alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32.Agent.OSCF CnC Checkin"; flow:established,to_server; content:"IP|3d|"; content:"IP|3d|"; distance:0; content:"|3d|Microsoft|20|Windows|20|"; fast_pattern; distance:0; content:"|3d|C|3a 5c|"; distance:0; byte_jump:4,0,little,from_beginning; content:"|0d 0a 0d 0a|"; endswith; reference:md5,38fdb5c2bf21500a888fa9b0d9649a19; classtype:trojan-activity; sid:2039607; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_10_31, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_10_31;)