Question 310
Cleanup is not considered complete. The case record describes: An endpoint's network isolation is reversed automatically by an unapproved management script. Which remediation task is necessary rather than merely suppressing the visible symptom?
- Suspend the conflicting automation and apply an authorized network quarantine
- Test incident overrides against routine endpoint management jobs
- Correct automation ownership and verify containment survives a policy cycle
- Scan and rebuild affected endpoints and sanitize or retire contaminated media
Explanation
Correct Answer
C:Durable remediation requires fixing the conflicting control; technical closure should demonstrate that the control gap behind why malware containment does not persist is actually corrected.
Incorrect Answers
A:Isolation must remain effective while active compromise is investigated; the case needs trusted restoration addressing why malware containment does not persist; temporary protection does not complete correction.
B:Runbook integration prevents accidental de-isolation; when judging why malware containment does not persist, future hardening is not current-state recovery; this is instead recurrence prevention.
D:Cleanup must cover both endpoints and the transport vehicle; that method could help with whether removable media caused repeated reinfections; the trusted restoration decision here involves why malware containment does not persist.
Question 311
Following initial stabilization, the team must prove recovery for this case: An application server begins mining cryptocurrency and generating high CPU usage from a newly deployed container image. Choose THREE actions that separately (1) verify the reported facts, (2) protect against immediate harm and (3) correct the underlying failure before service returns. (Choose THREE.)
- Redeploy from a verified image and rotate exposed workload secrets
- Stop the offending container and restrict its egress while preserving metadata
- Use host firewalls, patch management and lateral-movement detections
- Detect unusual NXDOMAIN bursts and rare-domain patterns
- Compare image provenance, running process tree and outbound mining-pool traffic
- Sign and scan images and restrict unapproved registry sources
Explanation
Correct Answers
A:A compromised image or credential can persist across simple restarts; within the combined response for whether a malicious image is responsible for compute abuse, this supplies trusted restoration: the owner can validate the correction against the evidence bearing on whether a malicious image is responsible for compute abuse.
B:Containment stops resource theft without necessarily destroying the image evidence; within the combined response for whether a malicious image is responsible for compute abuse, this supplies initial containment or preservation: the action limits the impact connected to whether a malicious image is responsible for compute abuse without assuming the underlying flaw is already gone.
E:Container identity and runtime behavior establish whether the workload is compromised; within the combined response for whether a malicious image is responsible for compute abuse, this supplies evidence validation: the review should retain source and timing information relevant to whether a malicious image is responsible for compute abuse.
Incorrect Answers
C:Layered controls reduce workstation-to-workstation spread; that method could help with whether a worm propagated laterally; the trusted restoration decision here involves whether a malicious image is responsible for compute abuse.
D:Behavioral rules can catch domain rotation without static block lists; the relevant condition for that step is whether the host exhibits domain-generation command traffic, which is not shown for whether a malicious image is responsible for compute abuse.
F:Software supply-chain controls reduce malicious workload deployment; the goal is trusted restoration for whether a malicious image is responsible for compute abuse. Future hardening is not current-state recovery.
Question 312
The first task is to corroborate an alert. The case notes state: Ransomware starts encrypting a file share while snapshots remain healthy and accessible. What should the investigator examine to distinguish a substantiated finding from an assumption?
- Use least-privilege share access and immutable backup protection
- Correlate backup-management commands with file-encryption onset
- Disconnect the infected client and revoke its write access to the share
- Correlate file rename bursts with the initiating process and SMB session
Explanation
Correct Answer
D:Identifying the source host helps stop active write activity; it makes the determination of which containment step stops ongoing encryption defensible and reviewable by the incident owner.
Incorrect Answers
A:Reduced write permissions and protected copies limit future losses; the case needs evidence validation addressing which containment step stops ongoing encryption; prevention is not incident verification.
B:Destructive backup commands help establish intent and attack chronology; it is meant to address whether backup-suppression activity is part of the attack, not evidence validation for which containment step stops ongoing encryption.
