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HIPS Settings


  • The host intrusion prevention system (HIPS) constantly monitors system activity. It only allows processes to run if they comply with the security rules in the profile on the endpoint.
  • For example, HIPS protects system-critical files and registry keys from unauthorized modification by malware. 
  • Xcitium Client Security (XCS) ships with a default HIPS ruleset that provides extremely high levels of protection 'out of the box'. You can also create custom rulesets as required.
  • You can configure the feature by adding a HIPS section to a Windows profile.

Configure HIPS


  • Click 'Section'> 'XCS'>’’ > Click 'Edit 
  • Select ‘HIPS Settings’ 'if it does not configure yet. 

You can use the default HIPS settings or import them from a predefined profile:



  • The default settings differ slightly from those in the various profiles. For example, there are two HIPS rules in the security level 1 profile, but there are no rules in the default settings.
  • In either case, you can always modify the HIPS settings later as required.
  • Make your selection then click ‘Ok’.

The HIPS settings screen contains four tabs:


  • HIPS Settings - Configure settings that govern the overall behavior of the HIPS component.
  • HIPS Rules - View and create rules that control the behavior of applications on the managed computer. 
  • Rulesets - View predefined rulesets and create new rulesets. Rulesets can be applied to applications on managed computers. 
  • Protected Objects – A protected object is a collection of items which can be referenced as the target of a HIPS rule. For example, 'Registry Keys' and 'COM Classes'. This interface lets you view and create new protected objects.

HIPS Settings


HIPS Settings - Table of Parameters

Form Element

Description

Enable HIPS

 Activate or deactivate HIPS protection on managed computers to which the profile is applied.


If enabled, you can configure the HIPS security level and monitoring settings.


(Default=Enabled in safe mode)

Hips Security Level

If HIPS is enabled, you can choose the security level for the HIPS to provide at the managed computer from the drop-down below 'Enable HIPS'.




The available options are:

  • Paranoid Mode: This is the highest security level setting and means that HIPS monitors and controls all executable files apart from those that you have deemed safe. Xcitium Client Security does not attempt to learn the behavior of any applications - even those applications on the Xcitium safe list and only uses your configuration settings to filter critical system activity. Similarly, the Xcitium Client Security does automatically create 'Allow' rules for any executables - although the end user still has the option to treat an application as 'Trusted' at the HIPS alert. Choosing this option generates the greatest number of HIPS alerts and is recommended for advanced users that require complete awareness of activity on their system.
  • Safe Mode: While monitoring critical system activity, HIPS automatically learns the activity of executables and applications certified as 'Safe' by Xcitium. It also automatically creates 'Allow' rules for these activities, if the option 'Create rules for safe applications' is selected. For non-certified, unknown, applications, the end-user will receive an alert whenever that application attempts to run. Should you choose, the end-user can add that new application to the safe list by choosing 'Treat this application as a Trusted Application' at the alert. This instructs the HIPS not to generate an alert the next time it runs. If the endpoint is not new or known to be free of malware and other threats, then 'Safe Mode' is recommended setting for most users - combining the highest levels of security with an easy-to-manage number of HIPS alerts.
  • Training Mode: HIPS monitors and learn the activity of any and all executables and create automatic 'Allow' rules until the security level is adjusted. The end-user will not receive any HIPS alerts in 'Training Mode'. If you choose the 'Training Mode' setting, we advise that you are 100% sure that all applications and executables installed on the endpoints are safe to run.
  • Note – If required you can enable training mode to work temporarily. To do that, select 'Temporarily switch HIPS to training mode' option and set the days / hours.


After the countdown is over, XCS will switch back to previous mode and Windows Communication Client continues to synchronize training mode configuration settings that can't change locally.

Monitoring Settings

If HIPS is enabled, you can configure the activities, entities and objects that should monitored by it at the managed endpoint by clicking the 'Monitoring Settings' link.




Activities To Monitor:

  • Interprocess Memory Access - Malware programs use memory space modification to inject malicious code for numerous types of attacks. These include recording your keyboard strokes, modifying the behavior of applications and stealing data by sending confidential information from one process to another. One of the most serious aspects of memory-space breaches is the ability of the offending malware to take the identity of a compromised process to 'impersonate' the application under attack. This makes life harder for traditional virus scanning software and intrusion-detection systems. Leave this option selected, and HIPS generates alerts when an application attempts to modify the memory space allocated to another application (Default = Enabled).

