alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/STEALBIT Data Exfiltration Tool Activity (PUT)"; flow:established,to_server; http.uri; pcre:"/^\/[A-F0-9]{33}$/"; http.method; content:"PUT"; http.request_body; content:"DAV2"; depth:10; fast_pattern; http.header_names; content:!"Referer|0d 0a|"; reference:url,yoroi.company/research/hunting-the-lockbit-gangs-exfiltration-infrastructures/; reference:url,www.cybereason.com/blog/research/threat-analysis-report-inside-the-lockbit-arsenal-the-stealbit-exfiltration-tool; classtype:trojan-activity; sid:2036280; rev:2; metadata:attack_target Client_Endpoint, created_at 2022_04_20, deployment Perimeter, malware_family Win32_STEALBIT, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_30;)