alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Various Malicious AlphaNum DL Feb 10 2016"; flow:established,to_server; urilen:15<>50; http.uri; content:!"="; content:!"&"; content:!"?"; pcre:"/\/(?=[a-z]{0,7}[0-9])(?=[0-9]{0,7}[a-z])[a-z0-9]{7,8}\/(?=[a-z]{0,7}[0-9])(?=[0-9]{0,7}[a-z])[a-z0-9]{7,8}$/"; http.user_agent; content:"MSIE 7.0|3b 20|Windows NT"; fast_pattern; http.header_names; to_lowercase; content:!"cookie|0d 0a|"; content:!"|0d 0a|referer|0d 0a|"; classtype:trojan-activity; sid:2022503; rev:6; metadata:created_at 2016_02_11, performance_impact Significant, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_21;)