alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Gatak.DR Activity"; flow:established,to_server; http.method; content:"POST"; http.uri; pcre:"/^\/([a-z]{4,9}\/[a-z]{4,12}\?[a-z]{4,7}\=[0-9]{5,7})$/"; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 8.0|3b 20|Windows NT 5.1|3b 20|Trident/4.0)"; fast_pattern; http.header_names; to_lowercase; content:!"|0d 0a|accept"; content:!"|0d 0a|referer|0d 0a|"; reference:md5,adb3242f8efad48ca174a7e46991f507; classtype:trojan-activity; sid:2021246; rev:5; metadata:created_at 2015_06_11, malware_family Win32_Gatak_DR, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_20;)