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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_Royalroad_Code_Pattern4Ce

Detects RoyalRoad weaponized RTF documents

GenericSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compiles with YARA-X
Author
nao_sec
Date
2020-01-15
Modified
2023-12-05
Score / Quality
80 / 85

What this rule detects

Detects RoyalRoad weaponized RTF documents

It defines 2 patterns (2 text, 0 hex, 0 regex).

Summary generated from the rule's metadata and condition.

Rule source

Download .yar
royalroad-code-pattern4ce.yarDetection Rule License 1.1
rule SIGNATURE_BASE_Royalroad_Code_Pattern4Ce : FILE
{
	meta:
		description = "Detects RoyalRoad weaponized RTF documents"
		author = "nao_sec"
		id = "c6e8a072-23cd-5f6a-9b4f-57d3e4500d13"
		date = "2020-01-15"
		modified = "2023-12-05"
		reference = "https://jsac.jpcert.or.jp/archive/2020/pdf/JSAC2020_8_koike-nakajima_jp.pdf"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_royalroad.yar#L94-L109"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "7033c5874b406341a68f761b45fd6a9b73a9875c80b14d52a7c2240202c8fb40"
		score = 80
		quality = 85
		tags = "FILE"

	strings:
		$S1 = "584242eb064242423535333620446060606060606060606161616161616161616161616}1616161" ascii
		$RTF = "{\\rt"

	condition:
		$RTF at 0 and $S1
}

Strings (2 patterns)

IdentifierTypeValueModifiers
$S1text"584242eb064242423535333620446060606060606060606161616161616161616161616}1616161"ascii
$RTFtext"{\\rt"

Condition

$RTF at 0 and $S1

In plain words (Heuristic)

  • Pattern $RTF must be found at offset 0.
  • Pattern $S1 must be present.

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References

Licence & attribution

Author: nao_sec

Source repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licence: Detection Rule License 1.1 (repository licence)

Original rule

Mirrored via YARA Forge 20260927, which prefixes rule names with the source and adds normalised meta fields.

Rule id: c6e8a072-23cd-5f6a-9b4f-57d3e4500d13

Tags:FILE

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