alert udp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PowerShell/Agent.A DNS Checkin"; content:"|01|"; offset:2; depth:1; content:"|00 01 00 00 00 00 00|"; distance:1; within:7; content:"00"; distance:1; within:2; content:"00000"; distance:0; fast_pattern; pcre:"/^(?!0+30)[0-9A-Z]+30[^0-9]/R"; content:"|00|"; distance:0; reference:url,www.fireeye.com/blog/threat-research/2016/05/targeted_attacksaga.html; classtype:command-and-control; sid:2022836; rev:4; metadata:created_at 2016_05_24, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_08_29;)