Created
June 29, 2014 02:23
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DNS Anomaly Detection
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| #!/bin/bash | |
| export PATH=/opt/bro/bin:$PATH | |
| BRO_LOGS="/nsm/bro/logs" | |
| TODAY=`date +%Y-%m-%d` | |
| YESTERDAY=`date -d yesterday +%Y-%m-%d` | |
| OLD_DIRS=`ls $BRO_LOGS |egrep -v "current|stats|$TODAY|$YESTERDAY"` | |
| TMPDIR=/tmp | |
| OLDLOG=$TMPDIR/oldlog | |
| NEWLOG=$TMPDIR/newlog | |
| SUSPECTS=$TMPDIR/suspects | |
| for DIR in $OLD_DIRS; do zcat $BRO_LOGS/$DIR/dns* |bro-cut query; done | sort | uniq -c | sort -k2 > $OLDLOG | |
| zcat $BRO_LOGS/$YESTERDAY/dns* |bro-cut query | sort | uniq -c | sort -k2 > $NEWLOG | |
| join -1 2 -2 2 -a 2 $OLDLOG $NEWLOG | egrep -v '.* [0-9]+ [0-9]+$' | sort -nr -k2 | head -10 > $SUSPECTS |
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