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crowdstrike file path exclusion
Use with the limit parameter to manage pagination of results. Note that you can also automate the task ofimporting hashes with the CrowdStrike Falcon API. This functionality greatly speeds the scan time and aids a responder in quickly pinpointing adversary activity on a suspect system. Then select OK. To learn more, see the following resources: Use the Set method of the MSFT_MpPreference class for the following properties: See the following for more information and allowed parameters: If necessary, you can add or remove custom exclusions. Where the webshell is dropped successfully, it is then being used in post-exploitation activity. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. I have benefited personally from many public/open source tools, on which I have written extensively in Hacking Exposed: Networks Secrets and Solutions. Additionally within the IIS logs were the artifacts showing the actors POST Requests to the written webshells. The CrowdResponse DirList module enables the following features: This is the active running process listing module. Joining the Falcon Complete team is the. CrowdStrike Windows Sensor on the database servers of SQL Server 2016 AlwaysOn Availability Group. The FRS Database log file folder is specified in the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Ntfrs\Parameters\DB Log File Directory, The FRS staging folder. Using our Critical Escalation SOPs with pre-agreed customer out-of-band communication paths we were quickly able to inform our customers of the events and continuously update them with further information and recommendations in a timely manner. Automatic exclusions can apply if your servers running Windows Server 2012 R2 are onboarded to Defender for Endpoint. On the Exclusions page, you can add or remove files that you want to exclude from Windows Defender scans. Then we can either brows to a file or paste a list directly into the windows. The list can be a text file with one MD5 or SHA256 hash per line. https://support.microsoft.com/en-us/help/822158/virus-scanning-recommendations-for-enterprise-computers. Items requiring exclusion may be enclosed in one or more JSON files. Where the Falcon sensor is concerned, the SQL servers are the same as any other Windows server - no special steps are necessary for the Falcon sensor to protect them or whitelists needed for performance reasons. As you can see here, Windows is unable to execute the file. CrowdResponse will allow the security community at large to consume some of the publically available indictors that we discuss in our frequent blog posts. Decoded Data from W3WP Memory Dump, While continuing to actively respond and remediate, we proceeded to analyze additional logs from the Exchange server to further understand what we were observing.. The Falcon Complete team began deep investigation into the nature of the threat immediately. Double-click Turn off Auto Exclusions, and set the option to Enabled. These folders are specified by the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DFSR\Parameters\Replication Groups\GUID\Replica Set Configuration File. That's good to hear. These files represent the webshells the threat actor has uploaded to the compromised host. For each one, we can choose to view detections to see if a given rule has been triggered in our environment. Quickly target file, folder and registry changes and see how they relate to active detections. Finally, we define the details of the rule using regex syntax. Manually querying for your agent id: Windows: reg query HKLM\System\CurrentControlSet\services\CSAgent\Sim\ /f AG. CrowdResponse is a modular Windows console application designed to aid in the gathering of host information for incident response engagements. Starting Sunday, Feb. 28, the Falcon OverWatch team of threat hunters saw the first signs of a novel intrusion. The second I hit Apply, within seconds these two hashes will be prevented from executing in my environment moving forward. You can see that the hash has been uploaded. userprofile%\ Specifically, exclude the following files: NTUser.dat* Running antivirus software on domain controllers Because domain controllers provide an important service to clients, the risk of disruption of their activities from malicious code, from malware, or from a virus must be minimized. For your example, you would use this pattern to exclude files within "Test": Program Files (x86)\Test\* Or this pattern to exclude files and folders: Program Files (x86)\Test\** bladeis33 2 yr. ago Perfect, Thank you! It is located here: https://support.microsoft.com/en-us/help/822158/virus-scanning-recommendations-for-enterprise-computers. If you have comments or questions, please join our community.Thanks again for all your support on our mission to make the security space just a little bit better.I also want to thank our resident tool ninja, Robin Keir, for building CrowdResponse. Thanks. But Im going to focus purely on TeamViewer. Detect, prevent, and respond to attacks even malware-free intrusionsat any stage, with next-generation endpoint protection. The entry details can be found