  • Windows/WinEvent Hooks -In the Microsoft Windows® operating system, a hook is a mechanism by which a function can intercept events before they reach an application. Example intercepted events include messages, mouse actions and keystrokes. Hooks can react to these events and, in some cases, modify or discard them. Originally developed to allow legitimate software developers to develop more powerful and useful applications, hooks have also been exploited by hackers to create more powerful malware. Examples include malware that can record every stroke on your keyboard; record your mouse movements; monitor and modify all messages on your computer and take remote control of your computer. Leaving this option selected means that an alert is generated every time a hook is executed by an untrusted application (Default = Enabled).

  • Device Driver Installations - Device drivers are small programs that allow applications and/or operating systems to interact with hardware devices on the managed computer. Hardware devices include your disk drives, graphics card,wireless and LAN network cards, CPU, mouse, USB devices, monitor, DVD player etc. Even the installation of a perfectly well-intentioned device driver can lead to system instability if it conflicts with other drivers on the system. The installation of a malicious driver could, obviously, cause irreparable damage to the computer or even pass control of that device to a hacker. Leaving this option selected means HIPS generates alerts every time a device driver is installed on the computer by an untrusted application (Default = Enabled).

  • Processes' Terminations - A process is a running instance of a program. Terminating a process, obviously, terminates the program. Viruses and Trojan horses often try to shut down the processes of any security software you have been running in order to bypass it. With this setting enabled, HIPS monitors and generates alerts for all attempts by an untrusted application to close down another application (Default = Enabled).

  • Process Execution - Malware such as rootkits and key-loggers often execute as background processes. With this setting enabled, HIPS monitors and generates alerts whenever a process is invoked by an untrusted application. (Default = Enabled).

  • Windows Messages - This setting means Xcitium Client Security monitors and detects if one application attempts to send special Windows Messages to modify the behavior of another application (e.g., by using the WM_PASTE command) (Default = Enabled).

  • DNS/RPC Client Service - This setting generates alerts if an application attempts to access the 'Windows DNS service' - possibly in order to launch a DNS recursion attack.A DNS recursion attack is a type of Distributed Denial of Service attack whereby a malicious entity sends several thousand spoofed requests to a DNS server. The requests are spoofed in that they appear to come from the target or 'victim' server but in fact come from different sources - often a network of 'zombie' computers which send out the requests without the owners knowledge. The DNS servers are tricked into sending all their replies to the victim server - overwhelming it with requests and causing it to crash. Leaving this setting enabled prevents malware from using the DNS Client Service to launch such an attack (Default = Enabled).

Objects To Monitor Against Modifications:

  • Protected COM Interfaces enables monitoring of COM interfaces you specified from the COM Protection pane. (Default = Enabled)

  • Protected Registry Keys enables monitoring of Registry keys you specified from the Registry Protection pane. (Default = Enabled).

  • Protected Files/Folders enables monitoring of files and folders you specified from the File Protection pane. (Default = Enabled).

Objects To Monitor Against Direct Access:


Determines whether or not Xcitium Client Security should monitor access to system critical objects on the managed computer. Using direct access methods, malicious applications can obtain data from a storage device, modify or infect other executable software, record keystrokes and more. Xcitium advises the average user to leave these settings enabled:

  • Physical Memory: Monitors your computer's memory for direct access by an applications and processes. Malicious programs attempt to access physical memory to run a wide range of exploits - the most famous being the 'Buffer Overflow' exploit. Buffer overruns occur when an interface designed to store a certain amount of data at a specific address in memory allows a malicious process to supply too much data to that address. This overwrites its internal structures and can be used by malware to force the system to execute its code (Default = Enabled).

  • Computer Monitor: Xcitium Client Security raises an alert every time a process tries to directly access the computer monitor. Although legitimate applications sometimes require this access, spyware can also use such access to take screen shots of the current desktop, record browsing activities of the user and more (Default = Enabled).

  • Disks: Monitors the local disk drives at the managed computer, for direct access by running processes. This helps guard against malicious software that need this access to, for example, obtain data stored on the drives, destroy files on a hard disk, format the drive or corrupt the file system by writing junk data (Default = Enabled).

