alert smtp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/a310Logger Variant Data Exfil via SMTP"; flow:established,to_server; content:"Subject|3a 20|Files.zip|3a 3a 3a|"; fast_pattern; content:"filename=|22|Files.zip|22 0d 0a 0d 0a|UEs"; distance:0; reference:md5,1f0296b2c958c1208c7fcaff5ce65a15; classtype:trojan-activity; sid:2037207; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_06_29, deployment Perimeter, malware_family a310Logger, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_06_29;)