Azure WAF guided investigation Notebook using Microsoft Sentinel for automated false positive tuning | Azure Blog and Updates

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With particular due to Pete Bryan, Principal Safety Analysis Supervisor, Microsoft Safety.

The SQL injection assault stays one of many crucial assaults within the OWASP Prime 10, and it includes injecting a SQL question by way of the enter knowledge area into an internet software with out enter validation. In keeping with Microsoft Digital Protection Report 2022, 67 p.c of net software exploits embrace SQL injections.

Azure Net Software Firewall (Azure WAF) gives centralized safety of your net functions from exploits and vulnerabilities. It protects in opposition to OWASP Prime 10 assaults, bot assaults, software layer Distributed Denial of Service (DDoS) assaults, and different net assaults.

Azure WAF detects SQL injection assaults and blocks them by default. In sure cases, this may very well be a false constructive that requires investigation and creation of Azure WAF exclusions. To finish a profitable investigation, full context concerning the assault is required and a course of that guides you thru the investigation is required.

We’re happy to announce a brand new Azure WAF guided investigation to tune WAF coverage Pocket book in preview. It guides you thru an investigation expertise to grasp the Azure WAF incidents in Microsoft Sentinel, establish false positives, and mechanically apply exclusions to WAF guidelines to deal with the false positives. This Pocket book means that you can perceive the WAF alert and pivot on key entities of the WAF occasion such because the request URI, shopper IP, hostname, and correlate with Risk Intelligence feeds to get a holistic view of the assault floor.

Azure WAF investigations powered by Microsoft Sentinel

Azure WAF is deeply built-in with Microsoft Sentinel, Microsoft’s Safety Data and Occasion Administration (SIEM) resolution. Utilizing the present Azure WAF knowledge connector, WAF logs are ingested and later analyzed for quite a lot of net software assaults and highly effective visualizations pivoting on the total assault sample are introduced to you. This Pocket book is constructed utilizing Microsoft Risk Intelligence Middle’s MSTICpy packages. With this Pocket book, you may entry wealthy historic contextual info utilizing Microsoft Sentinel’s capabilities like incident era, entity graph, and menace intelligence correlation, together with Azure WAF’s SQL injection detections primarily based on OWASP guidelines and Microsoft Risk Intelligence guidelines.

Automated investigation and mitigation of net software assaults

Our new Azure WAF guided investigation to tune WAF coverage Pocket book gives an automatic guided investigation for triaging Sentinel incidents triggered by Azure WAF SQL injection guidelines.

The answer consists of the next parts:

Azure WAF knowledge connector in Microsoft Sentinel.

Microsoft Sentinel incidents which can be generated attributable to SQL injection assault detected by the Microsoft Sentinel analytic guidelines.

Azure WAF Pocket book that helps examine Azure WAF logs and mechanically applies WAF exclusions to the WAF coverage.

A high-level diagram explaining the info move is given beneath:

High-level diagram explaining the data flow is given below: This picture describes Azure WAF protecting backends hosted in Azure, other clouds and on-premises from traffic originating from malicious actors as well as legitimate users. A WAF triggered log is analyzed by the Sentinel Notebook and an automated exclusion is applied for a confirmed false positive.

Allow us to take a look at two use case eventualities for utilizing this Pocket book:

Understanding the assault panorama when there’s a true constructive

Utilizing the Pocket book, you may pivot on varied assault artifacts corresponding to IP, URL, or area menace intelligence, and perceive the entity graph. This Pocket book retrieves the WAF SQLi rule that generated the detection and appears up associated SQLi rule occasions inside the pre-selected time. Based mostly on the above particulars, when you determine that the SQL injection assault is legitimate then you may replace the incident severity and precedence. On this state of affairs, the net software stays protected by Azure WAF.

Understanding the attack landscape when there is a true positive:This picture describes a threat actor trying to access a SQL database connected to a web application protected Azure WAF. WAF detects SQL injection attack and blocks the call. The log is analyzed in Sentinel Notebook to correlate with Threat Intelligence and visualize in the alert entity graph.

Perceive the assault sample and create exclusions if there is a false constructive

Utilizing the Pocket book, you may pivot on varied assault artifacts corresponding to IP, URL, or area menace intelligence, and perceive the entity graph. This Pocket book retrieves the WAF SQLi rule that generated the detection and appears up associated rule occasions. It additionally retrieves uncooked WAF logs to grasp the relations between the request URI, shopper Ips, hostname entities and means that you can dynamically entry the OWASP rule set in GitHub to grasp the rule match sample. Based mostly on the investigations, when you determine this incident is a false constructive, the method to mechanically create granular exclusions is introduced to you and the exclusions are utilized to the Azure WAF coverage utilizing Azure WAF APIs.

Understand the attack pattern and create exclusions when there is a false positive: This picture describes a legitimate user trying to access the web application and the first request is blocked by WAF as a SQL injection attack. This log is analyzed by the Sentinel Notebook and an automated exclusion is applied since it is confirmed as a false positive. Subsequent requests go through successfully.

The next personas would profit from this Pocket book:

Persona: Developer at SomeUnionFlight.com

Understanding SQL injection detection logic

Chris is a developer at SomeUnionFlight.com. His firm hosts an internet site for customers to seek for flights and make flight reservations. They’ve hosted their web site behind WAF with Azure Entrance Door (AFD) the place AFD accepts person requests to go looking their web site. SomeUnionFlight.com has an SQL backend the place they retailer flight info. He notices that when customers attempt to entry the web site, their entry is getting blocked as a result of the URL has “Union” key phrase which is triggering the SQL injection rule. This detection is taken into account as a false constructive as a result of the “Union” key phrase is used to say an internet site identify and never an SQL injection assault. He would really like an investigation expertise that helps him perceive find out how to analyze this detection utilizing Microsoft Sentinel and decide if it’s a false constructive. He would additionally prefer to mechanically create exclusions for false positives for the URL with out having to disable the whole rule.

Persona: SecOps analyst at Contoso.com

Understanding collateral assault vectors

Ashley is a Safety Operations analyst at Contoso.com. Her firm has bought each Azure WAF and Microsoft Sentinel. She oversees analyzing WAF logs and figuring out assault patterns. She wish to perceive if the shopper IP or the request URI related to the WAF rule that triggered the SQL injection are Indicators of Compromise (IoC). By understanding associated Risk Intelligence Indicators of Compromises, she will stop future assaults on her group.

Get began in the present day

SQL injection assaults are getting extra prevalent by the day and Azure WAF protects net functions from these assaults. To allow a high-quality investigation expertise for Azure WAF clients, we’ve created this new Azure WAF guided investigation Pocket book that permits you shortly perceive full assault floor and take actions on the incidents. You’ll be able to observe our step-by-step directions to learn to use the Pocket book.

This new Azure WAF Pocket book might be present in Microsoft Sentinel underneath the Notebooks within the Risk Administration part.

1) This picture describes that this new Notebook can be found by hovering over the Notebooks blade on the left side and searching for the keyword “WAF”. The Azure WAF – guided investigation Notebook is presented to you.