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. Specify a name for your filter. ASR features. The specially crafted string that enables exploitation of the vulnerabilities can be identified through several components. This tab provides a method to select detected entities (for example, false positives) for exclusion. Guidance for preventing, detecting, and hunting for exploitation of the 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. Selecting the line chart, one can see each ASR rule Audit detections over a period of time. [12/15/2021] Details about ransomware attacks on non-Microsoft hosted Minecraft servers, as well as updates to product guidance, including threat and vulnerability management. Find out more about the Microsoft MVP Award Program. Refer to the Microsoft Security Response Center blog for technical information about the vulnerabilities and mitigation recommendations. To configure attack surface reduction in your environment, follow these steps: Enable hardware-based isolation for Microsoft Edge. 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. Provides guidance to test your attack surface reduction (ASR) rules deployment. Nothing more, nothing less. The mitigation will be applied directly via the Microsoft Defender for Endpoint client. 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. Recommended ASR rules Download and Import Endpoint logging investigation at the Endpoint Endpoint logging investigation at the Security Portal Exclusions Attack Surface Reduction rules have huge impact on endpoint security in a positive way. Customers can clickNeed help? See Configure and validate exclusions based on extension, name, or location. You can enable the following ASR security features in audit mode: Audit mode lets you see a record of what would have happened if you had enabled the feature. As early as January 4, attackers started exploiting the CVE-2021-44228 vulnerability in internet-facing systems running VMware Horizon. Exam MS-101 topic 2 question 85 discussion - ExamTopics We reported our discovery to SolarWinds, and wed like to thank their teams for immediately investigating and working to remediate the vulnerability. Always place each rule in Audit first to monitor for testing of the policy before moving any of the rules into Enable (Block) mode. In the Assignments pane, you can deploy or "assign" the profile to your user or device groups. Click on the view detections tab to see a more fine-grained ASR rule detection graph in Audit and Block mode over a period time and what has been detected. Recommendation: Customers are recommended to enable WAF policy with Default Rule Set 1.0/1.1 on their Front Door deployments, or with OWASP ModSecurity Core Rule Set (CRS) versions 3.0/3.1 on Application Gateway V2 to immediately enable protection from this threat, if not already enabled. MSTIC and the Microsoft 365 Defender team have confirmed that multiple tracked activity groups acting as access brokers have begun using the vulnerability to gain initial access to target networks. You can enable audit mode using Group Policy, PowerShell, and configuration service providers (CSPs). The dialog box also offers the user an option to unblock the content. To summarize, use device groups when you don't care who's signed in on the device, or if anyone is signed in. Example detection leveraging network inspection provides details about the Java class returned following successful exploitation. Attack surfaces are generally all points of access where an intruder can probe the system and can perform malicious activities, in such a way to destroy or steal the organizations critical data. However, these behaviors are often considered risky because they're commonly abused by attackers through malware. Sharing best practices for building any app with .NET. Below is a chart displaying each ASR rule in the respective categories. You can: The following image illustrates how the Advanced Hunting query page opens from the link on the actionable flyout: For more information about Advanced hunting, see Proactively hunt for threats with advanced hunting in Microsoft 365 Defender. Click on Next and configure the custom Configuration profile. Clicking on the Chart type, you can view all the data in a table, column chart, stacked column chart, pie chart, donut chart, line chart, scatter chart, and area chart. Configure Attack Surface Reduction ASR Rules in Intune We are listing them here, as it is highly recommended that they are triaged and remediated immediately given their severity and the potential that they could be related to Log4j exploitation: Some of the alerts mentioned above utilize the enhanced network inspection capabilities in Microsoft Defender for Endpoint. Demystifying attack surface reduction rules - Part 1 Figure 22. Microsoft is a leader in cybersecurity, and we embrace our responsibility to make the world a safer place. license, this link will open the Microsoft Defender 365 Reports > Attack surface reductions > Exclusions tab. You can: More info about Internet Explorer and Microsoft Edge, New functionality in the modern unified solution for Windows Server 2012 R2 and 2016, Create and manage roles for role-based access control, Attack surface reduction rules Detections tab, Attack surface reduction rules Configuration tab, Block credential stealing from the Windows local security authority subsystem (lsass.exe), Block abuse of exploited vulnerable signed drivers, Block persistence through Windows Management Instrumentation (WMI) event subscription, Proactively hunt for threats with advanced hunting in Microsoft 365 Defender, 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 report, The file determined to contain a possible or known threat, Whether the detecting rule for the specific event was in Block or Audit mode, The application that made the call to the offending "detected file", The name of the device on which the Audit or Block event occurred, The Active Directory group to which the device belongs, The machine account responsible for the call, The company that released the particular .exe or application, devices