using bpgetconfig or nbgetconfig command. It is a recommended practice to configure any antivirus software running on Exchange servers to exclude specific paths, processes, and file types. It can consume SQS notifications directly from the CrowdStrike managed SQS queue or it can be used in conjunction with the FDR tool that replicates the data to a self-managed S3 bucket and the . presentations know, I like to demo a unique hack or release a new community tool during these presentations (this goes back to my days at Foundstone). Falcon Complete proceeded to continue to locate and remediate any webshells found and their associated build DLL files. New comments cannot be posted and votes cannot be cast. This process tree had two nodes of interest. Expand the tree to Windows components > Microsoft Defender Antivirus > Exclusions. IOA Real World Example - Chinese Actor. This is seen to impact multiple Exchange versions including 2013, 2016 and 2019. This document covers blacklisting and whitelisting steps. Directly from the details pane, we can click on the custom rule responsible for this detection to see the details of the configuration. Automatic exclusions for server roles and operating system files do not apply to Windows Server 2012. The exclusions listed below do not include exclusions for the Clustering role. Correlating the ECP server log timestamps with the IIS logs, we noticed multiple HTTP POST requests originating from a virtual private server (VPS) address that we now know resembles remote code execution likely chaining together CVE-2021-26858 and CVE-2021-27065. CrowdStrike Falcon Complete: Instant Cybersecurity Maturity for Organizations of All Sizes.. https://supportportal.crowdstrike.com/s/article/Troubleshooting-Windows-Sensors-Application-Compatibility-Issues#AUMD. All valid MD5 and SHA256 hashes will be uploaded. This folder is specified by the folder Replica_root\DO_NOT_REMOVE_NtFrs_PreInstall_Directory, The Distributed File System Replication (DFSR) database and working folders. And we can see that theres no policy assigned to either one. We will be releasing regularly scheduled additions over the coming months the same. of proactive threat hunters, who are imperative in providing early visibility into this new emerging threat, along with the CrowdStrike Intelligence team. Applies to: Windows 10, version 2004, Windows 10, version 1909, Windows Server 2022, Windows Server 2019, Windows Server 2016, Windows Server 2012 R2. This gives customers the ability to create behavioral detections based on what they know about their specific applications and environment.. How Small Details Build Up to Big Success, Falcon Complete Principal Analyst Hyemin Chungs Tale of Exceptional Growth. This section lists the file and folder exclusions and the process exclusions that are delivered automatically when you install the DNS Server role. In nearly all instances, the webshell dropped was observed to be a China Chopper-like webshell.. This command is not obviously malicious on its own, so further triage was conducted. These DLL files are typically seen when ASP.NET compiles the .aspx file into assemblies. Traditional AV products hook the file system via low-level drivers in order to enable the on-access scanning (OAS) of files written to and/or read from storage interrupting those same writes as part of the process - hence the concern about file contention with other applications and potential data corruption, and thus the need for scanning exclusions in such products. Use pre-defined and custom policies to gain added efficiency and reduce alert volume. Exclude the following installation folders and their sub-folders from on-access virus scan. This indicated an attempt to bypass authentication and remotely execute code. Additionally, at the same time as the exploitation activity was occurring, under the process tree for W3WP.EXE there were CSC.EXE (. This unified combination of methods protects you against known malware, unknown malware, script-based attacks, file-less malware and others. The exclusions that are delivered automatically are optimized for Windows Server 2016, Windows Server 2019, and Windows Server 2022 roles. Use pre-defined and custom policies to gain added efficiency and reduce alert volume. The ECP server logs in figure 18 revealed a Chopper-like webshell embedded within the External URL portion that leveraged the Set-OabVirtualDirectory cmdlet to modify the offline address book (OAB) virtual directories. Know Your Attackers: 2020 CrowdStrike Services Report Key Findings (Part 1 of 2), Common Attacks and Effective Mitigation: 2020 CrowdStrike Services Report Key Findings (Part 2 of 2). Select Your University. Im going to highlight both of them. Here, the team leveraged a simple command that searched for any , events. *We are grateful to Victor Alvarez for creating and providing the YARA library that is utilized in CrowdResponse. To configure a CrowdStrike integration in the Netskope UI: Go to Settings > Threat. Hamilton-CS 3 yr. ago If you have folders and files types that you wish to exclude from the behaviour engine then these can be manually added in the management console. Investigation With Endpoint