C:Stopping the active writer limits damage while preserving clean snapshots; for which containment step stops ongoing encryption, immediate protection does not substantiate findings; evidence validation remains necessary.
Question 313
The response team seeks the relevant control point for this problem: A malicious binary uses a trusted signed application to load a sidecar library from a writable directory. Investigators need both a defensible factual finding and a limited immediate safeguard. Which TWO actions jointly satisfy those requirements? (Choose TWO.)
- Replace altered components and fix writable library paths
- Control executable search paths and monitor unsigned modules in sensitive applications
- Examine module-load telemetry, library path and file creation times
- Quarantine the tampered application directory and block execution of the sidecar module
- Alert on system-like process names executing from writable directories
Explanation
Correct Answers
C:A legitimate executable can load a malicious library from an unsafe search location; within the combined response for whether DLL side-loading caused the activity, this supplies evidence validation: it makes the determination of whether DLL side-loading caused the activity defensible and reviewable by the incident owner.
D:Containing the loading path prevents repeated execution without blaming the signer alone; within the combined response for whether DLL side-loading caused the activity, this supplies initial containment or preservation: this is a first-response safeguard for whether DLL side-loading caused the activity, not a substitute for full root-cause analysis.
Incorrect Answers
A:Cleaning only the signed executable misses the malicious dependency; when judging whether DLL side-loading caused the activity, corrective follow-through follows initial protection; this is instead trusted restoration.
B:Reducing side-loading opportunities makes abuse harder; for whether DLL side-loading caused the activity, prevention cannot replace immediate action; initial containment or preservation remains necessary.
E:Path-aware monitoring distinguishes impersonation from normal OS activity; the other incident centers on whether a process name is being spoofed, not this initial containment or preservation question about whether DLL side-loading caused the activity.
Question 314
The initial scene or threat protection decision concerns the following: Following cleanup, responders cannot explain why the same malicious service reappears after a configuration-management run. The first response plan must document the reported condition AND limit near-term harm. Select TWO case-specific steps. (Choose TWO.)
- Compare management manifests and agent execution times with service recreation
- Protect build systems and require approval for baseline configuration changes
- Pause the offending deployment job and quarantine its source artifacts
- Repair the trusted image or manifest and redeploy only signed verified content
- Make EDR-health checks a formal exit criterion for quarantine
Explanation
Correct Answers
A:A compromised image or script can reinstall artifacts on clean endpoints; within the combined response for whether deployment automation is reintroducing malware, this supplies evidence validation: the review should retain source and timing information relevant to whether deployment automation is reintroducing malware.
C:Stopping distribution prevents repeated contamination; within the combined response for whether deployment automation is reintroducing malware, this supplies initial containment or preservation: the action limits the impact connected to whether deployment automation is reintroducing malware without assuming the underlying flaw is already gone.
Incorrect Answers
B:Supply-chain integrity is part of malware prevention; when judging whether deployment automation is reintroducing malware, prevention cannot replace immediate action; this is instead recurrence prevention.
D:Root-cause cleanup must include the software distribution pipeline; the requirement concerns whether deployment automation is reintroducing malware, so corrective follow-through follows initial protection.
E:Monitoring continuity reduces silent reinfection; the activity targets whether recovery validation includes monitoring health; initial containment or preservation here concerns whether deployment automation is reintroducing malware.
Question 315
A containment decision is required for this incident: A workstation repeatedly contacts algorithmically generated domains after an unexplained process starts at login. The incident owner wants a corroborating check and a protective action before recovery begins. Which TWO choices fit these separate tasks? (Choose TWO.)
- Remove unauthorized remote-access persistence and reset impacted credentials
- Detect unusual NXDOMAIN bursts and rare-domain patterns
- Correlate DNS query sequences with process creation and network connections
- Isolate the host's outbound traffic and preserve relevant DNS telemetry
- Remove the associated persistence and examine credentials used by the process
Explanation
Correct Answers
C:High-volume pseudo-random lookups tied to one process support a DGA hypothesis; within the combined response for whether the host exhibits domain-generation command traffic, this supplies evidence validation: the objective is to establish whether the host exhibits domain-generation command traffic; the result can then guide the later protective decision.
