Tente isto:
$ awk 'FNR==NR{a[$2$3$5];next} ($5$4$(NF-1)) in a' file1 file2
1 Jul 28 04:15 2014-07-28 id920767(group2)[attribute3 attribute4 .... attribute n] Tunneling: User with IP 10.111.8.25 connected
1 Jul 28 04:16 2014-07-28 ID926072(group3)[attribute1 attribute2] Tunneling:User with IP 10.111.8.12 connected