alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible APT Sarhurst/Husar/Hussarini/Hassar CnC GET"; flow:established,to_server; urilen:>40; http.method; content:"GET"; http.uri; content:"/?"; startswith; content:"AAAAAAAAAA"; distance:0; pcre:"/^\/\?(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/"; http.header; strip_pseudo_headers; header_lowercase; content:"accept|3a 20|Accept|3a 2a 2f 2a 0d 0a|"; startswith; fast_pattern; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|MSIE 5.5|3b 20|Windows NT 5.0)"; startswith; endswith; reference:url,www.fortinet.com/blog/threat-research/hussarini---targeted-cyber-attack-in-the-philippines.html; classtype:targeted-activity; sid:2027710; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_07_15, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_02;)