  • Keyboard: Monitors the keyboard for access attempts. Malicious software, known as 'key loggers', can record every stroke made on keyboard and can be used to steal passwords, credit card numbers and other personal data typed through the keyboard. With this setting is enabled, Xcitium Client Security generates alerts every time an application attempts to establish direct access to the keyboard (Default = Enabled).

Note: The settings you choose here are universally applied. If you disable monitoring of an activity, entity or object using this interface it completely switches off monitoring of that activity on a global basis - effectively creating a universal 'Allow' rule for that activity . This 'Allow' setting over-rules any Ruleset specific 'Block' or 'Ask' setting for that activity that you may have selected using the 'Access Rights' and 'Protection Settings' interface.

Do NOT show popup alerts

Configure whether or not the HIPS alerts are to be displayed at the managed computer for the end-user to respond. Choosing 'Do NOT show popup alerts' will minimize disturbances but at some loss of user awareness (Default = Enabled).


If you choose not to show alerts, then you have a choice of default responses that XCS should automatically take - either 'Block Requests' or 'Allow Requests'.



Set popup alerts to verbose mode

Enabling this option instructs XCS to display HIPS alerts in verbose mode, providing more more informative alerts and more options for the user to allow or block the requests (Default = Enabled).

Create rules for safe applications

XCS will auto-create allow rules for known-safe applications. (Default = Disabled) . It is disabled by default for all predefined Endpoint Manager profiles.

Note: HIPS trusts an application if:
  • The app is from a vendor who has a 'Trusted' status in the local vendor list in XCS
  • The app is trusted in the online file database (aka, it is whitelisted)
  • The app is trusted in the local XCS ‘File List’
See File Rating Settings for more details.

Erase automatically created rules when settings are updated  When this option is enabled, if any HIPS configuration is updated and pushed on the endpoint, all automatically generated HIPS rules on the endpoint will be deleted. (Default = Disabled)

Set new on-screen alert timeout to

Determines how long the HIPS shows an alert for without any user intervention. By default, the timeout is set at 60 seconds. You may adjust this setting to your own preference.

Advanced Settings

Enable adaptive mode under low system resources

Very rarely (and only in a heavily loaded system), low memory conditions might cause certain XCS functions to fail. With this option enabled, XCS will attempt to locate and utilize memory using adaptive techniques so that it can complete its pending tasks. However, the cost of enabling this option may be reduced performance in even lightly loaded systems. (Default = Enabled)

Block unknown requests when the application is not running

Selecting this option blocks all unknown execution requests if Xcitium Client Security is not running/has been shut down. This is option is very strict indeed and, in most cases, should only be enabled on seriously infested or compromised machines while the user is working to resolve these issues. If you know the managed computer machine is already 'clean' and are looking just to enable the highest XCS security settings, then it is OK to leave this option disabled. (Default = Disabled)


Enable enhanced protection mode (Requires a system restart)

 64-bit systems only. Activate additional protections which counteract sophisticated malware that tries to bypass regular HIPS protection. Because of limitations in Windows 7/8 x64 systems, some HIPS functions in previous versions of XCS could theoretically be bypassed by malware. Enhanced Protection Mode implements several patent-pending ways to improve HIPS. The endpoint requires a restart to enable enhanced protection mode. (Default = Disabled)

 

HIPS Rules


The 'HIPS Rules' screen allows you to view the list of active HIPS rulesets applied to different groups of or individual applications and to create and manage rules for the profile. You can change the ruleset applied to a selected application or application group.


Note: HIPS Rulesets are to be created before applying them to an individual application or an application group. Refer to the next section Rulesets for details on creating new rulesets.



HIPS Rules – Column Descriptions

Column Header

Description

Application

Name of the individual application or the application group to which the ruleset is applied.

Treat As

The ruleset applied. For more details on the rulesets, refer to the next section Rulesets.

Actions

Contains control buttons to edit or remove the rule


Create and Modify Hips Rules


To begin defining an application's HIPS rule, you need take two basic steps.


Step 1 - Select the application that you wish the ruleset is to be applied


  • To define a ruleset for a new application (i.e., one that is not already listed), click the 'Add Rule' button at the top of the list in the 'HIPS Rules' interface.

The 'HIPS Rule' interface will open as shown below:



Because this is a new application, the 'Name' field is blank. (If you are modifying an existing rule, then this interface shows the individual rules for that application's ruleset).


