alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PulsarRAT CnC Traffic Observed"; flow:established,to_server; content:"pulsar.common.messages.other.secure"; fast_pattern; nocase; depth:100; content:"envelope"; nocase; within:20; byte_jump:4,0,little,from_beginning,post_offset 3; isdataat:!2,relative; reference:url,www.pointwild.com/threat-intelligence/when-malware-talks-back; reference:md5,69392e0d2b877cb932ab709ebe758975; classtype:trojan-activity; sid:2067267; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2026_02_03, deployment Perimeter, malware_family PulsarRAT, performance_impact Low, confidence High, signature_severity Major, tag RAT, updated_at 2026_02_03, mitre_tactic_id TA0037, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:src_ip;)