alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [ANY.RUN] Parallax RAT Check-In"; flow:established,to_server; dsize:<300; content:"|22 f1 6e 63|"; startswith; fast_pattern; content:"|b6 26 09|"; distance:1; within:3; reference:md5,c906f5482d2a7d1f0ff3e6f3a945e27c; reference:url,app.any.run/tasks/99728558-769b-4eb3-a839-a7c09a6c7c96; reference:url,twitter.com/James_inthe_box/status/1689027430668025856; classtype:command-and-control; sid:2047156; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2023_08_09, deployment Perimeter, malware_family Parallax, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_08_09; target:src_ip;)