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YARA · Signature Base (Florian Roth / Nextron)

SIGNATURE_BASE_SUSP_OBFUSC_Powershell_True_Jun20_1

Detects indicators often found in obfuscated PowerShell scripts. Note: This detection is based on common characteristics typically associated with the mentioned threats, must be considered a clue and does not conclusively prove maliciousness.

Sospechoso / huntingSignature Base (Florian Roth / Nextron)Detection Rule License 1.1Compila con YARA-X
Autor
Florian Roth (Nextron Systems)
Fecha
2020-06-27
Modificada
2025-02-12
Puntuación / Calidad
75 / 85

Qué detecta esta regla

Detects indicators often found in obfuscated PowerShell scripts. Note: This detection is based on common characteristics typically associated with the mentioned threats, must be considered a clue and does not conclusively prove maliciousness.

Define 7 patrones (7 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
susp-obfusc-powershell-true-jun20-1.yarDetection Rule License 1.1
rule SIGNATURE_BASE_SUSP_OBFUSC_Powershell_True_Jun20_1 : FILE
{
	meta:
		description = "Detects indicators often found in obfuscated PowerShell scripts. Note: This detection is based on common characteristics typically associated with the mentioned threats, must be considered a clue and does not conclusively prove maliciousness."
		author = "Florian Roth (Nextron Systems)"
		id = "e9bb870b-ad72-57d3-beff-2f84a81490eb"
		date = "2020-06-27"
		modified = "2025-02-12"
		reference = "https://github.com/corneacristian/mimikatz-bypass/"
		source_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_powershell_obfuscation.yar#L57-L75"
		license_url = "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
		logic_hash = "8f33762e6e93fcf6b423b34eb1abefae2ae91b51048303947f7c1601823630d7"
		score = 75
		quality = 85
		tags = "FILE"

	strings:
		$ = "${t`rue}" ascii nocase
		$ = "${tr`ue}" ascii nocase
		$ = "${tru`e}" ascii nocase
		$ = "${t`ru`e}" ascii nocase
		$ = "${tr`u`e}" ascii nocase
		$ = "${t`r`ue}" ascii nocase
		$ = "${t`r`u`e}" ascii nocase

	condition:
		filesize < 6000KB and 1 of them
}

Cadenas (7 patrones)

IdentificadorTipoValorModificadores
$texto"${t`rue}"ascii nocase
$texto"${tr`ue}"ascii nocase
$texto"${tru`e}"ascii nocase
$texto"${t`ru`e}"ascii nocase
$texto"${tr`u`e}"ascii nocase
$texto"${t`r`ue}"ascii nocase
$texto"${t`r`u`e}"ascii nocase

Condición

filesize < 6000KB and 1 of them

En palabras sencillas (Heurística)

  • El archivo debe ocupar menos de 6000KB (un límite barato que descarta archivos grandes).
  • Deben coincidir al menos 1 patrones de la regla.

Prueba esta regla en tu navegador

Arrastra un archivo para escanearlo con esta regla usando YARA-X compilado a WebAssembly. No se sube nada.

Arrastra un archivo aquí o haz clic para elegirSe escanea en local con YARA-X. Archivos de hasta 200 MB.

Abrir en el editor

Referencias

Licencia y atribución

Autor: Florian Roth (Nextron Systems)

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: e9bb870b-ad72-57d3-beff-2f84a81490eb

Etiquetas:FILE

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