alert smtp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/JobCrypter Ransomware Checkin via SMTP"; flow:to_server,established; content:"|0d 0a 0d 0a|jui=0D=0A=0D=0Atre|3a 20|"; fast_pattern; content:"|0d 0a 0d 0a 2e 0d 0a|"; distance:0; isdataat:!1,relative; reference:md5,3bb560cb690a91134508910178928973; classtype:trojan-activity; sid:2030672; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_08_11, deployment Perimeter, deprecation_reason Age, malware_family JobCrypter, confidence Medium, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_05_06, reviewed_at 2024_05_06, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)