alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Small.NQT!tr CnC Activity"; flow:established,to_server; content:"|49 4d 49 4e 20|"; startswith; fast_pattern; content:"|40|"; distance:0; content:"|0a|"; endswith; reference:md5,07d0d60fbcf30f7ab7861ad9981a2eed; classtype:command-and-control; sid:2034931; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_01_18, deployment Perimeter, malware_family Win32_Small_NQT_tr, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_01_18;)