  • To create a rule for a single application, enter the file name of it in the 'Name' field
  • To create a rule for an application group, select 'Use Group' and choose the file group from the drop-down



Note: Endpoint Manager ships with a set of predefined file groups containing collections of files under respective categories. Admins can also create custom file groups with required applications. All the pre-defined and the custom file groups will be available in the drop-down. The custom file groups can be created under 'Settings' > 'System Templates' > 'File Groups Variables' interface. See Create and Manage File Groups for more details. for more details. 


Step 2 - Configure the rules for this application's ruleset


There are two broad options available for creating a ruleset that applies to an application - Use a Predefined Ruleset or Use a Custom Ruleset.


  • Use a Predefined Ruleset - Allows you to quickly deploy an existing HIPS ruleset on to the target application. Choose the ruleset you wish to use from the drop-down menu. The name of the predefined ruleset you choose is displayed in the 'Treat As' column for that application in the 'HIPS Rules' interface.



Note: Predefined Rulesets, once chosen, cannot be modified directly from this interface - they can only be modified and defined using the Ruleset interface. If you require the ability to modify components of the rule set, then you are effectively creating a new, custom ruleset and should choose the more flexible Use Custom Ruleset option instead.


  • Use a Custom Ruleset - Designed for more experienced administrators, the 'Custom Ruleset' option grants full control over the configuration of each rule within that ruleset. The custom ruleset has two main configuration areas - Access Rights and Protection Settings. (Default = Enabled)



In simplistic terms 'Access Rights' determine what the application can do to other processes and objects whereas 'Protection Settings' determine what the application can have done to it by other processes.


  1. Access Rights - The 'Process Access Rights' area allows you to determine what activities can be performed by the applications in your custom ruleset.




See HIPS Settings > Activities to Monitor to view a list of definitions of the Action Names listed above and the implications of choosing the action from 'Ask', 'Allow' or 'Block' for each setting as shown below:

  • Exceptions to your choice of 'Ask', 'Allow' or 'Block' can be specified for the ruleset by clicking the 'Modify' link on the right.
  • Select the 'Allowed Files/Folders' or 'Blocked Files/Folders' tab depending on the type of exception you wish to create.




  • Click the 'Add' button at the top to choose which applications or file groups you wish this exception to apply to. (click here for an explanation of available options).
  1. Protection Settings - Protection Settings determine how protected the application or file group in your ruleset is against activities by other processes. These protections are called 'Protection Types'.



  • Select 'Active' to enable monitoring and protect the application or file group against the process listed in the 'Protection State' column. Select 'Inactive' to disable such protection.

Click here to view a list of definitions of the 'Protection Types' listed above and the implications of activating each setting.


Exceptions to your choice of 'Active' or 'Inactive' can be specified in the application's Ruleset by clicking the 'Modify' link on the right.

  • Click 'OK' to confirm your settings.


Rulesets


A Pre-defined ruleset is a set of access rights and protection settings that has been saved and can be re-used and deployed on multiple applications or groups. Each ruleset is comprised of a number of rules and each of these rules is defined by a set of conditions/settings/parameters. Rulesets concern an application's access rights to memory, other programs, the registry etc.


The Rulesets screen under the the 'HIPS' tab displays the list of rulesets and allows you to add and manage new rulesets.




Add a new ruleset


  • Click the 'Add Ruleset' button above the list of rulesets.
The 'HIPS Ruleset' dialog will appear.




  • Enter a name for the ruleset
  • Configure the Actions, states and exclusions for 'Access Rights' and 'Protection Settings' as explained above. Any changes you make here are automatically rolled out to all applications that are covered by the ruleset. The new ruleset will be available for deployment to HIPS rule for applications/application groups from the HIPS Rules interface
  • To edit a ruleset, click the Edit button under the Actions in the Rulesets interface. The Editing process is similar to the Ruleset creation process explained above.


Protected Objects


The 'Protected Objects' panel under 'HIPS' tab lets you specify items at the managed computers to be protected against access or modification by unauthorized processes and services. These include files and folders, system critical registry keys and COM interfaces.


