Question 290
An improvement plan must address recurrence after this case: A domain controller records privileged authentication from a compromised workstation followed by remote service creation. What should the owner add to the normal control review to reduce recurrence?
- Detect unusual command-line patterns and restrict remote administration exposure
- Join authentication events with remote service installation and source-host timing
- Use tiered administration and remote-service creation monitoring
- Rotate affected credentials and remove unauthorized services after forensic collection
Explanation
Correct Answer
C:Separation of privileged use limits credential theft blast radius; it makes the lesson about whether stolen credentials enabled lateral movement part of normal operations.
Incorrect Answers
A:Context-aware behavioral policies distinguish abuse from valid operations; the other incident centers on whether living-off-the-land execution masks malicious behavior, not this recurrence prevention question about whether stolen credentials enabled lateral movement.
B:The sequence ties credential use to code execution on another machine; the requirement concerns whether stolen credentials enabled lateral movement, so an investigation is not recurrence prevention.
D:Restoration requires removal of both access and persistence; case recovery is not future-risk control in the decision about whether stolen credentials enabled lateral movement.
Question 291
While full remediation remains pending, the commander receives this incident report: The incident team stores a decryption key only inside the infected server's local password vault. Which first protective measure directly limits the situation without assuming cleanup is finished?
- Test authorized access to recovery material with the server disconnected
- Coordinate isolation decisions with clinical safety owners and segment affected devices
- Validate that a clean recovery environment can retrieve the protected key
- Secure an authorized independent copy of the recovery key under dual control
Explanation
Correct Answer
D:Off-host custody permits restoration without relying on the infected machine; the action limits the impact connected to whether recovery keys remain accessible during host isolation without assuming the underlying flaw is already gone.
Incorrect Answers
A:A credential trapped on compromised infrastructure is not a usable emergency recovery asset; the requirement concerns whether recovery keys remain accessible during host isolation, so investigation alone does not control current conditions.
B:Patient-care continuity must be considered alongside attack containment; this serves whether malware response preparation covers critical medical endpoints, whereas the requested result is initial containment or preservation involving whether recovery keys remain accessible during host isolation.
C:Access testing catches dependency failure before an emergency; corrective follow-through follows initial protection in the decision about whether recovery keys remain accessible during host isolation.
Question 292
A security analyst is asked to validate the following reported behavior: A finance workstation still allows unsigned macros from internet-downloaded spreadsheets. Which check can confirm the relevant facts before a disruptive action?
- Disable unauthorized macro execution and quarantine the offending attachment
- Block internet-origin macros and use signed workflows for approved automation
- Review download origin, browser events and installer signature information
- Inspect Office macro trust state, file origin markings and process ancestry
Explanation
Correct Answer
D:Internet-origin macros provide an avoidable initial execution surface; that evidence directly tests the concern about whether document execution controls are effective, rather than relying on a single unverified indicator.
Incorrect Answers
A:Control prevents additional users from invoking the same script; when judging whether document execution controls are effective, immediate protection does not substantiate findings; this is instead initial containment or preservation.
B:Trusted authoring controls reduce malware entry opportunities; for whether document execution controls are effective, prevention is not incident verification; evidence validation remains necessary.
C:An untrusted web installer differs from centrally managed software distribution; the relevant condition for that step is why user-driven fake updates bypassed approved channels, which is not shown for whether document execution controls are effective.
Question 293
The incident owner requests a defensible factual determination after hearing: A compromised Linux server runs a malicious cron job as root while the executing file has changed hashes repeatedly. What fact-checking activity tests the observed failure most directly?
- Audit privileged cron modifications and restrict write access to job directories
- Review cron entries, file histories and spawned command lines
- Review service registry or unit definitions and outbound fetch records
- Disable the offending cron entry and prevent outbound payload retrieval
Explanation
Correct Answer
B:The scheduled execution pattern remains stable even when payload bytes rotate; it makes the determination of why signature-only cleanup fails defensible and reviewable by the incident owner.
Incorrect Answers
A:Change monitoring targets persistence rather than static hashes; for why signature-only cleanup fails, prevention is not incident verification; evidence validation remains necessary.
C:A startup downloader can replenish malware removed from the filesystem; the relevant condition for that step is whether startup configuration will reinfect the system, which is not shown for why signature-only cleanup fails.
