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Project Zero: Hunting for Bugs in Windows Mini-Filter Drivers To simplify this Windows 10 supports the ECP_TYPE_OPEN_REPARSE_GUID ECP You add the ECP with a buffer containing an OPEN_REPARSE_LIST_ENTRY structure which defines the reparse tag the driver handles When NTFS encounters a reparse point buffer it checks to see if it’s in the open reparse list
PowerPoint Presentation By reverse engineering the framework’s main driver – wcifs sys, we managed to create a fake container, insert our process into it and utilize the framework’s I O redirection mechanism to our advantage
Contain Yourself: Staying Undetected Using the Windows Container . . . The Windows Container Isolation FS (wcifs) mini-filter driver is responsible for the file system separation between Windows containers and their host This is the driver that handles the ghost files redirection, and it does this by parsing their attached reparse points
CREATE_REDIRECTION_ECP_CONTEXT - Windows drivers The CREATE_REDIRECTION_ECP_CONTEXT structure contains the extra create parameter (ECP) context that can be sent to query the redirection state of a file for a specific create operation
Vetoing a Bind Link - Windows drivers | Microsoft Learn Irp has a GUID_ECP_TYPE_VETO_BINDING ECP with a VETO_BINDING_ECP_CONTEXT structure as the ECP context Since BindFlt is sending the IRP, a filter must sit below BindFlt in order to veto a bind link
Warning about File System Filter wcifs - what is THAT File System Filter 'wcifs' (Version 10 0, 2016-09-15T11:42:03 000000000Z) failed to attach to volume '\Device\HarddiskVolumeShadowCopy22' The filter returned a non-standard final status of 0xC000000D
Reparsing to a Different Volume in Win7 and Win8 Looking in the win8 ddk we can see some interesting definitions for an ECP with the GUID GUID_ECP_FLT_CREATEFILE_TARGET and for a structure with the name FLT_CREATEFILE_TARGET_ECP_CONTEXT
ns-ntifs-create_redirection_ecp_context. md - GitHub The **CREATE_REDIRECTION_ECP_CONTEXT** structure contains the extra create parameter (ECP) context that can be sent to query the redirection state of a file for a specific create operation | CREATE_REDIRECTION_FLAGS_SERVICED_FROM_LAYER | This is a redirected file from a layer that is not registered
Anti-virus optimization for Windows Containers - GitHub This will likely require AV to build a cache of scanned files indexed by volume GUID and FileId This is indicated by the redirection flag: WCIFS_REDIRECTION_FLAGS_CREATE_SERVICED_FROM_LAYER