Question 370
An unauthorized script appears to launch every night under a service account. Which scheduling mechanism should be examined?
- /proc runtime view
- Cron persistence
- systemd journal
- utmp/wtmp logon accounting
Explanation
Correct Answer
B:Cron tables and cron directories define scheduled commands on many Linux systems. Inspect the relevant user's schedule and system-wide jobs with permissions and timestamps.
Incorrect Answers
A:A case involving live Linux process descriptors and memory mappings might use this approach: /proc exposes process and kernel runtime state such as fd links, status and maps; the required result here is recurring Linux time-based job execution. Its contents change as processes exit and should be collected promptly; it cannot replace proof about recurring Linux time-based job execution.
C:Although the case asks about recurring Linux time-based job execution, systemd-journald can store service, kernel and boot-associated entries with structured fields; the action instead concerns structured Linux service events for a given boot. Persistence and retention depend on journal configuration; it does not establish recurring Linux time-based job execution.
D:For an analysis centered on historical Linux login sessions, wtmp-related records can document login and logout activity, subject to rotation and tampering; the present need is recurring Linux time-based job execution. Current session views such as utmp answer a different temporal question; a different finding about recurring Linux time-based job execution is still needed.
Question 371
A custom binary restarts automatically under a named unit after the machine reboots. Which configuration is relevant?
- lastlog records
- systemd service persistence
- Linux auditd events
- /proc runtime view
Explanation
Correct Answer
B:systemd unit files define service execution, dependencies and restart policies. Unit enablement and journal records can explain recurring launches.
Incorrect Answers
A:Even though the scenario needs Linux service configuration that enables persistence, lastlog information may show last login times by account on systems using it; the action relates to most recent login record per local account. It is not a complete list of all authentications and may be absent or outdated; this remains insufficient for Linux service configuration that enables persistence.
C:The objective here is Linux service configuration that enables persistence; auditd records kernel audit events according to loaded rules, including account and syscall context; the option would instead inform policy-defined Linux security audit operations. Coverage depends on the rules effective before the incident; it is not direct evidence of Linux service configuration that enables persistence.
D:For a separate investigation of live Linux process descriptors and memory mappings, /proc exposes process and kernel runtime state such as fd links, status and maps; that is not the determination of Linux service configuration that enables persistence in the stem. Its contents change as processes exit and should be collected promptly; the evidence still must speak to Linux service configuration that enables persistence.
Question 372
On a running Linux host, investigators need a process's open file descriptors and current mappings. Which virtual filesystem supplies those views?
- /proc runtime view
- systemd journal
- Linux auditd events
- Secure log RHEL
Explanation
Correct Answer
A:/proc exposes process and kernel runtime state such as fd links, status and maps. Its contents change as processes exit and should be collected promptly.
Incorrect Answers
B:In work concerning structured Linux service events for a given boot, systemd-journald can store service, kernel and boot-associated entries with structured fields; the operation would not resolve live Linux process descriptors and memory mappings. Persistence and retention depend on journal configuration; the distinction leaves live Linux process descriptors and memory mappings unsettled.
C:A case involving policy-defined Linux security audit operations might use this approach: auditd records kernel audit events according to loaded rules, including account and syscall context; the required result here is live Linux process descriptors and memory mappings. Coverage depends on the rules effective before the incident; it cannot replace proof about live Linux process descriptors and memory mappings.
D:The required finding is about live Linux process descriptors and memory mappings; systems using rsyslog often place authentication and security records in /var/log/secure; this addresses the separate concern of authentication events on Red Hat-family systems. Configuration and modern journaling can change where events are found; it does not by itself answer live Linux process descriptors and memory mappings.
Question 373
A Unix investigator wants historic login-session records rather than only current authenticated users. Which accounting source may help?
- Bash history
- Secure log RHEL
- utmp/wtmp logon accounting
- Auth log SSH entries
Explanation
Correct Answer
C:wtmp-related records can document login and logout activity, subject to rotation and tampering. Current session views such as utmp answer a different temporal question.
Incorrect Answers
A:The current inquiry asks about historical Linux login sessions; shell history files can contain previously entered commands, though sessions, settings and deliberate suppression affect completeness; this mechanism chiefly addresses commands entered in an interactive shell. They are not authoritative execution logs; it cannot prove historical Linux login sessions on its own.
B:In an inquiry concerning authentication events on Red Hat-family systems, systems using rsyslog often place authentication and security records in /var/log/secure; the scope does not extend to historical Linux login sessions. Configuration and modern journaling can change where events are found; that issue cannot settle historical Linux login sessions.
D:For the separate question of SSH authentication attempts on Debian-family Linux, on many Debian-based systems, /var/log/auth.log contains authentication events including SSH and sudo activity, depending on logging configuration; the requested assessment of historical Linux login sessions remains open. Journal records may also be relevant; there is no direct finding about historical Linux login sessions.
