alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE [PTsecurity] WeChat (Ransomware/Stealer) Config"; flow:established,to_client; content:"200"; http_stat_code; file_data; content:"md5"; depth:3; fast_pattern; content:"nnnn"; distance:12; within:4; content:"z"; distance:28; within:1; content:"z"; distance:32; within:1; content:"z"; distance:35; within:1; reference:url,thehackernews.com/2018/12/china-ransomware-wechat.html; classtype:trojan-activity; sid:2026687; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_12_05, deployment Perimeter, malware_family Ransomware, malware_family Stealer, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)