alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Usteal.B Checkin"; flow:established,to_server; http.uri; content:"/ufr.php"; fast_pattern; http.request_body; content:"name="; content:"filename="; content:"UFR|21|"; reference:md5,3155b146bee46723acc5637617e3703a; reference:url,www.microsoft.com/security/portal/Threat/Encyclopedia/Entry.aspx?Name=TrojanSpy%3AWin32%2FUsteal.B&ThreatID=-2147320862; classtype:command-and-control; sid:2014616; rev:9; metadata:created_at 2011_11_16, deprecation_reason Age, malware_family Win32_Usteal_B, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_11, reviewed_at 2024_01_11;)