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 / AkteurSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Kompiliert mit YARA-X

Autor: Florian Roth
Datum: 2025-07-20
Geändert: 2025-07-24
Score / Qualität: 70 / 85

Was diese Regel erkennt

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

Sie definiert 11 Muster (11 Text, 0 Hex, 0 Regex).

Zusammenfassung aus den Metadaten und der Bedingung der Regel erzeugt.

Regelquelltext

.yar herunterladen

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
}

Strings (11 Muster)

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

Bedingung

1 of them

In Worten (Heuristik)

Mindestens 1 Muster aus der Regel müssen treffen.

Diese Regel im Browser testen

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Datei hier ablegen oder klicken zum AuswählenLokal mit YARA-X gescannt. Dateien bis 200 MB.

Im Editor öffnen

Referenzen

https://research.eye.security/sharepoint-under-siege/

Proben-Hashes

Hashes der Proben, die der Autor in den Metadaten der Regel nennt (in Ihrer Threat-Intelligence-Plattform nachschlagen).

30955794792a7ce045660bb1e1917eef36f1d5865891b8110bf982382b305b27
b336f936be13b3d01a8544ea3906193608022b40c28dd8f1f281e361c9b64e93

Lizenz & Namensnennung

Autor: Florian Roth

Quell-Repository: Signature Base (Florian Roth / Nextron) @ 94a1c48d7a

Lizenz: Detection Rule License 1.1 (Repository-Lizenz)

Originalregel

Gespiegelt über YARA Forge 20260927, das Regelnamen mit der Quelle präfixiert und normalisierte Meta-Felder ergänzt.

Regel-ID: c6f26461-04b8-5d69-bf28-e47411c38c82

Tags:CVE_2025_53770

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