alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/VB.AAF Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/troep/mon/mon.php?n="; startswith; fast_pattern; content:"&u="; distance:0; content:"&v="; distance:0; content:"&a="; distance:0; content:"&i="; distance:0; http.user_agent; content:"Mozilla|2f|4|2e|0|20 28|compatible|3b 20|Win32|3b 20|WinHttp|2e|WinHttpRequest|2e|5|29|"; threshold:type limit, track by_src, seconds 180, count 1; reference:md5,15df8f4bd6fbd26558fe210031d281ec; classtype:trojan-activity; sid:2044368; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_27, deployment Perimeter, malware_family Win32_VB_AAF, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_27;)