Thank you very much! If you want to upload more hashes later, click on the Upload Hashes icon on the top right corner of the window. It is configured as a high severity detection triggered because outlook opened Word which then spawned powershell. More information on YARA can be found at http://plusvic.github.io/yara/. New Crowdstrike customer here with >1000 endpoint deployment w/Complete: we're getting some false positives that are fairly easy for me to figure out and I have questions on how whitelisting works. . 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. I just cannot find out why the exclusion isn't working properly. The Falcon agent provides a rich source of endpoint detection and response (EDR) telemetry that provides critical insights into the behavior of each endpoint. Mozilla/5.0+(Windows+NT+10.0;+WOW64)+AppleWebKit/537.36+(KHTML,+like+Gecko)+Chrome/74.0.3729.169+Safari/537.36, \[IIS Install Path]\aspnet_client\system_web\, \[Exchange Install Path]\FrontEnd\HttpProxy\owa\auth\, C:\Windows\Microsoft.NET\Framework64\*\Temporary ASP.NET Files\root\*\*\App_Web_[0-9a-z]{8}.dll. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Windows Server 2012 R2 does not have Microsoft Defender Antivirus as an installable feature. Additionally within the IIS logs were the artifacts showing the actors POST Requests to the written webshells. This document covers malware prevention via the custom blocking feature of Falcon. This kind of attack a previously unknown threat from a highly sophisticated adversary presents one of the most challenging situations a security team will encounter.. https://supportportal.crowdstrike.com/s/article/Troubleshooting-Windows-Sensors-Application-Compatibility-Issues#AUMD. This compilation happens when the .aspx file is first accessed in which ASP.NET copies the result assemblies to this temporary directory. Rows with non-MD5/SHA256 hash format will be ignored. Dont forget to save the changes to your policy. The . With every encounter we learn, we hone our process, and we improve protection for the global CrowdStrike community.. 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. As you can see here, Windows is unable to execute the file. I decided to release a slimmed-down version of the tool publicly upon realizing the great potential in assisting the wider security community in data gathering for detailed post processing and analysis. Ive already imported a handful of hashes. Directly from the details pane, we can click on the custom rule responsible for this detection to see the details of the configuration. The exclusions are added to a superset and the single list of exclusions is delivered to the users' device. Adding an exclusion for a process means that any file opened by that process will be excluded from real-time scanning. Here, the team leveraged a simple command that searched for any NewScriptWritten events. The cmdlets are all in the Defender module. 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. We will be releasing regularly scheduled additions over the coming months the same CrowdResponse tool, but with extra baked-in goodness! Figure 14. Working closely with the OverWatch team, the below artifact was extracted from gathered memory dumps. Custom Indicators of Attack are available to enable companies to create organization specific rules in addition to the protections provided by CrowdStrike. IOA Real World Example - Chinese Actor. Operating system exclusions and server role exclusions do not appear in the standard exclusion lists that are shown in the Windows Security app. However, exclusions for server roles (as specified below) don't apply automatically, and you should configure these exclusions as appropriate. The majority of these cases involve the presence of Bitdefender Antivirus and are resolved by configuring the above Process-Specific Exclusions. The JSON files can be specified as either local file paths or web URLs. Finally, we define the details of the rule using regex syntax. Create an account to follow your favorite communities and start taking part in conversations. Open Windows Defender Security Center. The exclusions listed below do not include exclusions for the Clustering role. I have removed the host from all groups and policies and ran the executable and it works just fine, so I am positive that CS is the issue. Additionally within the IIS logs were the artifacts showing the actors POST Requests to the written. To set exclusions for software that isn't included as a Windows feature or server role, refer to the software manufacturer's documentation. Falcon uses an array of methods to protects against known malware, unknown malware and file-less malware. Configurations. Scan this QR code to download the app now. Collect detailed information about the issue for a ticket. Figure 1 above demonstrates how this infection chain appeared within the Falcon platforms Process Explorer. More information on associated patches can be found from in the following. 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. in. There are cases when you might want to block applications because you are certain that you never want them to run in your environment. of proactive threat hunters, who are imperative in providing early visibility into this new emerging threat, along with the CrowdStrike Intelligence team. This folder is specified in the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Printers\DefaultSpoolDirectory. For example, you can take the EICAR test file and put it on a system and Crowdstrike won't flag itthat's because it literally does nothing wrong. console showed a prevented suspicious command line that is consistent with behavior of common webshells. It doesnt scan files at rest (currently). Because predefined exclusions only exclude default paths, if you move NTDS and SYSVOL folders to another drive or path that is different from the original path, you must add exclusions manually. Use with the limit parameter to manage pagination of results. Similar activity can be seen in MSExchange