alert dns $HOME_NET any -> any any (msg:"ET MOBILE_MALWARE Trojan-Spy.AndroidOS.Femas.b DNS Lookup"; dns.query; content:"droidback.com"; startswith; nocase; endswith; fast_pattern; reference:url,securelist.com/blog/incidents/77562/breaking-the-weakest-link-of-the-strongest-chain/; classtype:trojan-activity; sid:2023936; rev:6; metadata:affected_product Android, attack_target Client_Endpoint, created_at 2017_02_16, deployment Perimeter, confidence Medium, signature_severity Major, tag Android, updated_at 2024_04_13;)