D:The block curbs command retrieval while retaining host evidence; within the combined response for whether the host exhibits domain-generation command traffic, this supplies initial containment or preservation: the immediate response addresses whether the host exhibits domain-generation command traffic while the team preserves relevant case records.
Incorrect Answers
A:Cleanup should follow the actor's access mechanism, not simply delete OS utilities; the other incident centers on whether living-off-the-land execution masks malicious behavior, not this initial containment or preservation question about whether the host exhibits domain-generation command traffic.
B:Behavioral rules can catch domain rotation without static block lists; the goal is initial containment or preservation for whether the host exhibits domain-generation command traffic. Prevention cannot replace immediate action.
E:Eradication must address how the unwanted process restarts or maintains access; when judging whether the host exhibits domain-generation command traffic, corrective follow-through follows initial protection; this is instead trusted restoration.
Question 316
A technical closure review begins after this incident: A malicious browser download installs a local proxy that intercepts user sessions. After the immediate situation is stabilized, what addresses the enabling failure?
- Compare system proxy settings, installed certificates and process listeners
- Limit local proxy changes and monitor certificate trust-store modifications
- Disable the unauthorized proxy and isolate the endpoint for credential assessment
- Remove malicious proxy components and distrust injected certificates
- Restore service configuration from trusted baselines and inspect related startup entries
Explanation
Correct Answer
D:Recovering safe transport requires reversing configuration and trust changes; it is the corrective action needed for whether a configuration-based interception remains active after the immediate hazard is controlled.
Incorrect Answers
A:Local proxy changes can redirect traffic even after the original installer exits; for whether a configuration-based interception remains active, verification is not the corrective step; trusted restoration remains necessary.
B:Configuration integrity blocks a less visible malware persistence route; the requirement concerns whether a configuration-based interception remains active, so future hardening is not current-state recovery.
C:Stopping interception prevents additional session capture; the goal is trusted restoration for whether a configuration-based interception remains active. Temporary protection does not complete correction.
E:Completeness matters because multiple persistence mechanisms can coexist; the activity targets whether startup configuration will reinfect the system; trusted restoration here concerns whether a configuration-based interception remains active.
Question 317
Before making any disruptive change, an investigator is handed these observations: A ransomware affiliate disables volume shadow copies just before encrypting departmental data. Which source best supports the incident finding before responders modify the environment?
- Correlate USB insertion logs with first execution time on each affected station
- Alert on unauthorized backup deletion and maintain immutable offline copies
- Correlate backup-management commands with file-encryption onset
- Terminate the offending execution and secure isolated recovery repositories
- Rebuild affected systems and recover from protected backups verified clean
Explanation
Correct Answer
C:Destructive backup commands help establish intent and attack chronology; it connects the question of whether backup-suppression activity is part of the attack to an observable record and a reproducible check.
Incorrect Answers
A:Device-use chronology can link a shared medium to infection; this serves whether removable media caused repeated reinfections, whereas the requested result is evidence validation involving whether backup-suppression activity is part of the attack.
B:Protection outside attacker control improves recoverability; the goal is evidence validation for whether backup-suppression activity is part of the attack. Prevention is not incident verification.
D:Protecting remaining copies is crucial before broader restoration; the case needs evidence validation addressing whether backup-suppression activity is part of the attack; immediate protection does not substantiate findings.
E:Local shadow copies may be unavailable or untrustworthy; when judging whether backup-suppression activity is part of the attack, recovery is not factual verification; this is instead trusted restoration.
Question 318
The incident owner requests a defensible factual determination after hearing: An endpoint shows a new kernel driver shortly before security agents begin failing. What fact-checking activity tests the observed failure most directly?
