alert tcp-pkt $HOME_NET any -> any any (msg:"ET MALWARE Pay2Key Ransomware - Sending RSA Key"; flow:established,to_server; dsize:286; content:"|10 10 00 00 00 00 14 01 00 00 06 02 00 00 00 a4 00 00 52 53 41 31 00 08 00 00 01 00 01 00|"; startswith; reference:url,research.checkpoint.com/2020/ransomware-alert-pay2key/; classtype:command-and-control; sid:2031192; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_11_09, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_09, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)