alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO SAFIB Assistant Remote Administration Tool Keepalive"; flow:established,to_server; dsize:92; content:"|02 32 00 00 5c 00 00 00|"; startswith; content:"|00 00 00 00 01 00 00 00 91 55 50 01|"; distance:48; fast_pattern; content:"|00 00 00 00 00 00 00 00 00 00 00 00|"; endswith; threshold:type limit,track by_src,seconds 180,count 1; classtype:misc-activity; sid:2038601; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_08_23, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_23;)