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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_APT_EXPL_Sharepoint_CVE_2025_53770_Forensicartefact_Jul25_2

Detects URIs accessed during the exploitation of SharePoint RCE vulnerability CVE-2025-53770

APT / actorSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compila con YARA-X
Autor
Florian Roth
Fecha
2025-07-20
Modificada
2025-07-24
Puntuación / Calidad
70 / 85

Qué detecta esta regla

Detects URIs accessed during the exploitation of SharePoint RCE vulnerability CVE-2025-53770

Define 11 patrones (11 de texto, 0 hex, 0 regex).

Resumen generado a partir de los metadatos y la condición de la regla.

Código de la regla

Descargar .yar
apt-expl-sharepoint-cve-2025-53770-forensicartefact-jul25-2.yarDetection Rule License 1.1
rule SIGNATURE_BASE_APT_EXPL_Sharepoint_CVE_2025_53770_Forensicartefact_Jul25_2 : CVE_2025_53770
{
	meta:
		description = "Detects URIs accessed during the exploitation of SharePoint RCE vulnerability CVE-2025-53770"
		author = "Florian Roth"
		id = "c6f26461-04b8-5d69-bf28-e47411c38c82"
		date = "2025-07-20"
		modified = "2025-07-24"
		reference = "https://research.eye.security/sharepoint-under-siege/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/expl_sharepoint_jul25.yar#L76-L106"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		hash = "30955794792a7ce045660bb1e1917eef36f1d5865891b8110bf982382b305b27"
		hash = "b336f936be13b3d01a8544ea3906193608022b40c28dd8f1f281e361c9b64e93"
		logic_hash = "5ae0620e7e1c1908ad54ac4e41c53240f738631c20577fd65fb29008945347a8"
		score = 70
		quality = 85
		tags = "CVE-2025-53770"

	strings:
		$x1 = "-EncodedCommand JABiAGEAcwBlADYANABTAHQAcgBpAG4AZwAgAD0" ascii wide
		$x2 = "TEMPLATE\\LAYOUTS\\spinstall" ascii wide
		$x3 = "TEMPLATE\\LAYOUTS\\ghostfile" ascii wide
		$x4 = "TEMPLATE\\LAYOUTS\\1.css" ascii wide
		$x5 = "Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:120.0)+Gecko/20100101+Firefox/120.0 /_layouts/SignOut.aspx" ascii wide
		$xe1 = "TQBJAEMAUgBPAFMAfgAxAFwAVwBFAEIAUwBFAFIAfgAxAFwAMQA2AFwAVABFAE0AUABMAEEAVABFAFwATABBAFkATwBVAFQAUwBcA"
		$xe2 = "0ASQBDAFIATwBTAH4AMQBcAFcARQBCAFMARQBSAH4AMQBcADEANgBcAFQARQBNAFAATABBAFQARQBcAEwAQQBZAE8AVQBUAFMAXA"
		$xe3 = "NAEkAQwBSAE8AUwB+ADEAXABXAEUAQgBTAEUAUgB+ADEAXAAxADYAXABUAEUATQBQAEwAQQBUAEUAXABMAEEAWQBPAFUAVABTAFwA"
		$xe4 = "TQBJAEMAUgBPAFMAfgAxAFwAVwBFAEIAUwBFAFIAfgAxAFwAMQA1AFwAVABFAE0AUABMAEEAVABFAFwATABBAFkATwBVAFQAUwBcA"
		$xe5 = "0ASQBDAFIATwBTAH4AMQBcAFcARQBCAFMARQBSAH4AMQBcADEANQBcAFQARQBNAFAATABBAFQARQBcAEwAQQBZAE8AVQBUAFMAXA"
		$xe6 = "NAEkAQwBSAE8AUwB+ADEAXABXAEUAQgBTAEUAUgB+ADEAXAAxADUAXABUAEUATQBQAEwAQQBUAEUAXABMAEEAWQBPAFUAVABTAFwA"

	condition:
		1 of them
}

Cadenas (11 patrones)

IdentificadorTipoValorModificadores
$x1texto"-EncodedCommand JABiAGEAcwBlADYANABTAHQAcgBpAG4AZwAgAD0"ascii wide
$x2texto"TEMPLATE\\LAYOUTS\\spinstall"ascii wide
$x3texto"TEMPLATE\\LAYOUTS\\ghostfile"ascii wide
$x4texto"TEMPLATE\\LAYOUTS\\1.css"ascii wide
$x5texto"Mozilla/5.0+(Windows+NT+10.0;+Win64;+x64;+rv:120.0)+Gecko/20100101+Firefox/120.0 /_layouts/SignOut.aspx"ascii wide
$xe1texto"TQBJAEMAUgBPAFMAfgAxAFwAVwBFAEIAUwBFAFIAfgAxAFwAMQA2AFwAVABFAE0AUABMAEEAVABFAFwATABBAFkATwBVAFQAUwBcA"
$xe2texto"0ASQBDAFIATwBTAH4AMQBcAFcARQBCAFMARQBSAH4AMQBcADEANgBcAFQARQBNAFAATABBAFQARQBcAEwAQQBZAE8AVQBUAFMAXA"
$xe3texto"NAEkAQwBSAE8AUwB+ADEAXABXAEUAQgBTAEUAUgB+ADEAXAAxADYAXABUAEUATQBQAEwAQQBUAEUAXABMAEEAWQBPAFUAVABTAFwA"
$xe4texto"TQBJAEMAUgBPAFMAfgAxAFwAVwBFAEIAUwBFAFIAfgAxAFwAMQA1AFwAVABFAE0AUABMAEEAVABFAFwATABBAFkATwBVAFQAUwBcA"
$xe5texto"0ASQBDAFIATwBTAH4AMQBcAFcARQBCAFMARQBSAH4AMQBcADEANQBcAFQARQBNAFAATABBAFQARQBcAEwAQQBZAE8AVQBUAFMAXA"
$xe6texto"NAEkAQwBSAE8AUwB+ADEAXABXAEUAQgBTAEUAUgB+ADEAXAAxADUAXABUAEUATQBQAEwAQQBUAEUAXABMAEEAWQBPAFUAVABTAFwA"

Condición

1 of them

En palabras sencillas (Heurística)

  • Deben coincidir al menos 1 patrones de la regla.

Prueba esta regla en tu navegador

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Referencias

Hashes de muestras

Hashes de las muestras que el autor lista en los metadatos de la regla (búscalos en tu plataforma de threat intelligence).

  • 30955794792a7ce045660bb1e1917eef36f1d5865891b8110bf982382b305b27
  • b336f936be13b3d01a8544ea3906193608022b40c28dd8f1f281e361c9b64e93

Licencia y atribución

Autor: Florian Roth

Repositorio de origen: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Licencia: Detection Rule License 1.1 (licencia del repositorio)

Regla original

Obtenida a través de YARA Forge 20260927, que añade a los nombres el prefijo de la fuente y campos meta normalizados.

Id de la regla: c6f26461-04b8-5d69-bf28-e47411c38c82

Etiquetas:CVE_2025_53770

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