alert tcp $HOME_NET any -> $HOME_NET [445,139] (msg:"ET MALWARE Zlader Ransomware Worm Propagating Over SMB v1 ASCII"; flow:to_server,established; content:"|FF|SMB|A2|"; offset:4; depth:5; byte_test:1,!&,0x80,6,relative; content:"|24|RECYCLE|2E|BIN|2E 7B|"; nocase; distance:0; fast_pattern; pcre:"/\x24RECYCLE\.BIN\.\x7B[0-9A-F]{8}\x2D(?:[0-9A-F]{4}\x2D){3}[0-9A-F]{12}\x7D\x5C\x7B[0-9A-F]{8}\x2D(?:[0-9A-F]{4}\x2D){3}[0-9A-F]{12}\x7D\.(?:scr|pif|cmd)/i"; threshold:type limit, track by_src, count 10, seconds 60; reference:url,www.trendmicro.com/vinfo/us/threat-encyclopedia/malware/worm_zlader.b; classtype:trojan-activity; sid:2023149; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_09_01, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, updated_at 2019_07_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)