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windows-itpro-docs/windows/device-security/auditing/event-5145.md
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5145(S, F) A network share object was checked to see whether client can be granted desired access. (Windows 10) Describes security event 5145(S, F) A network share object was checked to see whether client can be granted desired access. security w10 deploy library Mir0sh 04/19/2017

5145(S, F): A network share object was checked to see whether client can be granted desired access.

Applies to

  • Windows 10
  • Windows Server 2016
Event 5145 illustration

Subcategory: Audit Detailed File Share

Event Description:

This event generates every time network share object (file or folder) was accessed.

Important: Failure events are generated only when access is denied at the file share level. No events are generated if access was denied on the file system (NTFS) level.

Note

  For recommendations, see Security Monitoring Recommendations for this event.


Event XML:

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
 <Provider Name="Microsoft-Windows-Security-Auditing" Guid="{54849625-5478-4994-A5BA-3E3B0328C30D}" /> 
 <EventID>5145</EventID> 
 <Version>0</Version> 
 <Level>0</Level> 
 <Task>12811</Task> 
 <Opcode>0</Opcode> 
 <Keywords>0x8020000000000000</Keywords> 
 <TimeCreated SystemTime="2015-09-17T23:54:48.941761700Z" /> 
 <EventRecordID>267092</EventRecordID> 
 <Correlation /> 
 <Execution ProcessID="516" ThreadID="524" /> 
 <Channel>Security</Channel> 
 <Computer>DC01.contoso.local</Computer> 
 <Security /> 
 </System>
- <EventData>
 <Data Name="SubjectUserSid">S-1-5-21-3457937927-2839227994-823803824-1104</Data> 
 <Data Name="SubjectUserName">dadmin</Data> 
 <Data Name="SubjectDomainName">CONTOSO</Data> 
 <Data Name="SubjectLogonId">0x38d34</Data> 
 <Data Name="ObjectType">File</Data> 
 <Data Name="IpAddress">fe80::31ea:6c3c:f40d:1973</Data> 
 <Data Name="IpPort">56926</Data> 
 <Data Name="ShareName">\\\\\*\\Documents</Data> 
 <Data Name="ShareLocalPath">\\??\\C:\\Documents</Data> 
 <Data Name="RelativeTargetName">Bginfo.exe</Data> 
 <Data Name="AccessMask">0x100081</Data> 
 <Data Name="AccessList">%%1541 %%4416 %%4423</Data> 
 <Data Name="AccessReason">%%1541: %%1801 D:(A;;FA;;;WD) %%4416: %%1801 D:(A;;FA;;;WD) %%4423: %%1801 D:(A;;FA;;;WD)</Data> 
 </EventData>
 </Event>

Required Server Roles: None.

Minimum OS Version: Windows Server 2008, Windows Vista.

Event Versions: 0.

Field Descriptions:

Subject:

  • Security ID [Type = SID]: SID of account that requested access to network share object. Event Viewer automatically tries to resolve SIDs and show the account name. If the SID cannot be resolved, you will see the source data in the event.

Note

  A security identifier (SID) is a unique value of variable length used to identify a trustee (security principal). Each account has a unique SID that is issued by an authority, such as an Active Directory domain controller, and stored in a security database. Each time a user logs on, the system retrieves the SID for that user from the database and places it in the access token for that user. The system uses the SID in the access token to identify the user in all subsequent interactions with Windows security. When a SID has been used as the unique identifier for a user or group, it cannot ever be used again to identify another user or group. For more information about SIDs, see Security identifiers.

  • Account Name [Type = UnicodeString]: the name of the account that requested access to network share object.

  • Account Domain [Type = UnicodeString]: subject’s domain or computer name. Formats vary, and include the following:

    • Domain NETBIOS name example: CONTOSO

    • Lowercase full domain name: contoso.local

    • Uppercase full domain name: CONTOSO.LOCAL

    • For some well-known security principals, such as LOCAL SERVICE or ANONYMOUS LOGON, the value of this field is “NT AUTHORITY”.

    • For local user accounts, this field will contain the name of the computer or device that this account belongs to, for example: “Win81”.

  • Logon ID [Type = HexInt64]: hexadecimal value that can help you correlate this event with recent events that might contain the same Logon ID, for example, “4624: An account was successfully logged on.”

Network Information:

  • Object Type [Type = UnicodeString]: The type of an object that was accessed during the operation. Always “File” for this event.

    The following table contains the list of the most common Object Types:

Directory Event Timer Device
Mutant Type File Token
Thread Section WindowStation DebugObject
FilterCommunicationPort EventPair Driver IoCompletion
Controller SymbolicLink WmiGuid Process
Profile Desktop KeyedEvent Adapter
Key WaitablePort Callback Semaphore
Job Port FilterConnectionPort ALPC Port

  • Source Address [Type = UnicodeString]: source IP address from which access was performed.

    • IPv6 address or ::ffff:IPv4 address of a client.

    • ::1 or 127.0.0.1 means localhost.

