attack surface reduction audit log

The answer depends on your goal. Remote Code Execution rule for Default Rule Set (DRS) versions 1.0/1.1, Figure 25. During our sustained monitoring of threats taking advantage of the Log4j 2 vulnerabilities, we observed activity related to attacks being propagated via a previously undisclosed vulnerability in the SolarWinds Serv-U software. As of January 20, 2022, threat and vulnerability management can discover vulnerable Log4j libraries, including Log4j files and other files containing Log4j, packaged into Uber-JAR files. Block: Enable the ASR rule3. This help us in whitelisting the ASR rules, Posted in There are variations in some ASR rules mode listings; Blocked and Enabled provide the same functionality. Notifications and any alerts that are generated can be viewed in the . Many of these campaigns are running concurrent scanning and exploitation activities for both Windows and Linux systems, using Base64 commands included in the JDNI:ldap:// request to launch bash commands on Linux and PowerShell on Windows. Follow myMicrosoftSecurity Blogs:http://aka.ms/JohnBarbareandalsoonLinkedIn. These events warrant further investigation to determine if they are in fact related to a vulnerable Log4j application. Attack surface reduction rules can constrain software-based risky behaviors and help keep your organization safe. Microsoft Endpoint Manager: Create & Audit an ASR Policy, Prevent actions and apps that are commonly used by malware, such as launching executables from email (.exe, .dll, .scr, .ps, .vbs, and .js), Scripts or applications that launch child processes, Most rules can be set to Audit to monitor activity prior to being set to enforce, Most rules support exclusions based on file or folder names, ASR rules support environmental variables and wildcards. Set a description, so that everyone with access to the portal knows the purpose. When you create or update a profile, you can add scope tags and applicability rules to the profile. An attack surface is defined as the entire network landscape of an organization that is susceptible to hacking. Do this for each of the custom views you want to use. A tag already exists with the provided branch name. Microsoft can confirm public reports of the Khonsari ransomware family being delivered as payload post-exploitation, as discussed by Bitdefender. Leverage this method of exploration to aid in understanding the larger Internet exposure, while also filtering down to what may impact you. Finding vulnerable applications and devices via software inventory. After scrolling down one can see the rest of the configuration settings to make sure everything is correct before deploying out the new ASR rule policy. These capabilities are supported on Windows 10, Windows 11, and Windows Server 2008, 2012, and 2016. Attack Surface Reduction Rules - Warn Mode with MEM/M365 Defender Why attack surface reduction rules are important, Advanced hunting and attack surface reduction events, Attack surface reduction features across Windows versions, Review attack surface reduction events in the Microsoft 365 Defender portal, Review attack surface reduction events in Windows Event Viewer, Attack surface reduction (ASR) rules deployment overview, Plan attack surface reduction (ASR) rules deployment, Test attack surface reduction (ASR) rules, Enable attack surface reduction (ASR) rules, Operationalize attack surface reduction (ASR) rules, Microsoft Defender Vulnerability Management, Microsoft Defender Antivirus and antimalware updates, Update for Microsoft Defender antimalware platform, Block JavaScript or VBScript from launching downloaded executable content, Block persistence through WMI event subscription, Use advanced protection against ransomware, Proactively hunt for threats with advanced hunting, Attack surface reduction (ASR) rules report, Exclusions for Microsoft Defender for Endpoint and Microsoft Defender Antivirus, Set preferences for Microsoft Defender for Endpoint on macOS, macOS Antivirus policy settings for Microsoft Defender Antivirus for Intune, Set preferences for Microsoft Defender for Endpoint on Linux, Configure Defender for Endpoint on Android features, Configure Microsoft Defender for Endpoint on iOS features, Launching executable files and scripts that attempt to download or run files, Running obfuscated or otherwise suspicious scripts, Performing behaviors that apps don't usually initiate during normal day-to-day work, The monitoring, analytics, and workflows available in, The reporting and configuration capabilities in. Suppose that the first event occurred at 2:15, and the last at 2:45. Hope to see you inmynextblogand always protect your endpoints! Windows Server 2016 and Windows Server 2012 R2 will need to be onboarded using the instructions in Onboard Windows servers for this feature to work. [01/19/2022] New information about an unrelated vulnerability we discovered while investigating Log4j attacks, [01/11/2022] New threat and vulnerability management capabilities to apply mitigation directly from the portal, as well as new advanced hunting queries, [01/10/2022] Added new information about a China-based ransomware operator targeting internet-facing systems and deploying the NightSky ransomware, [01/07/2022] Added a new rule group in Azure Web Application Firewall (WAF). :::image type="content" source="images/asr-defender365-filter.png" alt-text="The Attack surface reduction rules detections filter on rules" lightbox="images/asr-defender365-filter.png"::: [!NOTE] We will continue to follow up on any additional developments and will update our detection capabilities if any additional vulnerabilities are reported. The next tab, Configuration settings is where you will