alert tcp $HOME_NET any -> $EXTERNAL_NET [25,587] (msg:"ET MALWARE SpamBanker message"; flow:established,to_server; content:"NEGOCIO_ONLINE|2e|"; fast_pattern; nocase; content:"|0d 0a|Content-Disposition|3a 20|attachment"; content:"filename|3d|"; nocase; distance:0; pcre:"/^[\x22\x27]NEGOCIO_ONLINE(\.(?:zip|exe))[\x27\x22]\x0d\x0a/Ri"; reference:url,tools.cisco.com/security/center/viewThreatOutbreakAlert.x?alertId=36677; classtype:trojan-activity; sid:2019937; rev:5; metadata:created_at 2014_12_15, signature_severity Major, updated_at 2024_03_06;)