Unusual Scheduled Task

KQL detection rule by reversinglabs · MIT

identifies new scheduled tasks created in an unusual location

// description: identifies new scheduled tasks created in an unusual location
let AppDataRegex = @"(?i).*C:\\Users\\.*\\AppData\\Local\\Temp\\.*";
DeviceProcessEvents
| where FileName == "schtasks.exe"
| where ProcessCommandLine matches regex AppDataRegex
| union 
(SysmonParser
| where EventID == 1
| where OriginalFileName == "schtasks.exe"
| where CommandLine matches regex AppDataRegex),
(SecurityEvent
| where EventID == 4688
| where Process == "schtasks.exe"
| where CommandLine matches regex AppDataRegex)

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

02577a86-3460-4eb9-8a34-eb7a5e16efa9

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

[[ reason ]]

What does this mean?

Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

[[ reason ]]

What do these messages mean?

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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