configure the ASR rules. To . Figure 19. Under List of additional folders that need to be protected, List of apps that have access to protected folders, and Exclude files and paths from attack surface reduction rules, enter individual Refer to the Microsoft Security Response Center blog for technical information about the vulnerabilities and mitigation recommendations. Depending on how you want to view your data, it will display in each chart type as seen below. It surfaces exploitation but may surface legitimate behavior in some environments. Recommendation: Audit Mode for users with Office integrations. Attack Surface Reduction Dashboard for Microsoft Sentinel Daniel Chronlund Cloud, Microsoft, Microsoft Sentinel, Security June 15, 2022 2 Minutes Before we start, my Microsoft Sentinel contributions have a new home on GitHub! Limited management options. :::image type="content" source="images/attack-surface-reduction-rules-report-main-tabs-search-configuration-tab.png" alt-text="Screenshot that shows the ASR rules report search feature on the configuration tab." Open the Container Registry images should have vulnerability findings resolved recommendation and search findings for the relevant CVEs. However, if you do have those licenses, you can use Event Viewer and Microsoft Defender Antivirus logs to review your attack surface reduction rule events. Recommendations for deploying the latest Attack surface reduction rules All attack surface reduction events are located under Applications and Services Logs - Microsoft - Windows and then the folder or provider as listed in the following table. Learn how to centrally discover and deploy Microsoft Sentinel out-of-the-box content and solutions. Microsoft Defender for Endpoint (MDE) Attack surface reduction (ASR) rules deployment, Attack surface reduction guide, ASR deployment, test asr rules, ASR rules exclusions, Microsoft ASR, configure ASR rules, attack surface reduction rules best practice, attack surface reduction intune, ASR rules event viewer, attack surface reduction defender, asr rules powershell, attack surface reduction best practice, disable ASR rules, host intrusion prevention system, protection rules, anti-exploit rules, anti-exploit, exploit rules, infection prevention rules, Microsoft Defender for Endpoint, configure ASR rules, Cannot retrieve contributors at this time. Figure 7. We strongly recommend affected customers to apply security updates released by referring to the SolarWinds advisory here: https://www.solarwinds.com/trust-center/security-advisories/cve-2021-35247. While services such as interact.sh, canarytokens.org, burpsuite, and dnslog.cn may be used by IT organizations to profile their own threat footprints, Microsoft encourages including these services in your hunting queries and validating observations of these in environments to ensure they are intentional and legitimate activity. Images are automatically scanned for vulnerabilities in three different use cases: when pushed to an Azure container registry, when pulled from an Azure container registry, and when container images are running on a Kubernetes cluster. Provides steps to use audit mode to test attack surface reduction rules. These include service[.]trendmrcio[. Attack surface reduction, or ASR, is an umbrella term for all the built-in and cloud-based security features Windows 10 offers that help to minimize the surface of attack, or areas of entry, for an attacker. ]ga, apicon[.]nvidialab[. You can use Export to save the full list of detections to Excel. license, this link will open the Microsoft Defender 365 Reports > Attack surface reductions > Exclusions tab. Each entry must be listed as a name value pair, where the name should be a string representation of a path or a fully qualified resource name. Configure attack surface reduction in Microsoft Defender - 4sysops The string contains jndi, which refers to the Java Naming and Directory Interface. [!div class="mx-imgBorder"] Microsoft Sentinel customers can use the following detection queries to look for this activity: This hunting query looks for possible attempts to exploit a remote code execution vulnerability in the Log4j component of Apache. [!NOTE] January 21, 2022 update Threat and vulnerability management can now discover vulnerable Log4j libraries, including Log4j files and other files containing Log4j, packaged into Uber-JAR files. Finding running images with the CVE-2021-45046 vulnerability. Step 2: Understand the ASR rules reporting page in the Microsoft 365 Defender portal, Use PowerShell as an alternative method to enable ASR rules, Use Windows Event Viewer Review as an alternative to the attack surface reduction rules reporting page in the Microsoft 365 Defender portal, Additional topics in this deployment collection, Use role-based access control (RBAC) and scope tags for distributed IT in Intune, Assign device profiles in Microsoft Intune, Configure and validate exclusions based on extension, name, or location, GUID value of the attack surface reduction rule, Event when an attack surface reduction rule fires in block mode, Event when an attack surface reduction rule fires in audit mode, use Microsoft Defender for Endpoint ASR rules reports, If it is not already configured, set the rule for which you want to configure exclusions to *. Also, when certain attack surface reduction rules are triggered, alerts are generated. Microsoft Defender for Endpoint integrates with this feature and adds more management and visibility when ASR is used at scale. Testing Microsoft Defender for Endpoint (MDE) attack surface reduction (ASR) rules helps you determine if rules will impede line-of-business operations prior to enabling any rule. This policy setting allows