alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Parallax CnC Activity M18 (set)"; flow:established,to_server; content:"|a2 b7 1e a8|"; startswith; fast_pattern; content:"|c7 ba d0|"; distance:1; within:3; flowbits:set,ET.Parallax-18; flowbits:noalert; reference:md5,40256ea622aa1d0678f5bde48b9aa0fb; reference:url,www.uptycs.com/blog/cryptocurrency-entities-at-risk-threat-actor-uses-parallax-rat-for-infiltration; classtype:command-and-control; sid:2044449; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_03_06, deployment Perimeter, former_category MALWARE, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_30, reviewed_at 2024_09_30;)