- Capture process memory, memory maps and injection-related events
- Enforce driver-signing policies and restrict driver installation privileges
- Disconnect the endpoint using an external network control if host sensors are untrusted
- Inspect driver-load events, signature status and kernel integrity indicators
Explanation
Correct Answer
D:A suspicious driver can interfere with EDR visibility and operating-system protections; the objective is to establish whether low-level tampering explains sensor loss; the result can then guide the later protective decision.
Incorrect Answers
A:Runtime evidence can reveal payloads invisible to file-only scanning; this serves whether in-memory execution explains the alert, whereas the requested result is evidence validation involving whether low-level tampering explains sensor loss.
B:Preventive controls limit unauthorized kernel code execution; the requirement concerns whether low-level tampering explains sensor loss, so prevention is not incident verification.
C:Out-of-band isolation avoids reliance on a potentially disabled agent; the goal is evidence validation for whether low-level tampering explains sensor loss. Immediate protection does not substantiate findings.
Question 319
A containment decision is required for this incident: A Windows endpoint contains an executable masquerading as a system process in a user-writable folder. The incident owner wants a corroborating check and a protective action before recovery begins. Which TWO choices fit these separate tasks? (Choose TWO.)
- Alert on unusual scheduled-task registration by non-administrative workflows
- Alert on system-like process names executing from writable directories
- Quarantine the user-writable binary and isolate related process execution
- Replace altered components and fix writable library paths
- Check signer, executable path, hash and parent process rather than display name
- Remove the imposter and investigate how it was launched
Explanation
Correct Answers
C:Action against the real file avoids disrupting the genuine operating-system component; within the combined response for whether a process name is being spoofed, this supplies initial containment or preservation: it restricts the path implicated in whether a process name is being spoofed; later eradication and restoration remain separate decisions.
E:A familiar name outside the expected protected directory can mask malware; within the combined response for whether a process name is being spoofed, this supplies evidence validation: this evidence is scoped to whether a process name is being spoofed, not a generic system-health reading.
Incorrect Answers
A:Monitoring persistence changes provides earlier detection; it is meant to address which persistence artifact causes recurring execution, not initial containment or preservation for whether a process name is being spoofed.
B:Path-aware monitoring distinguishes impersonation from normal OS activity; the goal is initial containment or preservation for whether a process name is being spoofed. Prevention cannot replace immediate action.
D:Cleaning only the signed executable misses the malicious dependency; that method could help with whether DLL side-loading caused the activity; the initial containment or preservation decision here involves whether a process name is being spoofed.
F:Startup links or scripts can recreate the fraudulent process; for whether a process name is being spoofed, corrective follow-through follows initial protection; initial containment or preservation remains necessary.
Question 320
A technical closure review begins after this incident: Security monitoring sees an unsigned PowerShell process spawning from a downloaded Office document. After the immediate situation is stabilized, what addresses the enabling failure?
- Remove the malicious task and validate other startup mechanisms
- Remove the malicious document and persistence and check secondary payloads
- Harden Office child-process restrictions and PowerShell telemetry
- Correlate Office process ancestry with PowerShell command-line and script block logs
- Suspend the malicious process tree and isolate the endpoint for collection
Explanation
Correct Answer
B:The first script may only download or launch further components; the affected workflow should not be considered trusted until the issue of whether a document triggered script-based malware is resolved.
Incorrect Answers
A:Cleanup should ensure the attacker did not create a second trigger; the other incident centers on which persistence artifact causes recurring execution, not this trusted restoration question about whether a document triggered script-based malware.
C:Application controls reduce this common execution chain; the goal is trusted restoration for whether a document triggered script-based malware. Future hardening is not current-state recovery.
D:Parent-child and script evidence connect the document action to execution; verification is not the corrective step in the decision about whether a document triggered script-based malware.
E:Targeted interruption limits payload activity while retaining execution history; the case needs trusted restoration addressing whether a document triggered script-based malware; temporary protection does not complete correction.