you to prevent ASR rules from matching on files under the paths specified or for the fully qualified resources specified. Working with automatic updates reduces operational effort and ensures greater security. Observed post exploitation activity such as coin mining, lateral movement, and Cobalt Strike are detected with behavior-based detections. We have observed many existing attackers adding exploits of these vulnerabilities in their existing malware kits and tactics, from coin miners to hands-on-keyboard attacks. Microsoft advises customers to investigate with caution, as these alerts dont necessarily indicate successful exploitation: The following alerts detect activities that have been observed in attacks that utilize at least one of the Log4j vulnerabilities. As of December 27, 2021, discovery is based on installed application CPEs that are known to be vulnerable to Log4j RCE, as well as the presence of vulnerable Log4j Java Archive (JAR) files. 5007 -> Event when settings are changed. Its recommended to test in Audit mode before you decide and enable any of the ASR rules in enforce mode. Use user groups when you want your settings and rules to always go with the user, whatever device they use. This will bring you to the creation of the profile for ASR. With Inventory tools, there are two ways to determine exposure across hybrid and multi-cloud resources: Figure 9. Attack surface reduction rules target certain software behaviors, such as: Such software behaviors are sometimes seen in legitimate applications. For more information about threat intelligence packages in Defender for IoT, please refer to the documentation. Based on the nature of the vulnerabilities, once the attacker has full access and control of an application, they can perform a myriad of objectives. As the filter currently functions in this release, every time you want to "group by", you must first scroll down to last detection in the list to load the complete data set. On the left panel, under Actions, select Create Custom View Go to the XML tab and select Edit query manually. Audit ASR rules, configure ASR rules exclusions. It will create a custom view that filters to only show the events related to that feature. For specific details about notification and alert functionality, see: Per rule alert and notification details, in the article Attack surface reduction rules reference. license, this link will open the Microsoft Defender 365 Reports > Attack surface reductions > Configurations tab. These access brokers then sell access to these networks to ransomware-as-a-service affiliates. For example, an attacker might try to run an unsigned script off a USB drive, or have a macro in an Office document make calls directly to the Win32 API. ASR rules exclusions. In response to this threat, Azure Web Application Firewall (WAF) has updated Default Rule Set (DRS) versions 1.0/1.1 available for Azure Front Door global deployments, and OWASP ModSecurity Core Rule Set (CRS) version 3.0/3.1 available for Azure Application Gateway V2 regional deployments. Attack Surface Reduction: why is important and how to configure in I want to know whether there is any Kusto query to run in Advanced Hunting and get the list of files in audit mode. Navigate to where you extracted the XML file for the custom view you want and select it. If you have a Microsoft Defender 365 E5 (or Windows E5?) :::image type="content" source="images/attack-surface-reduction-rules-report-main-detections-card.png" alt-text="Graph that shows the ASR rules report summary detections card." Presents overview information and prerequisites for deploying attack surface reduction rules, followed by step-by-step guidance for testing (audit mode), enabling (block mode) and monitoring. Not configured: Disable the ASR rule2. Attack surface reduction (ASR) rules deployment overview, Plan attack surface reduction (ASR) rules deployment, Enable attack surface reduction (ASR) rules, Operationalize attack surface reduction (ASR) rules, Attack surface reduction (ASR) rules reference. In the next window you will select any scope tags you have assigned for any of your devices and click next. On the far right, you can change the time from last 24 hours, last 7 days, last 30 days, or a custom time range of your choosing. Click on Next and configure the custom Configuration profile. To enable an attack surface reduction rule in audit mode, use the following PowerShell cmdlet: . When a user unblocks content, the content remains unblocked for 24 hours, and then blocking resumes. Use the following resources to learn more: More info about Internet Explorer and Microsoft Edge, Enable hardware-based isolation for Microsoft Edge, Windows Defender Application Control design guide, Deploying Windows Defender Application Control (WDAC) policies, Windows Defender Firewall with advanced security, Windows Defender Firewall deployment guide, investigate issues as part of the alert timeline and investigation scenarios, Step 2: Understand the Attack surface reduction rules reporting page, Attack surface reduction (ASR) rules deployment overview, Plan attack surface reduction (ASR) rules deployment, Test attack surface reduction (ASR) rules, Enable attack surface reduction (ASR) rules, Operationalize attack surface reduction (ASR) rules, Attack surface reduction (ASR) rules reference, Attack surface reduction (ASR) rules deployment guide, Security-Mitigations (Kernel Mode/User Mode), Event when Network protection fires in Audit-mode, Event when Network protection fires in Block-mode, Blocked Controlled folder access sector write block event, Audited Controlled folder access sector write block event. Web protection lets you secure your devices against web threats and