alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE BACKCONFIG CnC Downloader Activity"; flow:established,to_server; http.uri; content:"/request/httpsrequest"; bsize:21; fast_pattern; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.header; content:!"Referer"; reference:url,unit42.paloaltonetworks.com/updated-backconfig-malware-targeting-government-and-military-organizations; classtype:trojan-activity; sid:2030165; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_05_13, deployment Perimeter, malware_family APT_HANGOVER, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_13;)