alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING HTTP POST Request XOR Key fe"; flow:established,to_server; content:"|ae b1 ad aa de d1|"; startswith; fast_pattern; content:"|de b6 aa aa ae d1|"; distance:0; classtype:misc-activity; sid:2038472; rev:2; metadata:attack_target Client_and_Server, created_at 2022_08_09, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_10, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information;)