Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win/Ghostlocker Ransomware Activity M1 (POST)"; flow:established,to_server; urilen:18; http.method; content:"POST"; http.uri; content:"/incrementLaunches"; fast_pattern; http.user_agent; content:"python-requests/"; startswith; http.accept_enc; content:"|20|zstd"; http.request_body; content:"|7b 22 75 73 65 72 6e 61 6d 65 22 3a 20 22 47 68 6f 73 74 22 7d|"; bsize:21; http.header_names; content:!"Referer"; reference:md5,dfb5e2963e9bc48c904f4ac5978fe9ea; reference:url,www.rapid7.com/blog/post/2023/11/08/ghostlocker-a-work-in-progress-raas/; classtype:trojan-activity; sid:2050993; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_02_21, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_21; target:src_ip;)