Newprocess Onenotemshta

KQL detection rule by reversinglabs · MIT

this query detects when onenote spawns a new mshta process

// this query detects when onenote spawns a new mshta process
SecurityEvent
| where EventID == 4688 
| where ParentProcessName has @"\onenote.exe"
| where NewProcessName has @"\mshta.exe"
| union (SysmonParser
| where EventID == 1
| where ParentImage has @"\onenote.exe"
| where OriginalFileName == "mshta.exe"),
(DeviceProcessEvents
| where InitiatingProcessFileName == "onenote.exe"
| where FileName == "mshta.exe")

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

1ac944cb-3be5-4661-bfd6-494b3e19c308

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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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