Thanks choroba ! You hit the spot in the sense of performance and simplicity, The speed of XS is just wow never new about that, Sorry for the BitTorrent thing I paste a wrong packet yes indeed it was an SSL.Google and the First part of the Hex 19:68:09:24:00 is just a magic and full hex is always fixed 24 pair,but output should be better below is your code in action:

#!/bin/dash
perl -MText::CSV_XS=csv -we 'csv( in           => *ARGV,
                                    sep_char     => ";",
                                    always_quote => 1,
                                    after_parse  => sub {
                                        $_[1][-1] = join "", map chr h
+ex, split /:/, $_[1][-1]
                                    }
                               )'
[download]

INPUT

 
"Feb  2, 2018 18:06:49.993349000 ";"172.16.16.75";"26504";"31.13.86.8"
+;"443";"19:68:09:24:00:5b:00:77:53:53:4c:2e:46:61:63:65:62:6f:6f:6b:0
+0:00:00:00"
"Feb  2, 2018 18:06:49.993467000 ";"172.16.13.158";"28802";"151.101.11
+2.102";"443";"19:68:09:24:00:5b:00:76:53:53:4c:2e:53:6c:61:63:6b:00:0
+0:00:00:00:00:00"
"Feb  2, 2018 18:06:49.996467000 ";"192.167.170.118";"48620";"216.58.2
+10.206";"443";"19:68:09:24:00:bc:00:7c:51:55:49:43:2e:59:6f:75:54:75:
+62:65:00:00:00:00"
"Feb  2, 2018 18:06:49.997690000 ";"172.16.15.155";"33318";"172.217.18
+.46";"443";"19:68:09:24:00:5b:00:e4:53:53:4c:2e:50:6c:61:79:53:74:6f:
+72:65:00:00:00"
"Feb  2, 2018 18:06:49.998318000 ";"172.16.23.85";"26617";"31.13.86.51
+";"443";"19:68:09:24:00:5b:00:8e:53:53:4c:2e:57:68:61:74:73:41:70:70:
+00:00:00:00"
"Feb  2, 2018 18:06:49.998889000 ";"172.16.16.75";"26497";"172.217.18.
+42";"443";"19:68:09:24:00:5b:00:ef:53:53:4c:2e:47:6f:6f:67:6c:65:53:6
+5:72:76:69:00"
"Feb  2, 2018 18:06:49.999517000 ";"172.16.14.116";"27917";"216.58.209
+.36";"443";"19:68:09:24:00:5b:00:7e:53:53:4c:2e:47:6f:6f:67:6c:65:00:
+00:00:00:00:00"
"Feb  2, 2018 18:06:50.001838000 ";"172.16.14.163";"26396";"172.217.18
+.42";"443";"19:68:09:24:00:5b:00:ef:53:53:4c:2e:47:6f:6f:67:6c:65:53:
+65:72:76:69:00"
"Feb  2, 2018 18:06:50.002442000 ";"192.167.175.103";"1169";"107.154.5
+0.239";"21120";"19:68:09:24:00:00:00:00:55:6e:6b:6e:6f:77:6e:00:00:00
+:00:00:00:00:00:00"
[download]

OUTPUT

"Feb  2, 2018 18:06:49.993349000 ";"172.16.16.75";"26504";"31.13.86.8"
+;"443";"h    $"0["0wSSL.Facebook"0"0"0"0"
"Feb  2, 2018 18:06:49.993467000 ";"172.16.13.158";"28802";"151.101.11
+2.102";"443";"h    $"0["0vSSL.Slack"0"0"0"0"0"0"0"
"Feb  2, 2018 18:06:49.996467000 ";"192.167.170.118";"48620";"216.58.2
+10.206";"443";"h    $"0�"0|QUIC.YouTube"0"0"0"0"
"Feb  2, 2018 18:06:49.997690000 ";"172.16.15.155";"33318";"172.217.18
+.46";"443";"h    $"0["0�SSL.PlayStore"0"0"0"
"Feb  2, 2018 18:06:49.998318000 ";"172.16.23.85";"26617";"31.13.86.51
+";"443";"h    $"0["0SL.WhatsApp"0"0"0"0"
"Feb  2, 2018 18:06:49.998889000 ";"172.16.16.75";"26497";"172.217.18.
+42";"443";"h    $"0["0�SSL.GoogleServi"0"
"Feb  2, 2018 18:06:49.999517000 ";"172.16.14.116";"27917";"216.58.209
+.36";"443";"h    $"0["0~SSL.Google"0"0"0"0"0"0"
"Feb  2, 2018 18:06:50.001838000 ";"172.16.14.163";"26396";"172.217.18
+.42";"443";"h    $"0["0�SSL.GoogleServi"0"
"Feb  2, 2018 18:06:50.002442000 ";"192.167.175.103";"1169";"107.154.5
+0.239";"21120";"h    $"0"0"0"0Unknown"0"0"0"0"0"0"0"0"0"
[download]