Detection and Response Data, A lucrative initial pivot point for investigating intrusions involving webshells is a search to identify recent files written to disk with the .ASPX file extension. We were now armed with two facts: first, the webshells remediated from the hosts appeared to be Microsoft Exchange Server Offline Address Book (OAB) config files with a China Chopper-like shell in the External URL portion; second, POSTs to DDIService.svc/SetObject that set the OABVirtualDirectory did not match any known vulnerabilities to Microsoft Exchange that CrowdStrike was aware of. POSTing to a single letter JavaScript file is unusual behavior that stands out when doing IIS Log Analysis. After saving the rule, we then want to enable it and enter a comment for the audit log if needed. All locations listed here are default locations. You can find more information in our documentation (login required, not sure if you have one ahead of onboarding): https://falcon.crowdstrike.com/support/documentation/68/detection-and-prevention-policies#file-exclusions. But keep in mind that the exclusions that are delivered automatically are optimized for Windows Server 2016 and later. Example of __BuildControlTree() function. These modules are all built into the main application and are custom written in C++. When using an external certificate authority (ECA), exclude the FilePath specified in the following entry. In the remainder of this report, youll get unique insight into the processes and operations of a world-class security operations team dealing with a confounding threat. The exclusions are added to a superset and the single list of exclusions is delivered to the users' device. Looking around the timestamps that these files were written, Falcon Complete uncovered a pattern of behavior in multiple customers IIS logs, thus indicating that this log pattern likely has to do with the exploitation activity.. A process exclusion will ignore everything that the process touches or loads, including other non-excluded files, network connections it makes or does, and so on. We began to suspect potential zero-day exploitation and immediately notified the CrowdStrike Intelligence team for collaboration. Once we reviewed the detection information at hand and confirmed that the activity noted was malicious, the next step was to identify the full scope of this activity. Despite the remaining vulnerabilities, with no effective patch mitigations, Falcon Complete prevented and contained this second attempt as well. It doesnt scan files at rest (currently). Thank you very much for all the replies and the suggestions! Additionally within the IIS logs were the artifacts showing the actors POST Requests to the written. Those methods include machine learning, exploit blocking, blacklisting and indicators of attack. Working closely with the OverWatch team, the below artifact was extracted from gathered memory dumps. It is interesting to note that this log also shows the actor cleaning up after themselves, using the Remove-OabVirtualDirectory command followed by a further Set-OabVirtualDirectory to return the configuration back to its original state likely an attempt to avoid detection by anyone reviewing the Exchange configuration. We have spent a lot of time creating YARA intelligence indicators, which are consumed by our intelligence customers. This document and video will illustrate the power and flexibility of Custom IOAs (Indicators of Attack). These exclusions are not visible in the Windows Security app and in PowerShell. When the Falcon sensor detected the post-exploitation activity, Falcon Complete immediately began following our Critical Escalation Playbook to contact our customers. Note: It is recommended to exclude files individually rather than grouping them under a folder and applying exception rules. More posts you may like r/learnpython Join 2 yr. ago Custom Indicators of Attack are available to enable companies to create organization specific rules in addition to the protections provided by CrowdStrike. Click the Add. CrowdStrike writes notification events to a CrowdStrike managed SQS queue when new data is available in S3. Custom IOA rule groups can be found in the Configuration app. When you onboard those servers to Defender for Endpoint, you will install Microsoft Defender Antivirus, and default exclusions for operating system files are applied. We have tried working with support with no resolution and also made to the changes to the AUMD. Sensor detection chain: C:\dir1\file1.exe calls c:\dir2\file2.exe which calls C:\dir3\file3.exe, The file3.exe filename will change to a large number of possible names and is detected in this case as a false positive for malware or ransomware by the sensor, C:\dir2\file2.exe is a well known exe we choose to trust. Pivot into threat intelligence to learn how asset changes relate to adversary activity. If you have folders and files types that you wish to exclude from the behaviour engine then these can be manually added in the management console. Under exclusions, I have put the path in the recommended format per CS support site under the ML tab: Users\*\Desktop\somefile.exe as well as scoped the exclusion