alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/VB.QTV CnC Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/mcdata/user.php?fol="; startswith; fast_pattern; content:"&ac="; distance:0; content:"&"; distance:0; http.header_names; content:"|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; startswith; reference:md5,7679f26d0acfd4097d47a43d15a512b8; classtype:command-and-control; sid:2038527; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_08_15, deployment Perimeter, malware_family Win32_VB_QTV, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_15, reviewed_at 2024_12_24;)