alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Rofin.A CnC traffic (OUTBOUND)"; flow:established,to_server; dsize:>11; content:"|dd aa 99 66|"; depth:4; byte_jump:4,4,relative,little,from_beginning, post_offset -2; isdataat:!2,relative; reference:md5,6b71398418c7c6b01cf8abb105bc884d; classtype:command-and-control; sid:2020671; rev:4; metadata:created_at 2015_03_11, malware_family Win32_Rofin_A, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_06;)