Azure WAF guided investigation Pocket book utilizing Microsoft Sentinel for automated false optimistic tuning

With particular because of Pete Bryan, Principal Safety Analysis Supervisor, Microsoft Safety.

The SQL injection assault stays one of many important assaults within the OWASP Top 10, and it includes injecting a SQL question by way of the enter knowledge discipline into an internet software with out enter validation. In line with Microsoft Digital Defense Report 2022, 67 p.c of internet software exploits embody SQL injections.

Azure Internet Utility Firewall (Azure WAF) gives centralized safety of your internet 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 internet assaults.

Azure WAF detects SQL injection assaults and blocks them by default. In sure cases, this could possibly be a false optimistic 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 policy Notebook in preview. It guides you thru an investigation expertise to grasp the Azure WAF incidents in Microsoft Sentinel, establish false positives, and robotically apply exclusions to WAF guidelines to handle the false positives. This Pocket book permits you to perceive the WAF alert and pivot on key entities of the WAF occasion such because the request URI, shopper IP, hostname, and correlate with Menace Intelligence feeds to get a holistic view of the assault floor.

Table of Contents

Azure WAF investigations powered by Microsoft Sentinel

Azure WAF is deeply built-in with Microsoft Sentinel, Microsoft’s Safety Data and Occasion Administration (SIEM) answer. Utilizing the present Azure WAF knowledge connector, WAF logs are ingested and later analyzed for a wide range of internet software assaults and highly effective visualizations pivoting on the total assault sample are introduced to you. This Pocket book is constructed utilizing Microsoft Threat Intelligence Center’s MSTICpy packages. With this Pocket book, you possibly can entry wealthy historic contextual data utilizing Microsoft Sentinel’s capabilities like incident technology, entity graph, and menace intelligence correlation, at the side of Azure WAF’s SQL injection detections primarily based on OWASP guidelines and Microsoft Menace Intelligence guidelines.

Automated investigation and mitigation of internet software assaults

Our new Azure WAF guided investigation to tune WAF policy Notebook 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 might be generated as a consequence of SQL injection assault detected by the Microsoft Sentinel analytic guidelines.

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

A high-level diagram explaining the information circulate is given beneath:

Allow us to have a look at two use case situations for utilizing this Pocket book:

Understanding the assault panorama when there’s a true optimistic

Utilizing the Pocket book, you possibly can pivot on varied assault artifacts akin 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, if you happen to determine that the SQL injection assault is legitimate then you possibly can replace the incident severity and precedence. On this situation, the online software stays protected by Azure WAF.

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

Utilizing the Pocket book, you possibly can pivot on varied assault artifacts akin 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 permits you to dynamically entry the OWASP rule set in GitHub to grasp the rule match sample. Based mostly on the investigations, if you happen to determine this incident is a false optimistic, the method to robotically create granular exclusions is introduced to you and the exclusions are utilized to the Azure WAF coverage utilizing Azure WAF APIs.

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 consumer requests to look their web site. SomeUnionFlight.com has an SQL backend the place they retailer flight data. 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 optimistic as a result of the “Union” key phrase is used to say an internet site title and never an SQL injection assault. He would love an investigation expertise that helps him perceive the way to analyze this detection utilizing Microsoft Sentinel and decide if it’s a false optimistic. He would additionally prefer to robotically 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 want 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 Menace Intelligence Indicators of Compromises, she will be able to stop future assaults on her group.

Get began right this moment

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

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