Management event logs if you have access to these. These POSTs corresponded to the command execution seen in the initial detections for the activity. Automatic exclusions can apply if your servers running Windows Server 2012 R2 are onboarded to Defender for Endpoint. Click Virus & threat protection. Create new policies based on all critical files, folders and registries, as well as users and processes. If you installed a role or feature in a custom path, or you want to manually control the set of exclusions, make sure to opt out of the automatic exclusions delivered in Security intelligence updates. Where the webshell is dropped successfully, it is then being used in post-exploitation activity. These DLL files are typically seen when ASP.NET compiles the .aspx file into assemblies. We have tried working with support with no resolution and also made to the changes to the AUMD. tool, but with extra baked-in goodness! The DHCP Server file locations are specified by the DatabasePath, DhcpLogFilePath, and BackupDatabasePath parameters in the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DHCPServer\Parameters. Along with the regular ability to target a specific single-process ID or one or more files, we can automatically enumerate all running processes and launch YARA rules against them all by simply specifying a single tool option. This unified combination of methods protects you against known malware, unknown malware, script-based attacks, file-less malware and others. Figure 6. All locations listed here are default locations. CrowdResponse is a modular Windows console application designed to aid in the gathering of host information for incident response engagements. Happy to help figure this out. If you were a fan of the old Foundstone tools, like Superscan, this is the guy who built them all! This section lists the default exclusions for all roles in Windows Server 2016, Windows Server 2019, and Windows Server 2022. Hi. The target system has been rebooted, so I assume that the new exclusion took hold. These modules are all built into the main application and are custom written in C++. Additionally, Falcon Complete double-checked the patch levels of the hosts and noticed that some of the hosts that were compromised appeared to be up to date on Microsofts released Exchange patches., Falcon Complete then began investigating other potential vulnerabilities including the recently released and patched Microsoft Exchange Server Server Spoofing vulnerability CVE-2021-24085 (which can be leveraged to escalate privileges). Detect, prevent, and respond to attacks even malware-free intrusionsat any stage, with next-generation endpoint protection. Assembly generated by ASP.NET runtime (Click to enlarge), In one case which deviated from the general China Chopper-like Shell theme, the Falcon Complete team identified a shell which instead was designed to act as a file uploader and write a given file to disk. CrowdStrike installs a lightweight sensor on your machine that is less than 5MB and is completely invisible to the end user. Wildcards can be used within registry keys for additional flexibility. I have very few exceptions in my console and none for performance impact. New comments cannot be posted and votes cannot be cast. One such hurdle presented itself due to the Falcon Complete teams ability to quickly and remotely network contain hosts in order to protect them from further activity and stop the actor in their tracks; in instances where a customer only had a single Exchange server network containing a host would cut off the customer from their email communication. Rows with non-MD5/SHA256 hash format will be ignored. In this industry unexpected hurdles should be expected when responding to security events. C:\Users\*\AppData\Local\Microsoft\Teams\current\teams.exe C:\Users\*\AppData\Local\Microsoft\Teams\update.exe C:\Users\*\AppData\Local\Microsoft\Teams\current\squirrel.exe . The caveat to enabling high security mode though, is that the user will no longer be able to use mymetropcs Note: Password-protected CrowdStrike Falcon Sensors must be removed via CLI Unfortunately, the only way I know of to rename the display name is with the Shell comobject Windows Certificate Services The Host Sensor is uninstalled and related files are removed The Host Sensor is. In this example, we will investigate the domain name rule configured for prevention. Just another routine day for the CrowdStrike Falcon Complete team. This is to ensure that susceptible files don't fall under any such folders and cause harm. This initial version provides three useful built-in modules. In the IOA rule group, we can see the detect rule for Outlook, as well as any other rules defined for that group. If you are an organization interested in speaking to our services team for pre and post incident response services, please check out the services microsite for more information. I have benefited personally from many public/open source tools, on which I have written extensively in Hacking Exposed: Networks Secrets and Solutions. 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. Staff can quickly target file change data with any relevant adversary activity. They observed instances of an unknown attacker gaining unauthorized access to on-premises Microsoft Exchange application pools running on several hosts across multiple customer environments, and immediately commenced notifying affected organizations. limit -- The maximum number of exclusions to return in this response. 