Bridging the Multi-OS Gap: Strategies for Cross-Platform SOC Defense

Hey everyone,

I just read a piece on The Hacker News discussing how fragmented SOC workflows are becoming a critical liability as attackers hop across Windows, macOS, and Linux. It really resonated with our current struggles. We have great visibility into our Windows endpoints via EDR, but our Linux infrastructure and the fleet of Macbooks used by the C-suite are basically blind spots in our incident response playbooks.

The article highlights how adversaries exploit this "platform silo" effect. If we can't correlate a suspicious SSH session originating from a compromised MacBook to our Linux production servers, we're already behind.

I've been trying to standardize some of our detection logic using KQL in our SIEM to unify events regardless of the OS. For example, looking for persistence mechanisms like scheduled tasks versus cron jobs side-by-side:

let LinuxCron = DeviceProcessEvents
| where Timestamp > ago(1h)
| where DeviceOS == "Linux"
| where FileName has "crontab"
| project Timestamp, DeviceName, AccountName, InitiatingProcessFileName, Command="CronJobMod";
let WindowsTask = DeviceProcessEvents
| where Timestamp > ago(1h)
| where DeviceOS == "Windows"
| where FileName =~ "schtasks.exe"
| project Timestamp, DeviceName, AccountName, InitiatingProcessFileName, Command="ScheduledTaskMod";
union LinuxCron, WindowsTask
| summarize count() by Command, DeviceOS, bin(Timestamp, 10m)


On the endpoint level, gathering this data requires different approaches. For Linux, I often rely on auditing the cron changes:

auditctl -w /etc/crontab -p wa -k cron_changes


While on Windows, it’s often easier to use PowerShell to look for tasks created in the last 24 hours:

Get-ScheduledTask | Where-Object {$_.Date -gt (Get-Date).AddDays(-1)} | Select-Object TaskName, TaskPath, Author

Are you guys handling this by abstracting everything into a massive SIEM correlation layer, or are you actually finding success with endpoint agents that provide normalized telemetry across all OS types? How do you handle the alert fatigue from "different" rules that are essentially catching the same behavior?