alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE Android/xDrop Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"slave.php"; endswith; http.user_agent; content:"Apache-HttpClient/UNAVAILABLE ("; startswith; fast_pattern; http.request_body; content:"username="; startswith; content:"&password="; distance:0; http.header_names; content:!"Referer"; content:!"Accept"; reference:md5,f154d5596ecb8f63de1e7319e31ad369; classtype:command-and-control; sid:2030243; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_06_03, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_03, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)