alert dns any any -> any any (msg:"🐾 - ☠ DNS request 🌐 🎛 Get2 C2 👿 TA505"; flow:to_server, stateless; dns_query; content:"mainten-ferrum.com"; nocase; reference:url,https://www.cert.ssi.gouv.fr/ioc/CERTFR-2021-IOC-001/; reference:url,https://malpedia.caad.fkie.fraunhofer.de/actor/ta505; metadata:created_at 2021_02_15, updated_at 2021_02_15; sid:3315034; rev:1; classtype:trojan-activity;)