YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_EXPL_Keepass_CVE_2023_24055_Jan23

Detects suspicious entries in the Keepass configuration file, which could be indicator of the exploitation of CVE-2023-24055

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

Autor: Florian Roth (Nextron Systems)
Datum: 2023-01-25
Geändert: 2023-12-05
Score / Qualität: 75 / 81

Was diese Regel erkennt

Detects suspicious entries in the Keepass configuration file, which could be indicator of the exploitation of CVE-2023-24055

Sie definiert 6 Muster (6 Text, 0 Hex, 0 Regex).

Zusammenfassung aus den Metadaten und der Bedingung der Regel erzeugt.

Regelquelltext

.yar herunterladen

expl-keepass-cve-2023-24055-jan23.yarDetection Rule License 1.1

rule SIGNATURE_BASE_EXPL_Keepass_CVE_2023_24055_Jan23 : CVE_2023_24055 FILE
{
	meta:
		description = "Detects suspicious entries in the Keepass configuration file, which could be indicator of the exploitation of CVE-2023-24055"
		author = "Florian Roth (Nextron Systems)"
		id = "2c031919-da19-5fd0-b21a-2e83679ad1e3"
		date = "2023-01-25"
		modified = "2023-12-05"
		reference = "https://github.com/alt3kx/CVE-2023-24055_PoC"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/expl_keepass_cve_2023_24055.yar#L2-L20"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "3ca00f317838819bb7fb80c9d00d94db498e1d3ef146b9af2664dae09302a86d"
		score = 75
		quality = 81
		tags = "CVE-2023-24055, FILE"

	strings:
		$a1 = "<TriggerCollection xmlns:xsi=" ascii wide
		$x1 = "<Parameter>KeePass XML (2.x)</Parameter>"
		$x2 = "::ReadAllBytes("
		$x3 = " -Method "
		$x4 = " bypass "
		$x5 = "powershell" nocase ascii wide fullword

	condition:
		filesize < 200KB and $a1 and 1 of ( $x* )
}

Strings (6 Muster)

Bezeichner	Typ	Wert	Modifikatoren
$a1	Text	"<TriggerCollection xmlns:xsi="	ascii wide
$x1	Text	"<Parameter>KeePass XML (2.x)</Parameter>"
$x2	Text	"::ReadAllBytes("
$x3	Text	" -Method "
$x4	Text	" bypass "
$x5	Text	"powershell"	nocase ascii wide fullword

Bedingung

filesize < 200KB and $a1 and 1 of ( $x* )

In Worten (Heuristik)

Die Datei muss kleiner als 200KB sein (eine günstige Grenze, die große Dateien ausschließt).
Mindestens 1 Muster aus ( $x* ) müssen treffen.
Muster $a1 muss vorhanden sein.