YARA · Signature Base (Florian Roth / Nextron)
SIGNATURE_BASE_EXPL_LOG_CVE_2021_26858_Exchange_Forensic_Artefacts_Mar21_1
Detects forensic artefacts found in HAFNIUM intrusions exploiting CVE-2021-26858
- Autor
- Florian Roth (Nextron Systems)
- Fecha
- 2021-03-02
- Modificada
- 2021-03-04
- Puntuación / Calidad
- 65 / 85
Qué detecta esta regla
Detects forensic artefacts found in HAFNIUM intrusions exploiting CVE-2021-26858
Define 1 patrones (0 de texto, 0 hex, 1 regex).
Resumen generado a partir de los metadatos y la condición de la regla.
Código de la regla
rule SIGNATURE_BASE_EXPL_LOG_CVE_2021_26858_Exchange_Forensic_Artefacts_Mar21_1 : LOG CVE_2021_26858
{
meta:
= "Detects forensic artefacts found in HAFNIUM intrusions exploiting CVE-2021-26858"
= "Florian Roth (Nextron Systems)"
= "f6fa90c7-c2c0-56db-bf7b-dc146761a995"
= "2021-03-02"
= "2021-03-04"
= "https://www.volexity.com/blog/2021/03/02/active-exploitation-of-microsoft-exchange-zero-day-vulnerabilities/"
= "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/yara/apt_hafnium_log_sigs.yar#L15-L28"
= "https://github.com/Neo23x0/signature-base/blob/94a1c48d7ab499879287ff611dfe7f9c56376030/LICENSE"
= "0a8296b7e990e52330412288e9ff71e08a5258fc63c4754e6d0e6d64302f55e6"
= 65
= 85
= "LOG, CVE-2021-26858"
strings:
$xr1 = /POST (\/owa\/auth\/Current\/themes\/resources\/logon\.css|\/owa\/auth\/Current\/themes\/resources\/owafont_ja\.css|\/owa\/auth\/Current\/themes\/resources\/lgnbotl\.gif|\/owa\/auth\/Current\/themes\/resources\/owafont_ko\.css|\/owa\/auth\/Current\/themes\/resources\/SegoeUI-SemiBold\.eot|\/owa\/auth\/Current\/themes\/resources\/SegoeUI-SemiLight\.ttf|\/owa\/auth\/Current\/themes\/resources\/lgnbotl\.gif)/
condition:
$xr1
}
Cadenas (1 patrones)
| Identificador | Tipo | Valor | Modificadores |
|---|---|---|---|
| $xr1 | regex | /POST (\/owa\/auth\/Current\/themes\/resources\/logon\.css|\/owa\/auth\/Current\/themes\/resources\/owafont_ja\.css|\/owa\/auth\/Current\/themes\/resources\/lgn … |
Condición
$xr1En palabras sencillas (Heurística)
- El patrón $xr1 debe estar presente.
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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: f6fa90c7-c2c0-56db-bf7b-dc146761a995
Etiquetas:LOGCVE_2021_26858
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