alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Valak Variant CnC"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".php?hst="; fast_pattern; http.user_agent; content:"WindowsPowerShell/"; reference:url,unit42.paloaltonetworks.com/cortex-xdr-detects-netsupport-manager-rat-campaign/; reference:md5,dfd424684f3a5c44ff425c7fe425ca8b; classtype:command-and-control; sid:2030853; rev:1; metadata:created_at 2020_09_11, malware_family Win32_Valak, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_11;)