alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MOBILE_MALWARE Observed Malicious SSL Cert (Android/FakeAdBlocker CnC)"; flow:from_server,established; tls.cert_subject; content:"CN=offeranda.biz"; nocase; fast_pattern; endswith; reference:url,www.welivesecurity.com/2021/07/20/url-shortener-services-android-malware-banking-sms-trojans/; classtype:domain-c2; sid:2033377; rev:1; metadata:affected_product Android, attack_target Client_and_Server, created_at 2021_07_21, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_21, mitre_tactic_id TA0042, mitre_tactic_name Resource_Development, mitre_technique_id T1587, mitre_technique_name Develop_Capabilities;)