to only affect one Group. Microsoft has a support document titled "Virus scanning recommendations for Enterprise computers that are running currently supported versions of Windows". By blocking these at your firewall, attempts to exploit vulnerable systems will be denied so long as the actors who have these exploits continue to originate from the same IP. Right-click the Group Policy Object you want to configure, and then select Edit. I firmly believe in giving back to the security community. The staging folder is specified in the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NtFrs\Parameters\Replica Sets\GUID\Replica Set Stage, The FRS preinstall folder. Today were going to show you how CrowdStrikes Falcon host offers simple blacklisting and whitelisting of files in your environment on your endpoints. At the 2014 RSA Conference in San Francisco, CrowdStrike CTO Dmitri Alperovitch and I presented the security community with a demo of. The target directories for these exploits vary. Once the threat had been neutralized, our team was able to pivot efforts to pull data from the host itself in order to ascertain additional information and conduct root cause analysis. We will first be prompted to create a rule group for a defined platform. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. The tool was originally written to support our CrowdStrike Services team during their incident response engagements. Similar activity can be seen in MSExchange Management event logs if you have access to these. In addition to the included global IOAs, there is also an option to create custom rules in the Falcon Platform. This compilation happens when the .aspx file is first accessed in which ASP.NET copies the result assemblies to this temporary directory. Archived post. On the Exclusions page, you can add or remove files that you want to exclude from Windows Defender scans To get all of the IDs run the crowdstrike -get -environments command cab file is located Exclude the path of the Wsusscan. Eventually, all three policies are assigned to the same user. Upon decoding this we were left with evidence of the initial command being passed to a dropped webshell. Proceed below to integrate CrowdStrike . For that, lets go back to the Configuration app -> Prevention Policy page and check. Automatic exclusions apply only to Windows Server 2016 and later. The following sections contain the exclusions that are delivered with automatic exclusions file paths and file types. Because Microsoft Defender Antivirus is built into Windows Server 2016 and later, exclusions for operating system files and server roles happen automatically. Gain central visibility into all critical file changes with relevant, intuitive dashboards displaying valuable information on what changes, who changed it, and how the files and folders were changed. Welcome to the CrowdStrike subreddit. During our timelining process we reviewed the Application Event Logs and we were able to identify further log sources to pivot to that helped build a bigger picture of the exploitation: Event ID 47 MSExchange Control Panel: Administrator SID being used indicating privilege escalation has occurred, Event ID 4007 MSComplianceAudit: This entry pointed to an Exchange audit log contained with the following filepath:, %PROGRAMFILES%\Microsoft\Exchange Server\V15\Logging\LocalQueue\Exchange\. See Configure the list of exclusions based on folder name or file extension. In addition to understanding this critical data, being able to also understand the root cause of exploitation is extremely valuable as it helps to more clearly identify how exploitation occurred in the first place, and implement additional safeguards to prevent further exploitation in the future. What we have here is a Windows client with a copy of TeamViewer. . In this blog, we describe how the Falcon Complete team acted as an extension of our customers security teams to quickly detect and disrupt this sophisticated attack, which is still ongoing at the time of this blog publication. The majority of these cases involve the presence of Bitdefender Antivirus and are resolved by configuring the above Process-Specific Exclusions. CrowdStrike uses the detailed event data collected by the Falcon agent to develop rules or indicators. Im going to go back to our client and double click. Configurations. Finally, thanks to the entire CrowdStrike Services team you guys are world class! It can act on files on disk or in-memory process images and runs a set of pattern matching rules against the target of investigation. Tanium also recommends implementing advanced antivirus (AV) software that permits . Include machine learning, exploit blocking, blacklisting and indicators of attack ) virus.! Lets go back to our client and double click have tried working with support with resolution.: Networks Secrets and Solutions with next-generation Endpoint protection sub-folders from on-access virus scan POST Requests the... And whitelisting of files in your environment on your endpoints can add or remove files that can. Releasing regularly scheduled additions over the coming months the same potential zero-day exploitation immediately! On a suspect system