ECCouncil 312-39 (Certified SOC Analyst) Practice Test 6

Question 50

Endpoint telemetry shows a rare process contacting the same external host every 90 seconds with near-uniform intervals. Which hypothesis is supported?

  1. A guaranteed hard-disk encryption failure
  2. Proof that a human typed each connection manually
  3. Normal SNMP polling from the organization's approved management server
  4. Automated beaconing to a possible command-and-control endpoint

Explanation

Correct Answer

D:

Regular periodic communication by an unfamiliar process can indicate a persistent agent checking in; baselines and payload context are needed to exclude legitimate updaters.

Incorrect Answers

A:

Disk encryption status is not determined from outbound connection cadence or process identity.

B:

Near-constant timing usually suggests automation; human interaction would not be inferred solely from fixed-interval traffic.

C:

A managed poller could exhibit periodic activity, but a rare endpoint process contacting an unknown host needs validation before labeling it routine.

Question 51

An otherwise trusted software update is signed by a vendor but installs a hidden downloader across many customer systems. Which threat theme should be considered?

  1. Software supply-chain compromise of a trusted distribution path
  2. A harmless patch with no need for investigation because it is signed
  3. An ordinary cross-site request forgery in a customer browser
  4. A network-only DNS cache configuration issue

Explanation

Correct Answer

A:

An adversary may abuse vendor build or update processes so victims receive malicious content through expected channels; a signature alone cannot establish intent.

Incorrect Answers

B:

A digital signature helps establish signer and integrity, but a compromised signer or build pipeline can still distribute malicious software.

C:

CSRF abuses web session authorization and does not explain malicious code distributed via an apparently legitimate software update.

D:

Resolver misconfiguration would not embed a downloader inside signed software packages delivered to many environments.

Question 52

A service account used only by a nightly backup job suddenly initiates interactive remote desktop sessions in business hours. Why is this suspicious?

  1. Unexpected interactive access by a noninteractive service identity
  2. Remote desktop activity cannot be correlated with account identity
  3. Every successful remote desktop session is inherently unauthorized
  4. Backup accounts are required to log on by RDP for each nightly job

Explanation

Correct Answer

A:

An account designed for automated background access should rarely create interactive sessions; the change could indicate credential compromise or misuse.

Incorrect Answers

B:

Authentication and host logs commonly contain account and logon-type context suitable for this investigation.

C:

Interactive access can be legitimate for human accounts; the strong anomaly here is the mismatch with this service identity's intended use.

D:

Automated backups typically use service or batch execution and do not require user-style remote desktop sessions.

Question 53

Windows Security logs show Event ID 4625 repeated against one account, followed by Event ID 4624 from the same host. What is the most useful immediate interpretation?

  1. The record shows only process creation and termination
  2. The sequence proves the account was permanently disabled
  3. The failure entries alone prove malware executed on the host
  4. Correlate the failed and successful logons by source and type

Explanation

Correct Answer

D:

Event 4625 records failed sign-ins and 4624 a successful session; connecting account, address, and timestamps can identify suspicious password-guessing success.

Incorrect Answers

A:

Windows process events involve different audit identifiers and fields, not a failed-then-successful logon sequence.

B:

Account-disabled state has separate event evidence; a subsequent successful logon does not establish permanent disablement.

C:

Repeated failures indicate authentication attempts; additional endpoint evidence is needed to assert program execution or compromise.

Question 54

An investigation needs to distinguish interactive console sign-in from a network logon recorded in Windows Event 4624. What field is most decisive?

  1. The number of entries displayed in Event Viewer
  2. The size of the event-log file in bytes
  3. Only the record's severity level
  4. The Logon Type value in the event details

Explanation

Correct Answer

D:

Windows logon types differentiate usage such as local interactive, network, service, batch, and remote interactive sessions.

Incorrect Answers

A:

Event count provides volume, not the semantics of a particular authentication session.

B:

File capacity does not characterize whether one successful sign-in was interactive or arrived across the network.

C:

Successful logons share similar audit classifications; severity does not identify how the user obtained the session.

Question 55

A SOC needs evidence of a Windows executable being started along with its parent and optional command-line context. Which native audit event is most relevant when enabled?

