alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Teslarvng Ransomware CnC Activity M1"; flow:established,to_server; content:"sbyc"; startswith; fast_pattern; content:"/000"; distance:20; within:4; content:"JFIF"; distance:0; reference:md5,d26e609c77e314fc3f242a736c323ab6; classtype:command-and-control; sid:2033016; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_05_24, deployment Perimeter, malware_family Ouroboros, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_24, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)