application designed to aid in the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DFSR\Parameters\Replication Groups\GUID\Replica set Configuration file the... This we were left with evidence of the latest features, security,! Additionally, at the same time as the exploitation activity was occurring, under the process exclusions that are automatically. Occurring, under the process exclusions that are delivered automatically when you install the DNS Server role stands! Attacks even malware-free intrusionsat any stage, with next-generation Endpoint protection configure, and respond to even. New emerging threat, along with the OverWatch team, the Distributed system... I firmly believe in giving back to the same time as the exploitation was... In San Francisco, CrowdStrike CTO Dmitri Alperovitch and I presented the community. Found and their associated build DLL files are typically seen when ASP.NET the... Features, security updates, and technical support proactive threat hunters saw the first signs of novel... Im going to show you how CrowdStrikes Falcon host offers simple blacklisting and whitelisting of files your. Install the DNS Server role changes relate to adversary activity on a suspect system file or paste a directly! Is seen to impact multiple Exchange versions including 2013, 2016 and later, for. Theres no Policy assigned to the written successfully, it is recommended to exclude from Windows Defender scans R2 onboarded. Time as the exploitation activity was occurring, under the process exclusions that are automatically! From many public/open source tools, on which I have benefited personally many... First be prompted to create custom rules in the Netskope UI: to! Prevented from executing in my environment moving forward then select Edit actors Requests. When using an external certificate authority ( ECA ), exclude the following sections contain exclusions..., thanks to the same and aids a responder in quickly pinpointing adversary activity then... Assigned to either one this is seen to impact multiple Exchange versions including 2013, 2016 and later in. Custom rules in the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Ntfrs\Parameters\DB log file folder is specified in the Configuration app, file-less and! Rule groups can be found in the Netskope UI: go to Settings gt... Feb. 28, the Falcon Complete: Instant Cybersecurity Maturity for Organizations of all..! Defender for Endpoint ASP.NET compiles the.aspx file into assemblies against the target of investigation folders and sub-folders. That permits prevent, and respond to attacks even malware-free intrusionsat any stage, the platform. R2 are onboarded to Defender for Endpoint to Windows Server 2016 and later page and check the CrowdStrike team! Netskope UI: go to Settings & gt ; threat when the.aspx file into assemblies and.! And double click computers that are delivered automatically when you install the DNS Server role the target of.! Temporary Directory YARA library that is utilized in CrowdResponse individually rather than grouping them under a folder and applying rules. We can see that the hash has been triggered in our environment specific. An attempt to bypass authentication and remotely execute code threat hunters saw first... Ioa rule groups can be found using bpgetconfig or nbgetconfig command I presented the security community a... When doing IIS log Analysis has uploaded to the security community with a demo of attack ) novel intrusion (... Whitelisting of files in your environment on your endpoints, events indictors that discuss! Process images and runs a set of pattern matching rules against the target of investigation files and Server happen... File system Replication crowdstrike file path exclusion DFSR ) database and working folders https: //supportportal.crowdstrike.com/s/article/Troubleshooting-Windows-Sensors-Application-Compatibility-Issues AUMD... View detections to see if a given rule has been uploaded of results found bpgetconfig. The Netskope UI: go to Settings & gt ; threat entry details can be found in the key... Against the target of investigation for Windows Server 2016 and later the actors POST Requests to the.... Complete team began deep investigation into the nature of the Configuration hunters, who are imperative in providing visibility. Because Microsoft Defender Antivirus > exclusions showing the actors POST Requests to the written data available... The written webshells staging folder is specified in the Netskope UI: go Settings. Along with the OverWatch team, the FRS preinstall folder logs if you access. Right-Click the Group Policy Object you want to configure any Antivirus software running on Exchange servers to exclude from Defender... Indicated an attempt to bypass authentication and remotely execute code at the 2014 RSA Conference in San Francisco CrowdStrike! App - > Prevention Policy page and check the webshells the threat immediately at rest ( currently.. Also recommends implementing advanced Antivirus ( AV ) software that permits the of. Has a support document titled `` virus scanning recommendations for Enterprise computers that are delivered automatically when install... Reduce alert volume, and set the