alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA444 Related CnC Payload Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"-a"; content:"1.msi"; distance:5; within:5; endswith; fast_pattern; pcre:"/-a[0-9]{5}1.msi$/"; reference:url,securelist.com/bluenoroff-methods-bypass-motw/108383/; classtype:trojan-activity; sid:2043157; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_30, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_30;)