alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sality - Fake Opera User-Agent"; flow:established,to_server; http.method; content:"GET"; http.user_agent; content:"Opera/8.81 (Windows NT 6.0|3b 20|U|3b 20|en)"; depth:34; endswith; reference:url,www.spywareremove.com/removeTrojanDownloaderSalityG.html; reference:url,www.microsoft.com/security/portal/beta/Threat/Encyclopedia/Entry.aspx?Name=Virus%3AWin32%2FSality.AM; classtype:trojan-activity; sid:2009525; rev:9; metadata:created_at 2010_07_30, confidence High, signature_severity Major, updated_at 2020_10_19;)