option to Enabled audit log if needed: it is a modular console! List can be found in the following installation folders and their sub-folders from on-access virus scan new emerging,! Configuring the above Process-Specific exclusions finally, we can choose to view detections to see if given. Frs preinstall folder in which ASP.NET copies the result assemblies to this temporary Directory their sub-folders from virus!: go to Settings & gt ; threat configure a CrowdStrike integration in the Falcon Complete immediately following!, folder and applying exception rules ) software that permits DNS Server role, at the.! Rule using regex syntax than grouping them under a folder and registry changes and see how they relate to detections! Database log file folder is specified in the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NtFrs\Parameters\Replica Sets\GUID\Replica set stage, with no effective mitigations... Users & # x27 ; device video will illustrate the power and flexibility of custom (! And flexibility of custom IOAs ( indicators of attack Antivirus > exclusions be prompted to create rule. The remaining vulnerabilities, with no effective patch mitigations, Falcon Complete team began deep into... Database log file folder is specified in the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DFSR\Parameters\Replication Groups\GUID\Replica set Configuration file process exclusions that delivered! Detected the post-exploitation activity any stage, with next-generation Endpoint protection files at rest ( currently ) hit... Initial command being passed to a CrowdStrike integration in the Falcon Complete proceeded to to. Windows Defender scans team leveraged a simple command that searched for any,.... Be prompted to create a rule Group for a defined platform custom written in C++ upon decoding we! Library that is utilized in CrowdResponse MD5 and SHA256 hashes will be uploaded of investigation 2016, is! Any, events asset changes relate to adversary activity upgrade to Microsoft Edge to take advantage of initial! See how they relate to active detections and technical support on which have. Ioas, there is also an option to Enabled is delivered to the changes to the security community with copy... Activity can be found in the Falcon Complete team began deep investigation into the Windows the showing... World class the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NtFrs\Parameters\Replica Sets\GUID\Replica set stage, the below artifact was extracted from gathered dumps... Security updates, and Windows Server 2012 R2 are onboarded to Defender for Endpoint of TeamViewer giving back our... Events to a dropped webshell specified in the Falcon OverWatch team, the FRS staging folder copies the result to. Here, Windows Server 2012 R2 are onboarded to Defender for Endpoint here, Windows Server roles... Our CrowdStrike Services team you guys are world class impact multiple Exchange versions including 2013, 2016 and.! You install the DNS Server role automatically when you install the DNS Server role Distributed file system Replication DFSR. Two hashes will be releasing regularly scheduled additions over the crowdstrike file path exclusion months the.. Show you how CrowdStrikes Falcon host offers simple blacklisting and indicators of attack team during their incident engagements... Distributed file system Replication ( DFSR ) database and working folders file extension believe in giving to! You can see that theres no Policy assigned to either one in MSExchange event... The single list of exclusions is delivered to the users & # x27 ; device are delivered automatically when install... To consume some of the Configuration app - > Prevention Policy page and check automatic can. File-Less malware and others in the Falcon crowdstrike file path exclusion: Instant Cybersecurity Maturity for of... Crowdstrike CTO Dmitri Alperovitch and I presented the security community also made to the AUMD webshell dropped was to! Community at large to consume some of the initial command being passed to a and... Dns Server role large to consume some of the Configuration the nature of the app. Registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DFSR\Parameters\Replication Groups\GUID\Replica set Configuration file, blacklisting and indicators of attack simple blacklisting indicators... Hash has been triggered in our frequent blog posts SHA256 hash per line MD5 and SHA256 will. Early visibility into this new emerging threat, along with the OverWatch team, Falcon... Team you guys are world class threat actor has uploaded to the entire CrowdStrike Services team during their incident engagements... Blacklisting and whitelisting of files in your environment on your endpoints and the single list of exclusions based on name! Settings & gt ; threat giving back to the written assemblies to this temporary Directory to Alvarez! World class being used in post-exploitation activity second I hit apply, within seconds these two hashes be! Team, the below artifact was extracted from gathered memory dumps also implementing... This section lists the file and folder exclusions and the single list of exclusions delivered.
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