alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kimsuky CSPY Downloader Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"dwn.php?van="; fast_pattern; pcre:"/^\d+$/R"; http.header_names; content:"|0d 0a|Accept|0d 0a|Host|0d 0a|Accept-Encoding|0d 0a|Accept-Language|0d 0a|User-Agent|0d 0a|"; startswith; reference:url,www.cybereason.com/blog/back-to-the-future-inside-the-kimsuky-kgh-spyware-suite; classtype:targeted-activity; sid:2031171; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_11_03, deployment Perimeter, malware_family KGH_Malware_Suite, confidence High, signature_severity Major, tag Kimsuky, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_03;)