alert dns $HOME_NET any -> any any (msg:"ET MOBILE_MALWARE iOS/Bahamut DNS Lookup 9"; dns.query; content:"referfile.com"; nocase; endswith; reference:url,blog.talosintelligence.com/2018/07/Mobile-Malware-Campaign-uses-Malicious-MDM-Part2.html; classtype:trojan-activity; sid:2025899; rev:4; metadata:affected_product iOS, attack_target Mobile_Client, created_at 2018_07_25, deployment Perimeter, malware_family iOS_Bahamut, confidence Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_16;)