alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed DecryptmyFiles Ransomware User-Agent (uniquesession)"; flow:established,to_server; http.user_agent; content:"uniquesession"; bsize:13; fast_pattern; reference:md5,0e61e496fc218c1c6dc1f5640a3ac7e5; classtype:trojan-activity; sid:2032995; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_05_18, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_18, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)