Rule History

alert smtp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Tofsee Unique Email Body Byte Sequence Observed"; flow:to_server,established; content:"|0d 0a 0d 0a 3d 32 30 0d 0a 0d 0a 0d 0a 0d 0a 0d 0a 0d 0a 53 0d 0a|"; fast_pattern; threshold:type threshold, count 5, seconds 120, track by_src; classtype:command-and-control; sid:2029775; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, created_at 2020_03_31, malware_family Tofsee, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_03_31;)