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CAS-003 · Question #537

A company recently implemented a variety of security services to detect various types of traffic that pose a threat to the company. The following services were enabled within the network: - Scan of…

The correct answer is B. User behavioral analytics. User Behavioral Analytics (UBA/UEBA) detects anomalous user activity by baselining normal behavior and alerting on deviations such as unusually large data transfers to external destinations.

Enterprise Security Operations

Question

A company recently implemented a variety of security services to detect various types of traffic that pose a threat to the company. The following services were enabled within the network:

  • Scan of specific subsets for vulnerabilities
  • Categorizing and logging of website traffic
  • Enabling specific ACLs based on application traffic
  • Sending suspicious files to a third-party site for validation

A report was sent to the security team that identified multiple incidents of users sharing large amounts of data from an on-premise server to a public site. A small percentage of that data also contained malware and spyware Which of the following services MOST likely identified the behavior and sent the report?

Options

  • AContent filter
  • BUser behavioral analytics
  • CApplication sandbox
  • DWeb application firewall
  • EEndpoint protection
  • FCloud security broker

How the community answered

(25 responses)
  • A
    4% (1)
  • B
    52% (13)
  • C
    12% (3)
  • E
    24% (6)
  • F
    8% (2)

Why each option

User Behavioral Analytics (UBA/UEBA) detects anomalous user activity by baselining normal behavior and alerting on deviations such as unusually large data transfers to external destinations.

AContent filter

A content filter categorizes and blocks website traffic by URL or category but does not analyze user-specific behavioral patterns or detect volume anomalies in data transfers.

BUser behavioral analyticsCorrect

UBA establishes behavioral baselines for each user and generates alerts when activity deviates significantly - such as transferring large volumes of data from an on-premise server to a public site - making it the service most capable of detecting this type of data exfiltration and generating the described report. It correlates user actions over time and across sessions rather than inspecting individual packets or files in isolation, which is why it also surfaced the embedded malware and spyware as part of the broader anomaly.

CApplication sandbox

An application sandbox executes suspicious files in an isolated environment to detect malware behavior, not to identify anomalous user data-sharing patterns across the network.

DWeb application firewall

A web application firewall inspects HTTP/S traffic to protect web applications from injection and other exploit-based attacks, not to monitor internal user behavior or flag data exfiltration volumes.

EEndpoint protection

Endpoint protection detects and blocks malware on individual devices but does not aggregate or correlate user behavior patterns across the network to identify systematic exfiltration.

FCloud security broker

A cloud access security broker monitors and enforces policy for cloud service usage, but the data source in this scenario is an on-premise server, and CASB does not perform the user-behavior baseline analysis that UBA provides.

Concept tested: User behavioral analytics for insider threat and data exfiltration detection

Source: https://csrc.nist.gov/publications/detail/sp/800-137/final

Topics

#user behavioral analytics#data exfiltration#DLP#security monitoring

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