alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32.Dreambot File Upload (No Data Sent)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/images/"; content:"_2"; pcre:"/\/images\/.*_2[FB].*\.(?:avi|gif|bmp|jpeg|png)$/i"; http.header; content:"Content-Length|3a 20|2|0d 0a|"; fast_pattern; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:!"|0d 0a|Accept"; content:"|0d 0a|User-Agent|0d 0a|"; startswith; reference:md5,e17b1d84da1d2c684f3e67adff7ef582; classtype:trojan-activity; sid:2022970; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_07_14, deployment Perimeter, malware_family ursnif, malware_family Dreambot, malware_family ISFB, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_03_10;)