alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Lazarus Downloader (JEUSD) CnC Beacon"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|upload|22 3b 20|filename=|22|temp.gif|22 0d 0a|"; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; reference:url,blogs.360.cn/blog/apt-c-26/; reference:md5,5509ee41b79c5d82e96038993f0bf3fa; reference:url,us-cert.cisa.gov/ncas/analysis-reports/ar21-048a; classtype:command-and-control; sid:2025991; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_08_15, deployment Perimeter, malware_family JEUSD, confidence High, signature_severity Major, tag Lazarus, tag c2, updated_at 2020_08_25, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)