that aren't configured to use the standard protection rules to block threats, Drill down to gather detailed information, All exposed Devices (devices with missing prerequisites, rules in Audit mode, misconfigured rules, or rules not configured), Overall configuration (Whether any rules are on or all are off), Rules in block mode (the number of rules per-device set to block), Rules in audit mode (the number of rules in audit mode), Rules turned off (rules that are turned off or aren't enabled), In the flyout window, verify your selections and then select. :::image type="content" source="images/attack-surface-reduction-rules-report-per-rule-exclusion.png" alt-text="Screenshot that shows the configuration settings for adding ASR per-rule exclusions." The bulk of attacks that Microsoft has observed at this time have been related to mass scanning by attackers attempting to thumbprint vulnerable systems, as well as scanning by security companies and researchers. Note, you must be registered with a corporate email and the automated attack surface will be limited. 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. Click on Create. Microsoft Defender for Endpoint (MDE) ASR test includes, audit defender ASR rules, configure ASR rules using Intune, Microsoft ASR rules reporting, ASR rules exclusions, ASR rules event viewer. These events warrant further investigation to determine if they are in fact related to a vulnerable Log4j application. Microsoft recommends customers to do additional review of devices where vulnerable installations are discovered. Access to this report granted by Azure AD roles, such as Security Global Admin or Security role, is being deprecated and will be removed in April 2023. Viewing the newly applied ASR Policy to the targeted machines, Monitoring the ASR Rules in Audit Mode in Microsoft Defender ATP. Regex to identify malicious exploit string. When exclusions are added, the report provides a summary of the expected impact. Microsoft recommends enabling all ASR rules, but every case and customer is different. Attack surface reduction rules, asr, hips, host intrusion prevention system, protection rules, anti-exploit, antiexploit, exploit, infection prevention, Microsoft Defender for Endpoint, Cannot retrieve contributors at this time. The package is available for download from theMicrosoft Defender for IoT portal(ClickUpdates, thenDownload file (MD5: 4fbc673742b9ca51a9721c682f404c41). 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. Attack surfaces are all the places where your organization is vulnerable to cyber threats and attacks. Below screenshot shows all the scenarios which are actively mitigated by Azure Firewall Premium. Find out more about the Microsoft MVP Award Program. You can customize the notification with your company details and contact information. The ASR rules main Configuration tab provides summary and per-device ASR rules configuration details. There are some variations in ASR rules reports. 1122 -> Event when rule fires in Audit-mode. Threat and Vulnerability recommendation Attention required: Devices found with vulnerable Apache Log4j versions. Microsoft 365 Defender detects exploitation patterns in different data sources, including cloud application traffic reported by Microsoft Defender for Cloud Apps. Once logged in you will arrive at the home page. 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. I want to know whether there is any Kusto query to run in Advanced Hunting and get the list of files in audit mode. The Webtoos malware has DDoS capabilities and persistence mechanisms that could allow an attacker to perform additional activities. Begin your attack surface reduction (ASR) rules deployment with ring 1. :::image type="content" source="images/asr-rules-testing-steps.png" alt-text="The Microsoft Defender for Endpoint (MDE) attack surface reduction (ASR rules) test steps. determines if a JAR file contains a vulnerable Log4j file by examining JAR files and searching for the following file: searches for any vulnerable Log4j-core JAR files embedded within nested-JAR by searching for paths that contain any of these strings: View the mitigation status for each affected device. In this scenario, put these users in a users group, and assign your Help Desk icon profile to this users group. If you've already registered, sign in. Warn mode is supported on devices running the following versions of Windows: Microsoft Defender Antivirus must be running with real-time protection in Active mode. [!div class="mx-imgBorder"] If you have a Microsoft Microsoft 365 Security E5 or A5, Windows E5 or A5 license, the following link opens the Microsoft Defender 365 Reports > Attack surface reductions > Detections tab. Under custom views in event viewer you will see all the ASR rules that have been audited (event 1122). :::image type="content" source="images/attack-surface-reduction-rules-report-main-configuration-tab.png" alt-text="Screenshot that shows the ASR rules report main configuration tab." Remote Code Execution rule for Default Rule Set (DRS) versions 1.0/1.1, Figure 25. In this section of the ASR rules deployment guide, you will learn how to: [!NOTE] [!TIP] Microsoft has observed attackers using many of the same inventory techniques to locate targets. Microsoft will continue to monitor this dynamic situation and will update this blog as new threat intelligence and detections/mitigations become available. Digital Footprint customers can immediately understand what may be vulnerable and act swiftly and resolutely using the Attack Surface Intelligence Dashboard Log4J Insights tab. Starting with sensor version 10.3, users can automatically receive up-to-date threat intelligence packages through Microsoft Defender for IoT. Some information relates to prereleased product which may be substantially modified before it's commercially released. Microsoft 365 Defender solutions protect against related threats. Select create policy at the top, and then a window will open to pick the operating system Platform and Profile. Attack surface reduction is a technique to remove or constrain exploitable behaviors in your systems.