alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE VBS/Kimsuky UA Observed"; flow:established,to_server; http.user_agent; content:"Mozilla|2f|5|2e|0|20 28|Windows|20|NT|20|10|2e|0|3b 20|Win64|3b 20|x64|29 20|AppleWebKit|2f|537|2e|36|20 28|KHTML|2c 20|like|20|Gecko|29 20|Chnome|2f|97|2e|0|2e|4692|2e|99|20|Safari|2f|537|2e|36"; bsize:114; fast_pattern; reference:md5,a871511ef8abae9f103a3dfe77b12b6d; reference:url,securelist.com/kimsukys-golddragon-cluster-and-its-c2-operations/107258/; classtype:trojan-activity; sid:2038675; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_08_30, deployment Perimeter, malware_family VBS_Kimsuky, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_10, reviewed_at 2025_10_24;)