YARA · Signature Base (Florian Roth / Nextron)
SIGNATURE_BASE_SUSP_Claude_Redacted_Thinking_Magic_String_Jan26_2
Detects Base64 variations of redacted thinking magic string that cause Claude sessions to be terminated. This might indicate that a file tries to prevent being analyzed by LLM agents.
- Autor
- Marius Benthin
- Fecha
- 2026-01-29
- Modificada
- 2026-05-15
- Puntuación / Calidad
- 75 / 85
Qué detecta esta regla
Detects Base64 variations of redacted thinking magic string that cause Claude sessions to be terminated. This might indicate that a file tries to prevent being analyzed by LLM agents.
Define 1 patrones (1 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_Claude_Redacted_Thinking_Magic_String_Jan26_2
{
meta:
= "Detects Base64 variations of redacted thinking magic string that cause Claude sessions to be terminated. This might indicate that a file tries to prevent being analyzed by LLM agents."
= "Marius Benthin"
= "453ad61a-838f-529a-b119-1dd3ec559069"
= "2026-01-29"
= "2026-05-15"
= "Internal Research"
= "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/susp_claude_magic_strings.yar#L45-L57"
= "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
= "3b901ffeaff1e4bef579df00e4e99fe8f9eb4ae9ee8e8bde7a730f0fd4646762"
= 75
= 85
= ""
strings:
$xb1 = "ANTHROPIC_MAGIC_STRING_TRIGGER_REDACTED_THINKING_" ascii wide base64 base64wide
condition:
$xb1
}
Cadenas (1 patrones)
| Identificador | Tipo | Valor | Modificadores |
|---|---|---|---|
| $xb1 | texto | "ANTHROPIC_MAGIC_STRING_TRIGGER_REDACTED_THINKING_" | ascii wide base64 base64wide |
Condición
$xb1En palabras sencillas (Heurística)
- El patrón $xb1 debe estar presente.
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: Marius Benthin
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: 453ad61a-838f-529a-b119-1dd3ec559069
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