alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL.L4L Stealer IP Check"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?action=getIP"; fast_pattern; endswith; http.header_names; content:!"User-Agent"; content:!"Referer"; content:!"Accept"; reference:md5,918ffdba1014ec647ae24ddc9de9fde9; classtype:command-and-control; sid:2028929; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_10_31, deployment Perimeter, malware_family MSIL_L4L, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_21;)