alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PSRansom File Exfiltration (POST)"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:41; content:"/files/"; startswith; pcre:"/[a-zA-Z0-9]{34}$/R"; http.user_agent; content:"WindowsPowerShell/"; fast_pattern; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Content-Type|0d 0a|Host|0d 0a|Content-Length|0d 0a|Connection|0d 0a 0d 0a|"; http.request_body; bsize:43; pcre:"/^[a-zA-Z0-9_+]{43}$/"; reference:url,github.com/JoelGMSec/PSRansom; classtype:trojan-activity; sid:2042769; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_13, deployment Perimeter, deployment SSLDecrypt, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_13, reviewed_at 2025_10_24;)