  • Source Port [Type = UnicodeString]: source TCP or UDP port which was used from remote or local machine to request the access.

    • 0 for local access attempts.

Share Information:

  • Share Name [Type = UnicodeString]: the name of accessed network share. The format is: \\*\SHARE_NAME.

  • Share Path [Type = UnicodeString]: the full system (NTFS) path for accessed share. The format is: \\??\PATH. Can be empty, for example for Share Name: \\*\IPC$.

  • Relative Target Name [Type = UnicodeString]: relative name of the accessed target file or folder. This file-path is relative to the network share. If access was requested for the share itself, then this field appears as “\”.

Access Request Information:

  • Access Mask [Type = HexInt32]: the sum of hexadecimal values of requested access rights. See “Table 13. File access codes.” for different hexadecimal values for access rights.

  • Accesses [Type = UnicodeString]: the list of access rights which were requested by Subject\Security ID. These access rights depend on Object Type.

Table of file access codes

Access Hex Value,
Schema Value		 Description
ReadData (or ListDirectory) 0x1,
%%4416		 ReadData - For a file object, the right to read the corresponding file data. For a directory object, the right to read the corresponding directory data.
ListDirectory - For a directory, the right to list the contents of the directory.
WriteData (or AddFile) 0x2,
%%4417		 WriteData - For a file object, the right to write data to the file. For a directory object, the right to create a file in the directory (FILE_ADD_FILE).
AddFile - For a directory, the right to create a file in the directory.
AppendData (or AddSubdirectory or CreatePipeInstance) 0x4,
%%4418		 AppendData - For a file object, the right to append data to the file. (For local files, write operations will not overwrite existing data if this flag is specified without FILE_WRITE_DATA.) For a directory object, the right to create a subdirectory (FILE_ADD_SUBDIRECTORY).
AddSubdirectory - For a directory, the right to create a subdirectory.
CreatePipeInstance - For a named pipe, the right to create a pipe.
ReadEA 0x8,
%%4419		 The right to read extended file attributes.
WriteEA 0x10,
%%4420		 The right to write extended file attributes.
Execute/Traverse 0x20,
%%4421		 Execute - For a native code file, the right to execute the file. This access right given to scripts may cause the script to be executable, depending on the script interpreter.
Traverse - For a directory, the right to traverse the directory. By default, users are assigned the BYPASS_TRAVERSE_CHECKING  privilege, which ignores the FILE_TRAVERSE  access right. See the remarks in File Security and Access Rights for more information.
DeleteChild 0x40,
%%4422		 For a directory, the right to delete a directory and all the files it contains, including read-only files.
ReadAttributes 0x80,
%%4423		 The right to read file attributes.
WriteAttributes 0x100,
%%4424		 The right to write file attributes.
DELETE 0x10000,
%%1537		 The right to delete the object.
READ_CONTROL 0x20000,
%%1538		 The right to read the information in the object's security descriptor, not including the information in the system access control list (SACL).
WRITE_DAC 0x40000,
%%1539		 The right to modify the discretionary access control list (DACL) in the object's security descriptor.
WRITE_OWNER 0x80000,
%%1540		 The right to change the owner in the object's security descriptor
SYNCHRONIZE 0x100000,
%%1541		 The right to use the object for synchronization. This enables a thread to wait until the object is in the signaled state. Some object types do not support this access right.
ACCESS_SYS_SEC 0x1000000,
%%1542		 The ACCESS_SYS_SEC access right controls the ability to get or set the SACL in an object's security descriptor.

Table 13. File access codes.

Access Check Results [Type = UnicodeString]: the list of access check results. The format of the result is:

REQUESTED_ACCESS: RESULT ACE_WHICH_ ALLOWED_OR_DENIED_ACCESS.

  • REQUESTED_ACCESS – the name of requested access. See Table of file access codes, earlier in this topic.

  • RESULT:

    • Granted by – if access was granted.

    • Denied by – if access was denied.

  • ACE_WHICH_ ALLOWED_OR_DENIED_ACCESS: the Security Descriptor Definition Language (SDDL) value for Access Control Entry (ACE), which granted or denied access.

Note

  The ** Security Descriptor Definition Language (SDDL)** defines string elements for enumerating information contained in the security descriptor.

Example:

O:BAG:SYD:(D;;0xf0007;;;AN)(D;;0xf0007;;;BG)(A;;0xf0007;;;SY)(A;;0×7;;;BA)S:ARAI(AU;SAFA;DCLCRPCRSDWDWO;;;WD)

  • O: = Owner. SID of specific security principal, or reserved (pre-defined) value, for example: BA (BUILTIN_ADMINISTRATORS), WD (Everyone), SY (LOCAL_SYSTEM), etc. See the list of possible values in the table below.

