alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE JS/Ostap Maldoc Check-in"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?g="; content:"&k="; distance:0; content:"&x="; distance:0; content:"@@"; distance:0; content:"@@"; distance:0; content:"@@*"; fast_pattern; distance:0; http.header_names; content:!"Referer|0d 0a|"; reference:md5,c53393908f80e993366deec605fe7372; classtype:trojan-activity; sid:2029539; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_26, deployment Perimeter, malware_family JS_Ostap, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_02_26;)