Sinkholing is a technique for manipulating data flow in a network; you redirect traffic from its intended destination to the server of your choosing. It can be used maliciously, to steer legitimate traffic away from its intended recipient, but security professionals more commonly use sinkholing as a tool for research and reacting to attacks1 Sinkholing can help prevent any impact to the company from similar attacks in the future by redirecting the malicious traffic from the compromised assets to a sinkhole server, where it can be monitored, analyzed, or blocked. Sinkholing can also prevent the compromised assets from communicating with their command and control servers or exfiltrating data to remote destinations.

The order of priority for risk mitigation from highest to lowest is C, B, A, D. This order is based on applying the risk mitigation policies of the organization. According to the first policy, risks without compensating controls will be mitigated first if the risk value is greater than $50,000. Risk C has no compensating controls and a risk value of $75,000, so it is the highest priority. Risk B also has no compensating controls, but a risk value of $40,000, so it is the second priority. According to the second policy, other risk mitigation will be prioritized based on risk value. Risk A has a risk value of $60,000 and a compensating control of encryption, so it is the third priority. Risk D has a risk value of $50,000 and a compensating control of backup power supply, so it is the lowest priority.

DMARC stands for Domain-based Message Authentication, Reporting and Conformance. It is an email authentication protocol that helps prevent spoofing and phishing attacks by verifying that the sender's domain matches the domain in the email header. DMARC also provides a way for domain owners to specify how receivers should handle unauthenticated messages from their domain1

"CASB solutions generally offer their own DLP policy engine, allowing you to configure DLP policies in a CASB and apply them to cloud services." https://www.mcafee.com/blogs/enterprise/cloud-security/how-a-casb-integrates-with-an-on-premises-dlp-solution/ CASB stands for Cloud Access Security Broker, which is a solution that monitors and controls the access and usage of cloud services by an organization's users. DLP stands for Data Loss Prevention, which is a solution that prevents unauthorized disclosure or leakage of sensitive data. Utilizing the CASB to enforce DLP data-in-motion protection for financial information moving to the cloud is the best recommendation for a security analyst to mitigate the threat of financial data leakage into the cloud, because it would prevent users from uploading or transferring financial information to cloud services that are not authorized or secure. Utilizing the CASB to enforce DLP data-at-rest protection for financial information that is stored on premises, not utilizing the CASB solution for this purpose but adding DLP on premises for data in motion or data at rest are other possible recommendations, but they are not as effective or relevant as utilizing the CASB to enforce DLP data-in-motion protection for financial information moving to the cloud. Reference: https://www.csoonline.com/article/3200344/what-is-a-casb-and-why-do-you-need-one.html

Server-side input validation is a solution that can prevent cross-site scripting (XSS) vulnerabilities by checking and filtering any user input that is sent to the server before rendering it on a web page. Server-side input validation can help to ensure that the user input conforms to the expected format, length and type, and does not contain any malicious characters or syntax that may alter the logic or behavior of the web page. Server-side input validation can also reject or sanitize any input that does not meet the validation criteria .