Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PS/PSRansom Client Checkin (GET)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/done"; bsize:5; http.user_agent; content:"WindowsPowerShell/"; fast_pattern; http.header_names; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; bsize:34; http.connection; content:"Keep-Alive"; reference:url,github.com/JoelGMSec/PSRansom; classtype:trojan-activity; sid:2042887; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_12_14, deployment Perimeter, deployment SSLDecrypt, malware_family PS_PSRansom, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_12_14, reviewed_at 2025_10_24;)