alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ursnif Variant CnC Data Exfil"; flow:established,to_server; urilen:>125; http.method; content:"POST"; http.uri; pcre:"/\.[a-z]{3,4}$/"; http.request_body; content:"name=|22|upload_file|22 3b 20|filename=|22|"; fast_pattern; content:".bin|22 0d 0a|"; distance:4; within:7; http.header_names; to_lowercase; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,f870c0d62691fc39194922e4a59fdc1c; classtype:command-and-control; sid:2021830; rev:5; metadata:created_at 2015_09_24, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_20;)