alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/Bobik CnC Traffic"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php?key="; http.user_agent; content:"test-upload"; bsize:11; fast_pattern; http.request_body; content:"lang="; startswith; content:"&image=iVBORw"; distance:0; reference:md5,c110a5814451bbfba9eb41a2b2328213; classtype:command-and-control; sid:2034547; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_11_29, deployment Perimeter, malware_family MSIL_Bobik, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_11_29;)