A global enterprise uses XSIAM and has different security policies for its various business units (BUS). A new XSIAM detection rule, Malware_Execution_Attempt', is critical for all BUS. However, BU 'FinTech' uses a highly specialized financial application that, due to its sandboxed environment, generates benign process anomalies that are falsely triggering this rule. The SOC team wants to implement an exclusion that is: 1) specific to BU 'FinTech', 2) applies only to alerts, and 3) dynamically excludes specific 'process.hash' values that are known to be benign but vary slightly with each application update. Which combination of XSIAM features would best achieve this, and how would it be architected?
Correct Answer: A
Option A is the most comprehensive and resilient solution. It combines several key XSIAM features: 1. Asset Tagging : Allows for logical grouping of assets by BIJ, making the exclusion specific to FinTech without relying on volatile IP ranges. 2. External Dynamic List (EDL) : Solves the problem of dynamically changing benign process hashes. An external script automates the update of this list, ensuring the exclusion remains current without manual intervention. 3. Targeted Exclusion : Applying the exclusion directly to the rule with 'AND' conditions ensures that the exclusion is only triggered when both the asset belongs to FinTech and the process hash is on the dynamic benign list. This prevents broad exclusions and maintains detection fidelity for other malicious activities. Option B is less maintainable due to manual hash updates and rule modification. Option C is reactive and consumes XSOAR resources for every alert. Option D is too broad as it doesn't filter by process hash and requires manual updates. Option E only changes severity, not preventing alert generation, which is undesirable for false positives.
XSIAM-Engineer Exam Question 82
A newly installed Cortex XSIAM Engine consistently fails to onboard new endpoints, reporting 'Agent connection failed: certificate validation error' in the Engine's logs. Existing, previously onboarded endpoints continue to communicate successfully. Further investigation reveals that the XSIAM tenant was recently updated to a newer version, and the XSIAM Engine itself passed its health checks after the update. What is the most likely root cause, and how would you resolve it?
Correct Answer: B
The key phrase here is 'existing, previously onboarded endpoints continue to communicate successfully' while 'newly installed' endpoints fail with a certificate validation error after a 'tenant was recently updated'. This strongly suggests a certificate mismatch related to the tenant's update. When a Cortex XSIAM tenant is updated, it's possible that the certificates used for agent onboarding and communication are also updated. Existing agents might have already trusted the previous certificate chain, while new agents, encountering the new certificates, fail validation if their trust store isn't updated or if there's a misconfiguration in how the new certificate is presented. The XSIAM Engine itself might also need to explicitly trust the new tenant certificates. Option A is a possibility, but less likely to affect only new agents. Option C would affect all agents, not just new ones. Option D would manifest as other errors (e.g., storage full). Option E is less likely, as protocol versions are generally backward- compatible or explicitly announced as breaking changes, and the error specifically mentions certificate validation, not protocol. Therefore, certificate chain updates related to the tenant upgrade are the most plausible cause.
XSIAM-Engineer Exam Question 83
An XSIAM engineer is investigating a persistent alert from an indicator rule that flags 'attempts to modify critical system files.' The rule's current XQL is: After analysis, it's determined that legitimate patching and antivirus updates are triggering these alerts. How should the engineer refine this rule to eliminate these false positives while preserving detection of malicious activity?
Correct Answer: C
Option C is the most effective and robust solution for handling legitimate updates. Digital Signatures: Legitimate patching and antivirus updates are almost always performed by digitally signed executables from trusted vendors (like Microsoft for OS updates, or a reputable AV vendor). By filtering based on the absence of a valid, trusted digital signature, you can effectively distinguish legitimate updates from malicious attempts to modify system files. This is a high-fidelity filter. Option A is a surrender. Option B is a partial solution, as patchers and installers can use various processes and parent processes, and 'Trustedlnstaller.exe' might not always be the direct parent, also it's often more reliable to use signatures. Option D would eliminate many legitimate updates, as SYSTEM often performs these, and also miss malicious activity by SYSTEM. Option E would completely miss malicious modifications to critical DLLS, which is a common technique.
XSIAM-Engineer Exam Question 84
An XSIAM playbook integrated with an internal CMDB via a custom integration is consistently failing on an action that updates a CMDB entry. The playbook logs show a 403 Forbidden error from the CMDB API. The XSIAM integration configuration uses client certificate authentication for the CMDB. You have verified that the client certificate is valid and not expired, and the CMDB endpoint is reachable. Which two factors are most likely contributing to this '403 Forbidden' error?
Correct Answer: B,E
A '403 Forbidden' error typically indicates that the request was understood by the server but the client is not authorized to perform the action. When client certificate authentication is in play, the server (CMDB) validates the certificate itself. If the CNISAN of that certificate isn't recognized or whitelisted on the CMDB side for access (B), it will return a 403. Even if the certificate is technically valid and trusted, the identity associated with it (often mapped to an internal user or role in the CMDB) might not have the necessary permissions for that specific 'update' operation (E). Option A is incorrect because RBAC within XSIAM would typically prevent the playbook from starting or reaching the external call, not result in a 403 from the external system. Option C is less likely to cause a 403; incorrect headers might cause a 400 Bad Request or a parsing error, but not necessarily forbidden. Option D (CMDB server cert untrusted) would typically result in an SSL handshake error, not a 403.
XSIAM-Engineer Exam Question 85
A critical XSIAM automation playbook is designed to respond to ransomware attacks by isolating affected hosts and triggering a forensic snapshot. The playbook's reliability is paramount. Due to potential network latency or API rate limits, the external API calls (e.g., for host isolation to an EDR, and snapshot to a backup solution) might occasionally fail or timeout. What advanced XSIAM playbook features and best practices should be integrated to ensure resilience and successful execution even with transient failures?
Correct Answer: B
To ensure resilience in the face of transient network or API issues, implementing 'Retry Policies' with exponential backoff for individual external API call actions is crucial. This allows the playbook to automatically reattempt failed actions after increasing delays, accommodating temporary service disruptions. Additionally, setting 'Timeout' values for individual steps prevents the playbook from hanging indefinitely if an external service is unresponsive. Option A is too blunt; C is inefficient; D is detrimental; E compromises the automated response for critical incidents.