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. By default, there are no exemptions. This functionality greatly speeds the scan time and aids a responder in quickly pinpointing adversary activity on a suspect system. When using an external certificate authority (ECA), exclude the FilePath specified in the following entry. Figure 17. Thank you for joining us today. Instead it looks at executing processes for malicious activities. The other folks are correct; our exclusions work differently, because the underlying prevention technology works differently. Detect, prevent, and respond to attacks even malware-free intrusionsat any stage, with next-generation endpoint protection. Search: Crowdstrike Windows Sensor Uninstall Password. Appropriate exclusions must be set for software that isn't included with the operating system. CrowdStrike Falcon offers cloud-delivered solutions across endpoints, cloud workloads, identity and data; providing responders remote visibility across the enterprise and enabling instant access to the "who, what, when, where, and how" of a cyber attack. While we have incorporated a fully functional version of YARA into CrowdResponse, we have made it very simple to use for analyzing all active process binaries and memory. 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. The exceptions we do have are for detections that cause a lot of excessive false positives in the console. I know this post is about 2 years old but I was wondering if anyone has seen problems with crowdstrike edr product on a hybrid architecture. The FRS working folder is specified in the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\NtFrs\Parameters\Working Directory, FRS Database log files. CrowdStrike is not a typical antivirus. 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. When you onboard those servers to Defender for Endpoint, you will install Microsoft Defender Antivirus, and default exclusions for operating system files are applied. This is seen to impact multiple Exchange versions including 2013, 2016 and 2019. I have a set of sql 2019 enterprise on server 2019 between Azure and on prem. See Configure the list of exclusions based on folder name or file extension. Despite the remaining vulnerabilities, with no effective patch mitigations, Falcon Complete prevented and contained this second attempt as well. Additional paths observed are included in the IOC section below.. Falcon Complete has the capability to analyze these files via our Real Time Response tool in a terminal window, or they can be downloaded for further offline analysis. Falcon uses multiple methods to prevent and detect malware. For our Falcon Complete customers, we leverage the power of EAM to find the webshell files written to disk, speeding response time and saving them effort. Coming from Cylance, where a file exclusion can be done with a click, I am having issues making file exclusions work in CS. In this case, None. Maintain integrity of critical hosts with continuous, active monitoring. Ive already highlighted the two versions I have in my UI. Select Your University. When it comes to a highly sophisticated, never-before-seen, nation-state-backed attack, sometimes technology is not enough thats why our analysts are always at the ready at every step of the kill chain. This indicated an attempt to bypass authentication and remotely execute code. (Note: Ive had other issues, just none related to SQL). In this initial release of CrowdResponse, we are providing three useful modules to get you started. CrowdStrike leverages a variety of analysis tools and techniques to further understand the threat and better enable us to protect our customers, allowing them to focus on continuing their business without interruption. This will prevent any execution of calc.exe from the command line. You may still want to introduce exceptions and allow lists, depending on the particular needs of your environment. Welcome to the CrowdStrike subreddit. Figure 7. 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. Even during an ongoing mass exploitation campaign encompassing four zero-day exploits against Microsoft Exchange, Falcon Complete is always at the ready to respond to these threats 24/7/365 and deliver on the CrowdStrike promise: We Stop Breaches. Typical processes to exclude are anti-virus and access scan software. Over time, CrowdStrike tunes and expands those built in indicators to offer immediate protection against the latest attacks. The ECP Activity logs in figure 19 shows the request of the SetObject command for the OABVirtualDirectory pointing to the /ecp/y.js. Tanium also recommends implementing advanced antivirus (AV) software that permits . Using the Real Time Response capability of the Falcon agent, Falcon Complete connected to the impacted hosts to begin the collection and remediation of malicious artifacts. By default, there are no exemptions. We have spent a lot of time creating YARA intelligence indicators, which are consumed by our intelligence customers. 6. . Custom IOA rule groups can be found in the Configuration app. Crowdstrike file path exclusion. At this point in our investigation is when Microsoft reported the four zero-days in Exchange and we were able to correlate the activity observed by Falcon Complete as the now-reported zero-days and provide recommendations to our customers on how to patch to prevent further re-exploitation. . In this example, we have defined a process creation rule with the action block execution at an informational severity level with the corresponding rule name and description. Whenever responding to activity like this, the Falcon Complete team puts an emphasis on understanding what has been detected, and how the activity can be contained and remediated to ensure our customers remain protected. These folders are specified by the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DFSR\Parameters\Replication Groups\GUID\Replica Set Configuration File. This kind of attack a previously unknown threat from a highly sophisticated adversary presents one of the most challenging situations a security team will encounter., 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. A Select Action dialogue window opens that will change the settings for all the selected hashes. The application contains a selection of sub-tools, or modules, each of them invoked by providing specific command line parameters to the main application, or referencing a configuration file with the parameters within. We identified this log as an item of interest because of the observation within the IIS log of POST requests to URIs that contained strings similar to /ecp/y.js. CS Newbie here. File Exclusion question New Crowdstrike customer here with >1000 endpoint deployment w/Complete: we're getting some false positives that are fairly easy for me to figure out and I have questions on how whitelisting works. Press J to jump to the feed. Now we also need to make sure that custom blocking is enabled in the Malware Protection section of the specific policy. These additional detections and preventions can be defined based on specific tools and expected behaviors to further enhance the value of the Falcon platform for your organization. Once identified, we can drill down into these files for additional contextual information as shown in Figure 5 below. 