D:Blocking the trigger interrupts periodic reinfection; immediate protection does not substantiate findings in the decision about why signature-only cleanup fails.
Question 294
Active first response is underway for the following condition: A malicious browser download installs a local proxy that intercepts user sessions. What is the most appropriate short-term restriction or first-response decision?
- Disable the malicious startup entry and block its known distribution endpoint
- Remove malicious proxy components and distrust injected certificates
- Disable the unauthorized proxy and isolate the endpoint for credential assessment
- Compare system proxy settings, installed certificates and process listeners
Explanation
Correct Answer
C:Stopping interception prevents additional session capture; this is a first-response safeguard for whether a configuration-based interception remains active, not a substitute for full root-cause analysis.
Incorrect Answers
A:Both trigger and destination must be addressed to interrupt re-execution; the activity targets whether startup configuration will reinfect the system; initial containment or preservation here concerns whether a configuration-based interception remains active.
B:Recovering safe transport requires reversing configuration and trust changes; when judging whether a configuration-based interception remains active, corrective follow-through follows initial protection; this is instead trusted restoration.
D:Local proxy changes can redirect traffic even after the original installer exits; the requirement concerns whether a configuration-based interception remains active, so investigation alone does not control current conditions.
Question 295
A long-term control assessment uses this recent event: A ransomware affiliate disables volume shadow copies just before encrypting departmental data. Which change provides measurable prevention rather than an emergency workaround?
- Alert on unauthorized backup deletion and maintain immutable offline copies
- Rebuild affected systems and recover from protected backups verified clean
- Use least-privilege share access and immutable backup protection
- Correlate backup-management commands with file-encryption onset
Explanation
Correct Answer
A:Protection outside attacker control improves recoverability; the assurance measure is designed around whether backup-suppression activity is part of the attack, rather than hiding the reported activity.
Incorrect Answers
B:Local shadow copies may be unavailable or untrustworthy; for whether backup-suppression activity is part of the attack, case recovery is not future-risk control; recurrence prevention remains necessary.
C:Reduced write permissions and protected copies limit future losses; the other incident centers on which containment step stops ongoing encryption, not this recurrence prevention question about whether backup-suppression activity is part of the attack.
D:Destructive backup commands help establish intent and attack chronology; the goal is recurrence prevention for whether backup-suppression activity is part of the attack. An investigation is not recurrence prevention.
Question 296
The team needs temporary protection and must retain evidence. The observed event is: Multiple staff reuse local administrator passwords across laptops infected by a credential stealer. What narrowly scoped action would best control the immediate risk?
- Use unique managed local administrator passwords with least privilege
- Narrow or revoke unsafe exclusions after testing legitimate workloads
- Rotate affected local passwords and verify no unauthorized sessions remain
- Restrict exposed administrative access and isolate endpoints using the same credentials
- Compare local administrator credential reuse and lateral authentication logs
Explanation
Correct Answer
D:The attacker should not retain easy access to parallel machines; it restricts the path implicated in why one infected device can lead to many endpoint logins; later eradication and restoration remain separate decisions.
Incorrect Answers
A:Non-reusable local secrets contain compromise impact; for why one infected device can lead to many endpoint logins, prevention cannot replace immediate action; initial containment or preservation remains necessary.
B:Restoring visibility reduces malware concealment without needlessly blocking builds; the relevant condition for that step is whether broad exclusions hide malware execution, which is not shown for why one infected device can lead to many endpoint logins.
C:Credential renewal removes the reusable access route; the goal is initial containment or preservation for why one infected device can lead to many endpoint logins. Corrective follow-through follows initial protection.
E:Shared secrets can turn a single theft into broad access; the case needs initial containment or preservation addressing why one infected device can lead to many endpoint logins; investigation alone does not control current conditions.
Question 297
Cleanup is not considered complete. The case record describes: A compromised Windows host shows legitimate system tools executing encoded commands from a remote management channel. Which remediation task is necessary rather than merely suppressing the visible symptom?
