alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE DesckVB RAT RunBlugin Response from CnC"; flow:established,to_client; flowbits:isset,ET.DesckVB.Checkin; content:"RunBlugin|7c 7c|"; startswith; fast_pattern; pcre:"/(?:[A-Z0-9+\x2f]{4})*(?:[A-Z0-9+\x2f]{2}==|[A-Z0-9+\x2f]{3}=|[A-Z0-9+\x2f]{4})/R"; reference:url,github.com/ShadowOpCode/DesckVB-RAT/tree/main; reference:md5,8f2f2b1a5666036ef7be2cd4d42eb281; classtype:trojan-activity; sid:2067336; 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_05, deployment Perimeter, malware_family DesckVB_Rat, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_02_05, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel; target:dest_ip;)