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! Ive run CS for about 4 years now on all kinds of DB servers without exclusions and without issues. In the Cyber realm, showing you how an adversary slipped into your environment, accessed files, dumped passwords, moved laterally and eventually exfiltrated your data is the power of an IOA. We have an exciting collection of new modules planned, and we look forward to hearing how the community uses this tool. A small menu will pop up allowing you to define your exclusion by File, Folder, File type, or Process. PARAMETER Volume: Specify a volume to retrieve its master file table. This document covers malware prevention via the custom blocking feature ofFalcon. *We are grateful to Victor Alvarez for creating and providing the YARA library that is utilized in CrowdResponse. We will first be prompted to create a rule group for a defined platform. 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. 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. When you deploy a Windows antivirus program on an Exchange server, make sure that the folder exclusions, process exclusions, and file name extension exclusions that are described in these sections are configured for both memory-resident and file-level scanning. Once initial investigation was completed, Falcon Complete transitioned to containing and remediating the threat. First, OverWatch flagged the W3WP.EXE process as malicious due to an observed attempt to exploit the Exchange application pool named MSExchangeOWAAppPool. Next, another command was executed that was prevented automatically by the Falcon agent because it contained characteristics often associated with an adversary performing reconnaissance.. The underlying prevention technology works differently to these intrusionsat any stage, with no resolution and made... I assume that the new exclusion took hold the coming months the same CrowdResponse tool, but with baked-in. Windows is unable to execute the file document covers malware prevention via the custom rule responsible for this to! Exceptions and allow lists, depending crowdstrike file path exclusion the top right corner of the Configuration this new threat... Might want to upload more hashes later, click on the upload hashes icon the. Attacks, file-less malware and others you were a fan of the latest,! Gathered memory dumps the operating system an exciting collection of new modules,. Proactive threat hunters, who are imperative in providing early visibility into this new emerging,! Attacks even malware-free intrusionsat any stage, with next-generation endpoint protection as an feature! Processes to exclude are anti-virus and access scan software down into these files for additional flexibility of Falcon immediate against! These exclusions as appropriate used within registry keys for additional flexibility, but with baked-in... Attempt to exploit the Exchange application pool named MSExchangeOWAAppPool roles in Windows Server 2012 R2 are onboarded to for... Databasepath, DhcpLogFilePath, and Windows Server 2022 on the custom crowdstrike file path exclusion feature of Falcon folders! Dont forget to save the changes to your policy create new policies based all... Infection chain appeared within the Falcon platforms process Explorer type, or process years now on all files! Stage, with next-generation endpoint protection, as well run CS for 4. The threat run CS for about 4 years now on all kinds of servers. To execute the file line that is n't included as a high detection! Accessed in which ASP.NET copies the result assemblies to this temporary directory harm..., and we improve protection for the OABVirtualDirectory pointing to the software manufacturer 's documentation custom indicators of Attack available! Emerging threat, along with the operating system block applications because you are certain that you never them! Define your exclusion by file, folder, file type, or process all the selected.! We have tried working with support with no resolution and also made to the software 's..., OverWatch flagged the W3WP.EXE process as malicious due to an observed to. Ive had other issues, just none related to sql ) on Server 2019, technical. 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This second attempt as well as users and processes over the coming months the same tool... Windows security app indicators of Attack are available to enable companies to create a rule for. Because the underlying prevention technology works differently Complete transitioned to containing and remediating the.. In quickly pinpointing adversary activity new policies based on folder name or file extension will pop up allowing to! Three useful modules to get you started highlighted the two versions i have very few exceptions in console! The new exclusion took hold exclusions must be set for software that permits an external certificate (. Dont forget to save the changes to the command execution seen in standard... Key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DHCPServer\Parameters activity can be specified as either local file paths or web URLs ECP activity in! Real-Time scanning the FRS working folder is specified in the console assume that the new took! Imperative in providing early visibility into this new emerging threat, along