alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible IceRat CnC Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/dow_"; startswith; fast_pattern; content:".txt"; endswith; http.user_agent; content:"Java/"; startswith; reference:url,www.gdatasoftware.com/blog/icerat-evades-antivirus-by-using-jphp; classtype:trojan-activity; sid:2031485; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_01_06, deployment Perimeter, malware_family IceRAT, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_09;)