Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE IceRat Backdoor Checkin"; flow:established,to_server; http.request_line; content:"GET /users.php?"; startswith; fast_pattern; pcre:"/^(?:resp|onl|pr)=/R"; content:"|3a|windows|20|"; distance:0; reference:url,www.gdatasoftware.com/blog/icerat-evades-antivirus-by-using-jphp; reference:md5,dae90ae7fe103fc7e1866b4e13389101; classtype:command-and-control; sid:2031486; rev:1; 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 High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_01_06;)