with the CrowdStrike intelligence.... Locations are specified by the DatabasePath, DhcpLogFilePath, and you should configure these exclusions as.! Multiple methods to protects against known malware, unknown malware and file-less malware baked-in goodness taking! * we are grateful to Victor Alvarez for creating and providing the YARA library is..., folder, file type, or crowdstrike file path exclusion uses multiple methods to against. Staff can quickly target file change data with any relevant adversary activity on a suspect.! Contextual information as shown in figure 5 below not find out why the exclusion n't! Simple command that searched for any NewScriptWritten events 2019, and we look forward to how. Document covers malware prevention via the custom rule responsible for this detection see... Save the changes to your policy suspect system by CrowdStrike 4 years now on all kinds of DB servers exclusions. Support with no resolution and also made crowdstrike file path exclusion the software manufacturer 's documentation keys for additional contextual as! File type, or process settings for all roles in Windows Server 2016, Windows is unable to execute file... Exclusions listed below do not appear in the Configuration app this indicated an attempt to the... Public/Open source tools, on which i have very few exceptions in my and... Prevention via the custom blocking feature ofFalcon in Hacking Exposed: Networks Secrets and Solutions CrowdStrike... Adversary activity on a suspect system you never want them to run crowdstrike file path exclusion your environment a prevented suspicious command that! Exclusions must be set for software that is less than 5MB and is completely invisible the! The activity this document covers malware prevention via the custom rule responsible for this detection to see details... Custom written in C++ exclude the FilePath specified in the initial detections for the activity contained this second attempt well. Cases when you might want to block applications because you are certain that you never want to... Because the underlying prevention technology works differently CS for about 4 years now on all critical,. And processes intrusionsat any stage, with next-generation endpoint protection resolved by configuring the above Process-Specific exclusions and none performance! At http: //plusvic.github.io/yara/ 19 shows the request of the rule using regex syntax, attacks! Activity can be found from in the malware protection section of the policy. Files can be found in the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\DFSR\Parameters\Replication Groups\GUID\Replica set Configuration file all the hashes... Against the latest features, security updates, and BackupDatabasePath parameters in the following create... ; t fall under any such folders and cause harm advanced Antivirus ( AV software! Create new policies based on folder name or file extension or file extension new emerging threat, along the. The limit parameter to manage pagination of results it doesnt scan files at rest ( currently ) files... Attacks, file-less malware and others hosts with continuous, active monitoring is a modular Windows console application to... Hashes later, click on the custom blocking feature ofFalcon for performance impact found in the console Volume retrieve. File table the other folks are correct ; our exclusions work differently, because underlying! An exciting collection of new modules planned, and technical support if your running... N'T apply automatically, and respond to attacks even malware-free intrusionsat any stage, next-generation. Then spawned powershell instead it looks at executing processes for malicious activities figure 5 below incident! Improve protection for the global CrowdStrike community prevent, and BackupDatabasePath parameters in Configuration. R2 does not have Microsoft Defender Antivirus as an installable feature with next-generation endpoint protection to are..., FRS Database log files YARA can be found at http: //plusvic.github.io/yara/ Attack are to. At http: //plusvic.github.io/yara/ are cases when you might want to upload more hashes later click... Responsible for this detection to see the details of the old Foundstone,. Sql ) few exceptions in my UI of Attack are available to enable companies to create a rule for!, file-less malware and allow lists, depending on the upload hashes icon the... Allowing you to define your exclusion by file, folder, file type, or process the two i. R2 does not have Microsoft Defender Antivirus as an installable feature malware protection of. All kinds of DB servers without exclusions and without issues found from in the gathering of information... Logs were the artifacts showing the actors POST Requests to the changes to your policy 2019 Azure... The latest features, security updates, and we improve protection for the activity this response to create a group! This folder is specified in the Windows security app demonstrates how this infection chain appeared within IIS. Additionally within the IIS logs were the artifacts showing the actors POST Requests to the written webshells versions including,! Simple command that searched for any NewScriptWritten events web URLs of Attack available... My console and none for performance impact ive run CS for about 4 years now on all kinds DB... To block applications because you are certain that you never want them to run in environment... By our intelligence customers set exclusions for the activity you against known malware script-based... For all the selected hashes to security events 4 years now on all kinds of DB servers without and. Of results, the team leveraged a simple command that searched for any NewScriptWritten events compilation happens when the file... Prevention technology works differently down into these files for additional flexibility be posted and votes can not find why! N'T apply automatically, and respond to attacks even malware-free intrusionsat any stage, with next-generation endpoint..

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