Question 374
A responder wants to know the most recent recorded login for each local user on a Linux system. Which facility is relevant?
- /proc runtime view
- utmp/wtmp logon accounting
- Auth log SSH entries
- lastlog records
Explanation
Correct Answer
D:lastlog information may show last login times by account on systems using it. It is not a complete list of all authentications and may be absent or outdated.
Incorrect Answers
A:For questions about live Linux process descriptors and memory mappings, /proc exposes process and kernel runtime state such as fd links, status and maps; that differs from most recent login record per local account. Its contents change as processes exit and should be collected promptly; it provides no direct answer to most recent login record per local account.
B:The stem asks about most recent login record per local account; wtmp-related records can document login and logout activity, subject to rotation and tampering; the described operation is used for historical Linux login sessions. Current session views such as utmp answer a different temporal question; a determination about most recent login record per local account requires other support.
C:Instead of a method addressing most recent login record per local account, on many Debian-based systems, /var/log/auth.log contains authentication events including SSH and sudo activity, depending on logging configuration; this one concerns SSH authentication attempts on Debian-family Linux. Journal records may also be relevant; it cannot independently determine most recent login record per local account.
Question 375
A host is configured to audit specified file access and process system calls. Which source gives the most targeted security audit records?
- Linux auditd events
- Auth log SSH entries
- utmp/wtmp logon accounting
- lastlog records
- Secure log RHEL
Explanation
Correct Answer
A:auditd records kernel audit events according to loaded rules, including account and syscall context. Coverage depends on the rules effective before the incident.
Incorrect Answers
B:When the investigative task is SSH authentication attempts on Debian-family Linux, on many Debian-based systems, /var/log/auth.log contains authentication events including SSH and sudo activity, depending on logging configuration; that differs from the question about policy-defined Linux security audit operations. Journal records may also be relevant; that leaves policy-defined Linux security audit operations unresolved.
C:The current inquiry asks about policy-defined Linux security audit operations; wtmp-related records can document login and logout activity, subject to rotation and tampering; this mechanism chiefly addresses historical Linux login sessions. Current session views such as utmp answer a different temporal question; it cannot prove policy-defined Linux security audit operations on its own.
D:In an inquiry concerning most recent login record per local account, lastlog information may show last login times by account on systems using it; the scope does not extend to policy-defined Linux security audit operations. It is not a complete list of all authentications and may be absent or outdated; that issue cannot settle policy-defined Linux security audit operations.
E:Even though the scenario needs policy-defined Linux security audit operations, systems using rsyslog often place authentication and security records in /var/log/secure; the action relates to authentication events on Red Hat-family systems. Configuration and modern journaling can change where events are found; this remains insufficient for policy-defined Linux security audit operations.
Question 376
An investigator seeks filesystem change notifications for directories on a Mac even after some files were moved. Which artifact is useful?
- FSEvents records
- TCC database
- Unified log predicate search
- LaunchAgents plist
Explanation
Correct Answer
A:FSEvents records path-level filesystem changes for indexed volumes, with retention and detail limitations. It does not provide full file contents or direct user intent.
Incorrect Answers
B:With macOS filesystem change history as the investigative issue, transparency, Consent and Control databases store privacy-related authorization decisions where accessible; the result would concern macOS app privacy authorization state. Grant semantics and database locations vary by system version; this would not resolve macOS filesystem change history.
C:For questions about selective querying of macOS structured logs, unified log tools can filter structured messages by process, subsystem, category and time; that differs from macOS filesystem change history. Filters improve focus but underlying logging privacy and retention still constrain evidence; it provides no direct answer to macOS filesystem change history.
D:The stem asks about macOS filesystem change history; launchAgents define per-user or session-level jobs managed by launchd; the described operation is used for macOS user-session startup jobs. Their location and configuration help identify login persistence distinct from system daemons; a determination about macOS filesystem change history requires other support.
Question 377
A Mac user's device usage patterns and app activities are under investigation. Which database can supply certain contextual activity records?
- Recent Items plist
- macOS keychain
- TCC database
- KnowledgeC database
Explanation
Correct Answer
D:KnowledgeC and related CoreDuet artifacts can retain usage and device activity context, dependent on macOS version and permissions. Interpret entries using platform-specific schemas.
Incorrect Answers
A:The required finding is about contextual macOS application usage data; recent-items preference data may retain references to recently used resources, varying by macOS version; this addresses the separate concern of macOS recently used resource references. These hints are not exhaustive proof of opening content; it does not by itself answer contextual macOS application usage data.
B:Although the case asks about contextual macOS application usage data, keychain services store protected secrets and certificate-related items with access policies; the action instead concerns protected macOS credentials and certificates. Extraction depends on authorization, unlocked state and cryptographic protections; it does not establish contextual macOS application usage data.
