YARA · Signature Base (Florian Roth / Nextron)
SIGNATURE_BASE_SUSP_Encoded_Discord_Attachment_Oct21_1
Detects suspicious encoded URL to a Discord attachment (often used for malware hosting on a legitimate FQDN)
- Autor
- Florian Roth (Nextron Systems)
- Fecha
- 2021-10-12
- Modificada
- 2025-03-21
- Puntuación / Calidad
- 70 / 85
Qué detecta esta regla
Detects suspicious encoded URL to a Discord attachment (often used for malware hosting on a legitimate FQDN)
Define 9 patrones (9 de texto, 0 hex, 0 regex).
Resumen generado a partir de los metadatos y la condición de la regla.
Código de la regla
rule SIGNATURE_BASE_SUSP_Encoded_Discord_Attachment_Oct21_1 : FILE
{
meta:
= "Detects suspicious encoded URL to a Discord attachment (often used for malware hosting on a legitimate FQDN)"
= "Florian Roth (Nextron Systems)"
= "06c086f4-8b79-5506-9e3f-b5d099106157"
= "2021-10-12"
= "2025-03-21"
= "Internal Research"
= "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/gen_suspicious_strings.yar#L431-L456"
= "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
= "1ea5a83e91b5c5b4b8a1d507c365bc1583394c97a28b7d7a576f085854676769"
= 70
= 85
= "FILE"
strings:
$enc_b01 = "Y2RuLmRpc2NvcmRhcHAuY29tL2F0dGFjaG1lbnRz" ascii wide
$enc_b02 = "Nkbi5kaXNjb3JkYXBwLmNvbS9hdHRhY2htZW50c" ascii wide
$enc_b03 = "jZG4uZGlzY29yZGFwcC5jb20vYXR0YWNobWVudH" ascii wide
$enc_b04 = "AGMAZABuAC4AZABpAHMAYwBvAHIAZABhAHAAcAAuAGMAbwBtAC8AYQB0AHQAYQBjAGgAbQBlAG4AdABz" ascii wide
$enc_b05 = "BjAGQAbgAuAGQAaQBzAGMAbwByAGQAYQBwAHAALgBjAG8AbQAvAGEAdAB0AGEAYwBoAG0AZQBuAHQAc" ascii wide
$enc_b06 = "AYwBkAG4ALgBkAGkAcwBjAG8AcgBkAGEAcABwAC4AYwBvAG0ALwBhAHQAdABhAGMAaABtAGUAbgB0AH" ascii wide
$enc_h01 = "63646E2E646973636F72646170702E636F6D2F6174746163686D656E7473" ascii wide
$enc_h02 = "63646e2e646973636f72646170702e636f6d2f6174746163686d656e7473" ascii wide
$enc_r01 = "stnemhcatta/moc.ppadrocsid.ndc" ascii wide
condition:
filesize < 5000KB and 1 of them
}
Cadenas (9 patrones)
| Identificador | Tipo | Valor | Modificadores |
|---|---|---|---|
| $enc_b01 | texto | "Y2RuLmRpc2NvcmRhcHAuY29tL2F0dGFjaG1lbnRz" | ascii wide |
| $enc_b02 | texto | "Nkbi5kaXNjb3JkYXBwLmNvbS9hdHRhY2htZW50c" | ascii wide |
| $enc_b03 | texto | "jZG4uZGlzY29yZGFwcC5jb20vYXR0YWNobWVudH" | ascii wide |
| $enc_b04 | texto | "AGMAZABuAC4AZABpAHMAYwBvAHIAZABhAHAAcAAuAGMAbwBtAC8AYQB0AHQAYQBjAGgAbQBlAG4AdABz" | ascii wide |
| $enc_b05 | texto | "BjAGQAbgAuAGQAaQBzAGMAbwByAGQAYQBwAHAALgBjAG8AbQAvAGEAdAB0AGEAYwBoAG0AZQBuAHQAc" | ascii wide |
| $enc_b06 | texto | "AYwBkAG4ALgBkAGkAcwBjAG8AcgBkAGEAcABwAC4AYwBvAG0ALwBhAHQAdABhAGMAaABtAGUAbgB0AH" | ascii wide |
| $enc_h01 | texto | "63646E2E646973636F72646170702E636F6D2F6174746163686D656E7473" | ascii wide |
| $enc_h02 | texto | "63646e2e646973636f72646170702e636f6d2f6174746163686d656e7473" | ascii wide |
| $enc_r01 | texto | "stnemhcatta/moc.ppadrocsid.ndc" | ascii wide |
Condición
filesize < 5000KB and 1 of themEn palabras sencillas (Heurística)
- El archivo debe ocupar menos de 5000KB (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.
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)
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: 06c086f4-8b79-5506-9e3f-b5d099106157
Etiquetas:FILE
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