alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible MalDoc Retrieving Payload 2021-07-19"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".dat"; endswith; pcre:"/\/(?:[0-9]{2,8}\.)?[0-9]{4,16}\.dat$/s"; http.user_agent; 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)"; bsize:178; fast_pattern; http.header_names; content:!"Referer"; classtype:trojan-activity; sid:2034452; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_07_19, deployment Perimeter, deprecation_reason Age, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_08, reviewed_at 2024_01_08;)