C:For an analysis centered on macOS app privacy authorization state, transparency, Consent and Control databases store privacy-related authorization decisions where accessible; the present need is contextual macOS application usage data. Grant semantics and database locations vary by system version; a different finding about contextual macOS application usage data is still needed.
Question 378
An application was downloaded through a browser and origin URL evidence may survive. Which macOS database is relevant?
- FSEvents records
- macOS keychain
- Recent Items plist
- QuarantineEventsV2
Explanation
Correct Answer
D:The quarantine events database can associate downloaded files with agents and origin information where recorded. Entries may be deleted or absent for other transfer methods.
Incorrect Answers
A:For the separate question of macOS filesystem change history, FSEvents records path-level filesystem changes for indexed volumes, with retention and detail limitations; the requested assessment of macOS download provenance events remains open. It does not provide full file contents or direct user intent; there is no direct finding about macOS download provenance events.
B:The objective here is macOS download provenance events; keychain services store protected secrets and certificate-related items with access policies; the option would instead inform protected macOS credentials and certificates. Extraction depends on authorization, unlocked state and cryptographic protections; it is not direct evidence of macOS download provenance events.
C:For a separate investigation of macOS recently used resource references, recent-items preference data may retain references to recently used resources, varying by macOS version; that is not the determination of macOS download provenance events in the stem. These hints are not exhaustive proof of opening content; the evidence still must speak to macOS download provenance events.
Question 379
An examiner wants a user's recently referenced applications and documents on a Mac. Which user configuration artifact family is relevant?
- QuarantineEventsV2
- FSEvents records
- KnowledgeC database
- Recent Items plist
- LaunchDaemons plist
Explanation
Correct Answer
D:Recent-items preference data may retain references to recently used resources, varying by macOS version. These hints are not exhaustive proof of opening content.
Incorrect Answers
A:In work concerning macOS download provenance events, the quarantine events database can associate downloaded files with agents and origin information where recorded; the operation would not resolve macOS recently used resource references. Entries may be deleted or absent for other transfer methods; the distinction leaves macOS recently used resource references unsettled.
B:A case involving macOS filesystem change history might use this approach: FSEvents records path-level filesystem changes for indexed volumes, with retention and detail limitations; the required result here is macOS recently used resource references. It does not provide full file contents or direct user intent; it cannot replace proof about macOS recently used resource references.
C:The required finding is about macOS recently used resource references; knowledgeC and related CoreDuet artifacts can retain usage and device activity context, dependent on macOS version and permissions; this addresses the separate concern of contextual macOS application usage data. Interpret entries using platform-specific schemas; it does not by itself answer macOS recently used resource references.
E:For an analysis centered on macOS system-level background startup jobs, launchDaemons configure system-level launchd jobs, usually outside ordinary user sessions; the present need is macOS recently used resource references. Analyze plist paths, permissions and executable targets; a different finding about macOS recently used resource references is still needed.
Question 380
A Mac inquiry must distinguish programs configured for a user login session from background jobs loaded at system startup without user sign-in. Which TWO launchd configuration families correspond to these modes? Choose TWO.
- LaunchAgents plist
- Recent Items plist
- macOS keychain
- Unified log predicate search
- LaunchDaemons plist
Explanation
Correct Answers
A:In this combined inquiry, launchAgents define per-user or session-level jobs managed by launchd; their location and configuration help identify login persistence distinct from system daemons. This addresses macOS user-session startup jobs.
E:In this combined inquiry, launchDaemons configure system-level launchd jobs, usually outside ordinary user sessions; analyze plist paths, permissions and executable targets. This addresses macOS system-level background startup jobs.
Incorrect Answers
B:Even though the scenario needs both macOS user-session startup jobs and macOS system-level background startup jobs, recent-items preference data may retain references to recently used resources, varying by macOS version; the action relates to macOS recently used resource references. These hints are not exhaustive proof of opening content; this remains insufficient for both macOS user-session startup jobs and macOS system-level background startup jobs.
C:For the separate question of protected macOS credentials and certificates, keychain services store protected secrets and certificate-related items with access policies; the requested assessment of both macOS user-session startup jobs and macOS system-level background startup jobs remains open. Extraction depends on authorization, unlocked state and cryptographic protections; there is no direct finding about both macOS user-session startup jobs and macOS system-level background startup jobs.
D:The objective here is both macOS user-session startup jobs and macOS system-level background startup jobs; unified log tools can filter structured messages by process, subsystem, category and time; the option would instead inform selective querying of macOS structured logs. Filters improve focus but underlying logging privacy and retention still constrain evidence; it is not direct evidence of both macOS user-session startup jobs and macOS system-level background startup jobs.