Question 670
A regional SOC analyst is asked to resolve this problem: A FortiGate IPS log records a high-severity signature match, and the SOC announces confirmed compromise without checking the action or server evidence. What preventive practice should be standardized for this FortiAnalyzer workflow?
Explanation
Correct Answer
This safeguard directly addresses ips signature versus exploitation evidence: Require corroboration for claims of successful exploitation and preserve the original IPS log record. The risk being prevented is: An IPS signature detection shows matched suspicious traffic but does not alone prove payload execution or compromise on the target. A safeguard aimed at another fault would not control this issue.
Incorrect Answers
An external translated address alone may represent many internal sources and cannot uniquely identify one initiating host. “Retain full session and translation fields needed to attribute shared-address events during investigations” would remedy that alternative situation, but it would not correct the present issue: an IPS signature detection shows matched suspicious traffic but does not alone prove payload execution or compromise on the target.
“Document session-boundary assumptions before comparing analytics buckets to connection counts” is the supported response when long-lived flows can contribute usage across report windows, and time aggregation does not necessarily correspond to new session creation. Here the decisive response is “Require corroboration for claims of successful exploitation and preserve the original IPS log record”, so that different intervention does not meet the stated requirement.
An antivirus detection identifies a suspicious object, but the configured security action determines whether delivery was blocked or allowed. “Record the response action and endpoint evidence for every significant malware detection” applies to that other condition. The reported evidence is a FortiGate IPS log records a high-severity signature match, and the SOC announces confirmed compromise without checking the action or server evidence; this alternative would address the wrong dependency.