alert tcp $HOME_NET any -> $EXTERNAL_NET [587,25] (msg:"ET MALWARE UNK_MonkeyWrench Exfil via SMTP"; flow:established,to_server; content:"Subject|3a 20|AnyDesk|20|"; fast_pattern; content:"filename|3d 22|AnyDesk|2e|rar|22|"; reference:md5,664a7f2d21f20f4a9747981145cb1332; classtype:trojan-activity; sid:2068527; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_04_01, deployment Perimeter, confidence High, signature_severity Critical, tag c2, tag Description_Generated_By_Proofpoint_Nexus, tag UNK_MonkeyWrench, updated_at 2026_04_01, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:src_ip;)