alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Likely Hex Encoded Executable as String - Percent Separated"; flow:established,to_client; file.data; content:"4D|25|5A|25|"; nocase; content:"|25|50|25|45|25|00|25|00|25|"; distance:0; content:"|25|21|25|54|25|68|25|69|25|73|25|20|25|70|25|72|25|6f|25|67|25|72|25|61|25|6d|25|"; distance:0; nocase; fast_pattern; reference:url,threatmon.io/apt-sidecopy-targeting-indian-government-entities/; classtype:bad-unknown; sid:2044373; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_02_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_28, mitre_tactic_id TA0005, mitre_tactic_name Defense_Evasion, mitre_technique_id T1027, mitre_technique_name Obfuscated_Files_or_Information; target:dest_ip;)