alert smtp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/a310Logger Clipboard Exfil via SMTP"; flow:established,to_server; content:"Subject|3a 20|Keylogger|3a 3a 3a|"; fast_pattern; content:"[CLIPBOARD]"; distance:0; reference:md5,5f04cfa0c174af13b9825337bfa7691f; classtype:trojan-activity; sid:2033779; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_08_24, deployment Perimeter, malware_family Win32_a310Logger, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_24;)