpSandboxNameOrange: Differences between Low-Integrity mode and AppContainer mode• If HKLM\Software\Microsoft\Office\15.0\Common\Security\UserAppContainer == 1• If GetProcAddress() for Userrenv.DeriveAppContainerSidFromAppContainerName()and Userrenv.GetAppContainerFolderPath() succeedsGreen: Differences due to application settingsLabs.mwrinfosecurity.com | © MWR Labs 15
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: OperatingINTERNALS: ARCHITECTUREBro
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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