alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MalDoc Retrieving Payload 2021-06-15"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".dat"; endswith; pcre:"/\.[0-9]{6,18}\.dat$/"; http.host; pcre:"/^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$/"; http.user_agent; bsize:178; content:"Mozilla/4.0 (compatible|3b 20|MSIE 7.0|3b 20|Windows NT 6.1|3b 20|WOW64|3b 20|Trident/7.0|3b 20|SLCC2|3b 20|.NET CLR 2.0.50727|3b 20|.NET CLR 3.5.30729|3b 20|.NET CLR 3.0.30729|3b 20|Media Center PC 6.0|3b 20|.NET4.0C|3b 20|.NET4.0E)"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|referer|0d 0a|"; classtype:trojan-activity; sid:2034460; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_06_15, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_30;)