HTA_WScriptShell_OneNote

YARA detection rule by marcin@ulikowski.pl · MIT

Detects suspicious OneNote documents with embedded HTA + WScript.Shell

rule HTA_WScriptShell_OneNote
{
	meta:
		description = "Detects suspicious OneNote documents with embedded HTA + WScript.Shell"
		author = "marcin@ulikowski.pl"
		date = "2023-02-01"
		hash1 = "002fe00bc429877ee2a786a1d40b80250fd66e341729c5718fc66f759387c88c"

	strings:
		$magic = { ae b1 53 78 d0 29 96 d3 }
		$hta = { 00 04 00 00 00 2e 00 68 00 74 00 61 }
		$wsh = "CreateObject(\"WScript.Shell\")"

	condition:
		filesize < 5MB and
		$magic at 8 and $wsh and $hta
}

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

7cdf340f-c76c-437c-b8fe-d5629835832c

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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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