 

The 'Show' drop-down allows you to choose the category of protected objects to be displayed in the list and add and manage the protected objects of that category. You can add following categories of protected objects:


  • Protected Files - Allows you to view and specify programs, applications, files an file groups that are to be protected from changes
  • Registry Keys - Allows you to view and specify registry keys that are to be protected from changes
  • COM Interfaces - Allows you to view and specify COM interfaces that are to be protected from changes


Protected Files

 

The 'Protected Files' list under 'Protected Objects' interface allows you to view and manage list of files and file groups that are to be protected from access by other programs, especially malicious programs such as virus, Trojans and spyware at the managed computer. It is also useful for safeguarding very valuable files (spreadsheets, databases, documents) by denying any user and any program the ability to modify the file - avoiding the possibility of accidental or deliberate sabotage. If a file is 'Protected' it can still be accessed and read by users, but not altered. A good example of a file that ought to be protected is your 'hosts' file (c:/windows/system32/drivers/etc/hosts). Placing this in the 'Protected Files and Folders' area would allow web browsers to access and read from the file as per normal. However, should any process attempt to modify it then Xcitium Client Security blocks this attempt and produces a 'Protected File Access' pop-up alert.


If you add a file to 'Protected Files', but want to allow trusted application to access it, then rules can be defined in HIPS Rulesets. See adding 'Exceptions' at the end of this section for more details about how to allow access to files placed in Protected Files.


  • To view the list of Protected Files, choose 'Protected Files' from the 'Show' drop-down in the 'Protected Objects' interface



The Protected File list is displayed under two categories, which can be selected from the drop-down at the right.



  • To view the list of individual files, programs, applications added to the Protected Files list and manage them, choose 'File List'
  • To view the File Groups added to the Protected File list, choose 'Group List'

You can add individual files, programs, applications or file/groups to 'Protected Files'.


Add an individual file, program or an application


  • Choose 'File List' from the drop-down at the right and click the 'Add File Path' button.




  • Enter the installation/storage path with file name of the file to be protected, in the managed computers, in the 'Add Protected File Path' dialog and click 'OK'.
  • Repeat the process to add more files.
  • To edit the path of an item in the list, click the Edit icon under the 'Actions' in the list.
  • To remove an item from the list, click the thrash can icon under 'Actions' in the list

Add an application/file group to the Protected Files list


  • Choose 'Group List' from the drop-down at the right and click the 'Add Protected Group' button




  • Choose the file group from the drop-down and click 'OK'.


Note: Endpoint Manager ships with a set of predefined file groups containing collections of files under respective categories. You can also create custom file groups with required applications. All the pre-defined and the custom file groups will be available in the drop-down. The custom file groups can be created under 'Settings' > 'System Templates' > 'File Groups Variables' interface. See Create and Manage File Groups for more details. 


  • Repeat the process to add more file groups.
  • To edit the path of an item in the list, click the Edit icon under the 'Actions' in the list.
  • To remove an item from the list, click the thrash can icon under 'Actions' in the list

Exceptions


You can choose to selectively allow another application (or file group) to modify a protected file by affording the appropriate 'Access Right' in 'HIPS Rules' interface. A simplistic example would be the imaginary file 'Accounts.ods'. You would want the 'Open Office Calc' program to be able to modify this file as you are working on it, but you would not want it to be accessed by a potential malicious program. You would first add the spreadsheet to the 'Protected Files' area. Once added to 'Protected Files', you would go into 'HIPS Rules' and create an exception for 'scalc' so that it alone could modify 'Accounts.ods'.


  • First add Accounts.ods to 'Protected Files' area as explained above.
  • Then go to 'HIPS Rules' interface and add it to the list of applications.
  • In the 'HIPS Rule' interface, enter the file name as account.ods, choose 'Use a Custom Ruleset' and select a ruleset from the 'Copy From' drop-down.
  • Under 'Access Rights' tab, set all the rules to 'Ask'




  • Click the 'Modify' beside 'Protected File/Folders'
  • Under the 'Access Rights' section, click the link 'Modify' beside the entry 'Protected Files/Folders'.

The 'Protected Files/Folders' interface will appear.


  • Under the 'Allowed Files/Folders' section, click 'Add' > 'Files' and add scalc.exe as exceptions to the 'Ask' or 'Block' rule in the 'Access Rights'.




