alert tcp $HOME_NET any -> $EXTERNAL_NET 25 (msg:"ET MALWARE MiniDuke CnC Beacon (string2_slide_2_2)"; flow:established,to_server; content:"A"; content:"z"; within:3; content:"N"; within:3; content:"G"; within:3; content:"Z"; within:3; content:"a"; within:3; content:"N0VbcF"; within:8; reference:url,www.us-cert.gov/security-publications/GRIZZLY-STEPPE-Russian-Malicious-Cyber-Activity; classtype:targeted-activity; sid:2023927; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_02_16, deployment Perimeter, malware_family APT29_MiniDuke, confidence High, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)