alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Linux/MayhemBruter Checkin"; flow:established,to_server; content:"{|0a 20 20 22|id|22 3a 20 22|"; depth:11; fast_pattern; content:"|22 0a|}|00|"; within:36; endswith; reference:url,www.kernelmode.info/forum/viewtopic.php?f=16&t=3405&p=27363; classtype:command-and-control; sid:2022223; rev:3; metadata:created_at 2015_12_07, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_19;)