alert http1 $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible Graftor Downloading Dridex"; flow:established,to_server; http.uri; content:".exe"; fast_pattern; endswith; http.user_agent; content:"MSIE"; http.connection; content:"close"; bsize:5; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|Host|0d 0a|Accept-Language|0d 0a|Accept|0d 0a|Accept-Encoding|0d 0a|Connection|0d 0a|User-Agent|0d 0a 0d 0a|"; reference:md5,5d9d5b9089ad464e51ff391b14da1953; classtype:trojan-activity; sid:2020960; rev:6; metadata:created_at 2015_04_22, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_07;)