KQL Search

This query is designed to search through multiple security-related logs to identify any entries that involve specific IP addresses of interest, known as Indicators of Compromise (IOCs). Here's a breakdown of what it does:

1. Define IOCs: It starts by defining a list of IP addresses (IOCs) that are of interest. In this case, the list is currently empty (dynamic([""])), but it would typically contain IP addresses that are suspected of being involved in malicious activities.

2. Combine Logs: It combines data from several log sources: CommonSecurityLog, AzureDiagnostics, SigninLogs, and AWSCloudTrail. This means it will look for the specified IP addresses across all these different types of logs.

3. Filter by Time: It filters the logs to only include entries that were generated in the last 7 days (TimeGenerated > ago(7d)).

4. Filter by IP Address: It further filters these logs to only include entries where the IP address matches one of the IOCs. It checks several fields that might contain IP addresses (clientIP_s, clientIp_s, IPAddress, SourceIpAddress).

In summary, this query is used to find recent log entries from various sources that involve specific IP addresses of interest, helping to identify potential security threats.