alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Miniduke Variant CnC Beacon via WebDAV"; flow:established,to_server; http.uri; content:"/catalog/outgoing"; fast_pattern; http.user_agent; content:"Microsoft-WebDAV-MiniRedir/"; startswith; reference:md5,f3459924f8b657359cb0bd0984a1d0fa; reference:url,www.us-cert.gov/security-publications/GRIZZLY-STEPPE-Russian-Malicious-Cyber-Activity; classtype:targeted-activity; sid:2023930; rev:4; 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 2020_10_08, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)