#!/usr/bin/perl
use strict;
use warnings;
use Data::Dump 'pp';

my %hash  = ();
my $level = 0; 
my $key; 
while (<DATA>){
  next unless /\S/;
  my ($proc,$data) = split ':\s+',$_,2;
  if ($level == 0){
    $key = $proc;
  } else {
    push @{$hash{$key}},$data if (defined $data);    
  } 
  ++$level if /{/;
  --$level if /}/;
}
pp \%hash;

__DATA__
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx: UDT{
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line2: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line3: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line4: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line5: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:    	      line6: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Rx:		      line7: data
}
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Tx: UDT{
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Tx:		      line10: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Tx:		      line11: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Tx:		      line12: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Tx:		      line13: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Tx:    	      line14: data
[     11] 25/2/2017-19:02:06.980 proces_name thanos-Tx:		      line15: data
}