- Remove the associated persistence and examine credentials used by the process
- Detect unusual command-line patterns and restrict remote administration exposure
- Remove unauthorized remote-access persistence and reset impacted credentials
- Revoke the unauthorized remote session and isolate its affected host
Explanation
Correct Answer
C:Cleanup should follow the actor's access mechanism, not simply delete OS utilities; the affected workflow should not be considered trusted until the issue of whether living-off-the-land execution masks malicious behavior is resolved.
Incorrect Answers
A:Eradication must address how the unwanted process restarts or maintains access; the activity targets whether the host exhibits domain-generation command traffic; trusted restoration here concerns whether living-off-the-land execution masks malicious behavior.
B:Context-aware behavioral policies distinguish abuse from valid operations; when judging whether living-off-the-land execution masks malicious behavior, future hardening is not current-state recovery; this is instead recurrence prevention.
D:Containing the access channel disrupts abuse even when binaries are legitimate; the requirement concerns whether living-off-the-land execution masks malicious behavior, so temporary protection does not complete correction.
Question 298
A case advances from immediate protection to root-cause correction after: Memory scanning reveals injected code in a legitimate browser process although no malicious file exists on disk. What remaining assessment or remediation is justified after the immediate response?
- Remove the imposter and investigate how it was launched
- Monitor remote thread creation and anomalous process-memory access
- Isolate the host and suspend suspicious injected activity under forensic procedures
- Investigate the injector and persistence mechanism before rebuilding the endpoint
Explanation
Correct Answer
D:A clean browser executable does not exclude compromise in the process tree; response staff can use these findings about whether in-memory execution explains the alert to decide what eradication and recovery actually require.
Incorrect Answers
A:Startup links or scripts can recreate the fraudulent process; the relevant condition for that step is whether a process name is being spoofed, which is not shown for whether in-memory execution explains the alert.
B:Behavioral telemetry can detect fileless injection; the requirement concerns whether in-memory execution explains the alert, so future hardening is not current-state recovery.
C:The active process may still communicate even with a clean disk scan; the goal is post-containment assessment for whether in-memory execution explains the alert. Temporary protection does not complete correction.
Question 299
A control owner is preparing preventive actions after observing: A compromised Windows host shows legitimate system tools executing encoded commands from a remote management channel. What tested hardening or process measure follows from the lessons learned?
- Detect unusual command-line patterns and restrict remote administration exposure
- Decode and correlate command-line telemetry with parent process and remote session source
- Remove unauthorized remote-access persistence and reset impacted credentials
- Use tiered administration and remote-service creation monitoring
Explanation
Correct Answer
A:Context-aware behavioral policies distinguish abuse from valid operations; a periodic review of this safeguard can track the risk described by whether living-off-the-land execution masks malicious behavior.
Incorrect Answers
B:Signed utilities can still run attacker instructions that reveal intent; an investigation is not recurrence prevention in the decision about whether living-off-the-land execution masks malicious behavior.
C:Cleanup should follow the actor's access mechanism, not simply delete OS utilities; the case needs recurrence prevention addressing whether living-off-the-land execution masks malicious behavior; case recovery is not future-risk control.
D:Separation of privileged use limits credential theft blast radius; the activity targets whether stolen credentials enabled lateral movement; recurrence prevention here concerns whether living-off-the-land execution masks malicious behavior.
Question 300
To prevent the next similar event, analysts review this case: A server repeatedly creates an unfamiliar scheduled task that launches a remote script at midnight. Which preventive change targets the exact pathway that failed?
- Harden Office child-process restrictions and PowerShell telemetry
- Remove the malicious task and validate other startup mechanisms
- Alert on unusual scheduled-task registration by non-administrative workflows
- Inspect scheduled-task definitions, creation events and task action paths
Explanation
Correct Answer
C:Monitoring persistence changes provides earlier detection; the control owner can test whether this reduces repeat conditions affecting which persistence artifact causes recurring execution.
Incorrect Answers
A:Application controls reduce this common execution chain; that method could help with whether a document triggered script-based malware; the recurrence prevention decision here involves which persistence artifact causes recurring execution.
B:Cleanup should ensure the attacker did not create a second trigger; the goal is recurrence prevention for which persistence artifact causes recurring execution. Case recovery is not future-risk control.
D:These records identify the launch target and the identity establishing persistence; the case needs recurrence prevention addressing which persistence artifact causes recurring execution; an investigation is not recurrence prevention.