alert tcp $HOME_NET any -> $EXTERNAL_NET 1024:65535 (msg:"ET MALWARE Bandook v1.35 Initial Connection and Report"; flow:established,to_server; flowbits:isnotset,BE.Bandook1.35; flowbits:set,BE.Bandook1.35; dsize:<200; content:"|cf 8f 80 9b 9a 9d cf|"; depth:7; content:"|20 26 26 26|"; distance:50; reference:url,www.nuclearwintercrew.com; reference:url,research.sunbelt-software.com/threatdisplay.aspx?name=Bandook&threatid=40408; classtype:command-and-control; sid:2003555; rev:7; metadata:created_at 2010_07_30, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_14;)