alert tcp $HOME_NET any -> $EXTERNAL_NET 1714 (msg:"ET MALWARE Qarallax RAT Keepalive C2 (set)"; flow:established,to_server; flowbits:set,ET.qarallax; flowbits:noalert; content:"|00 00 09 00 00 00 00 00 00 00|"; depth:10; threshold:type both, track by_src, count 5, seconds 30; reference:md5,cf178c55c0572d8fea89137c62afdc98; reference:url,labsblog.f-secure.com/2016/06/07/qarallax-rat-spying-on-us-visa-applicants/; classtype:command-and-control; sid:2022882; rev:3; metadata:created_at 2016_06_08, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_14;)