Another example of where protected files should be given selective access is the Windows system directory at 'c:/windows/system32'. Files in this folder should be off-limits to modification by anything except certain, Trusted, applications like Windows Updater Applications. In this case, you would add the directory c:windowssystem32* to the 'Protected Files area (* = all files in this directory). Next go to 'HIPS Rules', locate the file group 'Windows Updater Applications' in the list and follow the same process outlined above to create an exception for that group of executables.


Registry Keys


The 'Registry Keys' list under 'Protected Objects' interface allows you to view and manage list of critical registry keys and registry groups to be protected against modification. Irreversible damage can be caused to the managed endpoint if important registry keys are corrupted or modified in any way. It is essential that the registry keys are protected against any type of attack.


To view the list of Protected Registry Keys, choose 'Registry Keys' from the 'Show' drop-down in the 'Protected Objects' interface.



The Protected Registry Keys list is displayed under two categories, which can be selected from the drop-down at the right.


  • To view the list of individual keys and values, and manage them, choose 'Key List'

  • To view the Registry Groups, choose 'Group List'


You can add individual registry keys and Registry groups to Protected Registry Keys list.


Add an individual key


  • Choose 'Key List' from the drop-down at the right and click the 'Add Registry Key' button.




  • Enter the key name to be protected in the 'Add Registry Key' dialog and click 'OK'.
  • Repeat the process to add more keys.
  • To edit an item in the list, click the 'Edit' icon under the 'Actions' in the list.
  • To remove an item from the list, click the thrash can icon under 'Actions' in the list

Add a Registry group to the Protected Registry Keys list


  • Choose 'Group List' from the drop-down at the right and click the 'Add Protected Files' button




  • Choose the Registry group from the drop-down and click 'OK'.


Note: Endpoint Manager ships with a set of predefined Registry groups containing collections of registry keys under respective categories. You can also create custom Registry groups with required key values. All the pre-defined and the custom Registry groups will be available in the drop-down. The custom Registry groups can be created under 'Settings' > 'System Templates' > 'Registry Variables' interface. See Create and Manage Registry Groups for more details.


  • Repeat the process to add more Registry groups.
  • To edit the an item in the list, click the Edit icon under the 'Actions' in the list.
  • To remove an item from the list, click the thrash can icon under 'Actions' in the list

COM Interfaces


Component Object Model (COM) is Microsoft's object-oriented programming model that defines how objects interact within a single application or between applications - specifying how components work together and inter-operate. COM is used as the basis for Active X and OLE - two favorite targets of hackers and malicious programs to launch attacks on a computer. It is a critical part of any security system to restrict processes from accessing the Component Object Model - in other words, to protect the COM interfaces.


The 'COM Interfaces' list under 'Protected Objects' interface allows you to view and manage list of individual COM classes and COM groups that are to be protected by the Xcitium Client Security at the managed computer against modification, corruption and manipulation by malicious processes.


View the list of Protected COM interfaces 


  • Choose 'COM Interfaces' from the 'Show' drop-down in the 'Protected Objects' interface 

The Protected COM Interfaces list is displayed under two categories, which can be selected from the drop-down at the right.



  • To view the list of individual COM Interfaces/Classes and manage them, choose 'Classes List'
  • To view the COM Groups and manage them, choose 'Group List'


You can add individual COM Interfaces/Classes and/or pre-defined COM groups to 'Protected COM Objects' list.


Add an individual COM object


  • Choose 'Classes List' from the drop-down at the right and click the 'Add COM Class' button




  • Click ‘Add’
  • Repeat the process to add multiple procedures to the profile
  • Click 'Save' to add the procedures to the profile
  • To remove an item from the list, click the trash can icon under 'Actions' in the list

Add a predefined COM Group to the Protected COM objects list


  • Choose 'Group List' from the drop-down at the right and click the 'Add COM Group' button




  • Choose the file group from the drop-down and click 'OK'.

Note: Endpoint Manager ships with a set of predefined COM groups containing collections of COM interfaces under respective categories. You can also create custom COM groups with required COM objects. All the pre-defined and the custom file groups will be available in the drop-down. The custom COM groups can be created under 'Settings' > 'System Templates' > 'COM Variables' interface. See Create and Manage COM Groups for more details.


  • Repeat the process to add more COM groups.
  • To edit an item in the list, click the Edit icon under the 'Actions' in the list.
  • To remove an item from the list, click the thrash can icon under 'Actions' in the list.