alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Oliga Fake User Agent"; flow:established,to_server; http.user_agent; content:"Mozilla/4.75 [en]"; depth:17; content:!"Linux"; classtype:trojan-activity; sid:2013372; rev:6; metadata:created_at 2011_08_05, malware_family Win32_Oliga, confidence High, signature_severity Major, updated_at 2020_08_18;)