helps you regulate unwanted content. The Webtoos malware has DDoS capabilities and persistence mechanisms that could allow an attacker to perform additional activities. To find the audited entries, go to Applications and Services > Microsoft > Windows > Windows Defender > Operational. Devices with Log4j vulnerability alerts and additional other alert-related context. Microsoft Defender Antivirus detects components and behaviors related to this threat as the following detection names: Users of Microsoft Defender for Endpoint can turn on the following attack surface reduction rule to block or audit some observed activity associated with this threat. While its uncommon for Minecraft to be installed in enterprise networks, we have also observed PowerShell-based reverse shells being dropped to Minecraft client systems via the same malicious message technique, giving an actor full access to a compromised system, which they then use to run Mimikatz to steal credentials. As we take a look at the ASR rule Audit report, we can see the Action Type is the ASR rule that was audited and then the file name, folder path, and other columns in the report. If you have a Microsoft Defender 365 E5 (or Windows E5?) January 19, 2022 update We added new information about an unrelated vulnerability we discovered while investigating Log4j attacks. With audit mode, you can review the event log to see what affect the feature would have had if it was enabled. Microsoft will continue to monitor this dynamic situation and will update this blog as new threat intelligence and detections/mitigations become available. Use Defender for Endpoint to get greater details for each event. Finding vulnerable software via advanced hunting. This section lists all the events, their associated feature or setting, and describes how to create custom views to filter to specific events. Microsoft has not observed any follow-on activity from this campaign at this time, indicating that the attacker may be gathering access for later use. IntroductionThis is John Barbare and I am a Sr Premier Field Engineer at Microsoft focusing on all things in the Cybersecurity space. This query surfaces devices with Log4j-related alerts and adds additional context from other alerts on the device. We have observed these groups attempting exploitation on both Linux and Windows systems, which may lead to an increase in human-operated ransomware impact on both of these operating system platforms. This query identifies unique, uncommon PowerShell flags used by curl to post the results of an attacker-executed command back to the command-and-control infrastructure. You can also use Group Policy, Intune, or mobile device management (MDM) configuration service providers (CSPs) to configure and deploy the setting. Threat and vulnerability management automatically and seamlessly identifies devices affected by the Log4j vulnerabilities and the associated risk in the environment and significantly reduces time-to-mitigate. Once logged in you will arrive at the home page. You can set ASR rules for devices running any of the following editions and versions of Windows: ASR rules contain over a dozen configurable rules that can enable or disable specific behaviors. Find out more about the Microsoft MVP Award Program. In this case, it applied my new ASR rule policy to all devices I targeted successfully. A regularly updated list of vulnerable products can be viewed in the Microsoft 365 Defender portal with matching recommendations. This can help prioritize mitigation and/or patching of devices based on their mitigation status. In this tutorial I will walk you through the steps of creating an Attack Surface Reduction (ASR) rule policy in Microsoft Endpoint Manager (MEM) for your Windows Operating Systems and how to view the detections once applied. Protect and maintain the integrity of a system as it starts and while it's running. We assess that PHOSPHORUS has operationalized these modifications. Searching vulnerability assessment findings by CVE identifier, Figure 10. The specially crafted string that enables exploitation of the vulnerabilities can be identified through several components. We also added the following new alert, which detects attempts to exploit CVE-2021-44228 through email headers: Figure 16. Due to the many software and services that are impacted and given the pace of updates, this is expected to have a long tail for remediation, requiring ongoing, sustainable vigilance. Sample alert on malicious sender display name found in email correspondence. Specifically, it: Figure 1. If possible, it then decodes the malicious command for further analysis. In these attacks, HAFNIUM-associated systems were observed using a DNS service typically associated with testing activity to fingerprint systems. By monitoring audit data and adding exclusions for necessary applications, you can deploy attack surface reduction rules without reducing productivity. MSTIC has also observed the CVE-2021-44228 vulnerability being used by multiple tracked nation-state activity groups originating from China, Iran, North Korea, and Turkey. Warn mode helps your organization have attack surface reduction rules in place without preventing users from accessing the content they need to perform their tasks. You signed in with another tab or window. Use the additional data field across all returned results to obtain details on vulnerable resources: Microsoft Sentinel customers can use the following detection query to look for devices that have applications with the vulnerability: This query uses the Microsoft Defender for Cloud nested recommendations data to find machines vulnerable to Log4j CVE-2021-44228.
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