Rule History

alert dns $HOME_NET any -> any any (msg:"ET MALWARE Shifr Ransomware CnC DNS Query (v5t5z6a55ksmt3oh)"; dns.query; content:".v5t5z6a55ksmt3oh"; fast_pattern; endswith; nocase; reference:md5,7a8c9fbfad9a817c0a10fed926f134c2; classtype:command-and-control; sid:2024491; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_07_25, deployment Perimeter, malware_family Shifr, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)