  1. Security Event ID 4688 for process creation
  2. Security Event ID 1102 for audit-log clearing
  3. Security Event ID 4625 for failed authentication
  4. Security Event ID 4720 for account creation

Explanation

Correct Answer

A:

A configured process-creation audit can record new process identities and related metadata, including command line when policy enables it.

Incorrect Answers

B:

A cleared audit log is important tamper evidence but not the normal record of executable creation.

C:

Failed-logon records describe unsuccessful credentials rather than the spawning of a specific executable.

D:

Account management events track user objects; they do not establish the parent-child relationship of a launched process.

Question 56

An analyst finds Windows Security Event ID 1102 near the start of a suspected compromise. What does that event indicate?

  1. The operating system installed a security patch successfully
  2. The Security audit log was cleared
  3. A user successfully completed an interactive logon
  4. A new scheduled task was necessarily registered

Explanation

Correct Answer

B:

This event warrants review of the initiating account and surrounding telemetry because clearing audit history can hide activity.

Incorrect Answers

A:

Update status is not the semantic meaning of the Security log-cleared event, which concerns loss of audit records.

C:

Successful sign-ins are recorded by a different event and cannot be inferred merely from the log-clearing identifier.

D:

Task creation appears in other event sources and does not follow automatically from evidence that audit records were cleared.

Question 57

A new local or domain user is created on a monitored Windows system. Which Security event ID should the analyst seek when account-management auditing applies?

  1. 4720, indicating a user account was created
  2. 1102, which indicates Security log deletion
  3. 4624, which is a successful sign-in record
  4. 4688, which records a process start

Explanation

Correct Answer

A:

The account-management audit provides actor and target account context valuable for investigating unexpected identity creation.

Incorrect Answers

B:

Audit history clearing is a different administrative event and does not establish account creation.

C:

A successful authentication can accompany administration but does not by itself log creation of a new user object.

D:

The process event may show an administrative utility but is not the direct account-created audit record.

Question 58

Windows domain logs contain Event ID 4728 after a suspicious admin session. What change is being reported?

  1. A database query was blocked by a web firewall
  2. A DNS client cache flush on a workstation
  3. A new member in a security-enabled global group
  4. A failed user sign-in to the domain

Explanation

Correct Answer

C:

Group-membership changes can grant privileges indirectly, so the actor, target member, and group should be reviewed.

Incorrect Answers

A:

Application-layer query inspection is not logged under this Windows account-management event ID.

B:

DNS cache management is a network resolution activity, unrelated to the security group membership audit.

D:

Authentication failures use separate logon or account-logon events and do not represent a global group modification.

Question 59

A user reports repeated lockouts. Which Windows Security event is a useful starting point for finding when the account was locked?

  1. 4720, a newly created account
  2. 1102, a cleared Security audit log
  3. 4688, a newly created process
  4. 4740, an account lockout event

Explanation

Correct Answer

D:

The record helps identify lockout timing and relevant account information, while further authentication logs are needed to find the offending client.

Incorrect Answers

A:

Identity creation is independent of an existing account reaching its lockout threshold.

B:

A cleared log signals audit disruption, not the account-lockout action that the analyst is trying to identify.

C:

Process execution may help investigate a malicious script but is not the direct account-lockout audit event.

Question 60

A defender wants to review Kerberos service ticket requests for unusual access to privileged services. Which event is relevant on domain controllers when auditing is enabled?

  1. 1102, which records Security log clearing
  2. 4625 alone, which records a generic failed logon
  3. 4688 alone, which records process creation
  4. 4769, a Kerberos service ticket request

Explanation

Correct Answer

D:

Service-ticket request records can show account, service, and ticket characteristics used to detect anomalies such as unusual service access.

Incorrect Answers

A:

Log clearing is a tampering signal, not the issuance or request of a Kerberos service ticket.

B:

Failed logons may supply context, but they are not a dedicated view of Kerberos service-ticket issuance.

C:

Process starts on endpoints do not directly replace domain-controller records for Kerberos service-ticket requests.

Certified SOC Analyst (312-39) Practice Tests