alert tcp-pkt $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE TA430/Andariel NukeSped Backdoor Variant Server Response M1"; flow:established,to_client; flowbits:isset,ET.Nukesped; dsize:8; content:"|fd ff 84 3e d8 56 2d 16|"; fast_pattern; reference:md5,bf8c2005409d3d26b2e58c4a7c0c040c; reference:md5,bcac28919fa33704a01d7a9e5e3ddf3f; reference:url,asec.ahnlab.com/en/56405/; classtype:trojan-activity; sid:2051155; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2024_02_28, deployment Perimeter, malware_family TA430, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_02_28; target:dest_ip;)