SDDL values for Access Control Entry

Value Description Value Description
"AO" Account operators "PA" Group Policy administrators
"RU" Alias to allow previous Windows 2000 "IU" Interactively logged-on user
"AN" Anonymous logon "LA" Local administrator
"AU" Authenticated users "LG" Local guest
"BA" Built-in administrators "LS" Local service account
"BG" Built-in guests "SY" Local system
"BO" Backup operators "NU" Network logon user
"BU" Built-in users "NO" Network configuration operators
"CA" Certificate server administrators "NS" Network service account
"CG" Creator group "PO" Printer operators
"CO" Creator owner "PS" Personal self
"DA" Domain administrators "PU" Power users
"DC" Domain computers "RS" RAS servers group
"DD" Domain controllers "RD" Terminal server users
"DG" Domain guests "RE" Replicator
"DU" Domain users "RC" Restricted code
"EA" Enterprise administrators "SA" Schema administrators
"ED" Enterprise domain controllers "SO" Server operators
"WD" Everyone "SU" Service logon user
  • G: = Primary Group.
  • D: = DACL Entries.
  • S: = SACL Entries.

DACL/SACL entry format: entry_type:inheritance_flags(ace_type;ace_flags;rights;object_guid;inherit_object_guid;account_sid)

Example: D:(A;;FA;;;WD)

  • entry_type:

“D” - DACL

“S” - SACL

  • inheritance_flags:

"P” - SDDL_PROTECTED, Inheritance from containers that are higher in the folder hierarchy are blocked.

"AI" - SDDL_AUTO_INHERITED, Inheritance is allowed, assuming that "P" Is not also set.

"AR" - SDDL_AUTO_INHERIT_REQ, Child objects inherit permissions from this object.

  • ace_type:

"A" - ACCESS ALLOWED

"D" - ACCESS DENIED

"OA" - OBJECT ACCESS ALLOWED: only applies to a subset of the object(s).

"OD" - OBJECT ACCESS DENIED: only applies to a subset of the object(s).

"AU" - SYSTEM AUDIT

"A" - SYSTEM ALARM

"OU" - OBJECT SYSTEM AUDIT

"OL" - OBJECT SYSTEM ALARM

  • ace_flags:

"CI" - CONTAINER INHERIT: Child objects that are containers, such as directories, inherit the ACE as an explicit ACE.

"OI" - OBJECT INHERIT: Child objects that are not containers inherit the ACE as an explicit ACE.

"NP" - NO PROPAGATE: only immediate children inherit this ace.

"IO" - INHERITANCE ONLY: ace doesn’t apply to this object, but may affect children via inheritance.

"ID" - ACE IS INHERITED

"SA" - SUCCESSFUL ACCESS AUDIT

"FA" - FAILED ACCESS AUDIT

  • rights: A hexadecimal string which denotes the access mask or reserved value, for example: FA (File All Access), FX (File Execute), FW (File Write), etc.
Value Description Value Description
Generic access rights Directory service access rights
"GA" GENERIC ALL "RC" Read Permissions
"GR" GENERIC READ "SD" Delete
"GW" GENERIC WRITE "WD" Modify Permissions
"GX" GENERIC EXECUTE "WO" Modify Owner
File access rights "RP" Read All Properties
"FA" FILE ALL ACCESS "WP" Write All Properties
"FR" FILE GENERIC READ "CC" Create All Child Objects
"FW" FILE GENERIC WRITE "DC" Delete All Child Objects
"FX" FILE GENERIC EXECUTE "LC" List Contents
Registry key access rights "SW" All Validated Writes
"KA" "LO" "LO" List Object
"K" KEY READ "DT" Delete Subtree
"KW" KEY WRITE "CR" All Extended Rights
"KX" KEY EXECUTE
  • object_guid: N/A
  • inherit_object_guid: N/A
  • account_sid: SID of specific security principal, or reserved value, for example: AN (Anonymous), WD (Everyone), SY (LOCAL_SYSTEM), etc. See the table above for more details.

For more information about SDDL syntax, see these articles: https://msdn.microsoft.com/en-us/library/cc230374.aspx, https://msdn.microsoft.com/en-us/library/windows/hardware/aa374892(v=vs.85).aspx.

Security Monitoring Recommendations

For 5145(S, F): A network share object was checked to see whether client can be granted desired access.

Important

  For this event, also see Appendix A: Security monitoring recommendations for many audit events.

  • Monitor this event if the Network Information\Source Address is not from your internal IP range.

  • Monitor this event if the Network Information\Source Address should not be able to connect with the specific computer (Computer:).

  • If you have critical files or folders on specific network shares, for which you need to monitor access attempts (Success and Failure), monitor for specific Share Information\Share Name and Share Information\Relative Target Name.

  • If you have domain or local accounts that should only be able to access a specific list of shared files or folders, you can monitor for access attempts outside the allowed list.

  • We recommend that you monitor for these Access Request Information\Accesses rights (especially for Failure):

    • WriteData (or AddFile)

    • AppendData (or AddSubdirectory or CreatePipeInstance)

    • WriteEA

    • DeleteChild

    • WriteAttributes

    • DELETE

    • WRITE_DAC

    • WRITE_OWNER