Rule History

alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Subterranean Crimson Rat - GetInfo Command"; flow:established,to_client; content:"crimson.universal.containers.Message"; content:"CLIENT_getInfo"; nocase; fast_pattern; content:"|00|"; within:4; pcre:"/^.\d{1,2}\.\d+\.\d+/R"; reference:url,twitter.com/James_inthe_box/status/1488987814066753538; classtype:trojan-activity; sid:2035069; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_02_03, deployment Perimeter, malware_family Subterranean_Crimson, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_02_03;)