Hello Risto
I’ve been running tests on SEC for a while and stuck with below points. I’m
not familiar with Perl though I tried to find a solution from sec mail
bucket but no luck, please suggest if this can be achieved with high
performance,
1. I could see a log drops when I tested with the event rate of 15000
logs/sec. A simple SEC rule to receive and forward all the logs to a
destination. The output shows relatively less number of logs. This also
increases the cpu usage from 0.3% to 45%
************************
Type=single
Ptype=regexp
Pattern=([.\d]+)
Desc=$1
Action=pipe $0 nc syslog101 514
************************
1. On a different scenario, I was interested to match the logs with list
of IOC’s. Here i was trying to mail the detected log along with IOC name. I
could achieve it to certain level as mentioned in example but no luck with
this cases, "Split IP's from the IOC file and use it on the “pattern” to
match IP from logs"
************************
IOC_data_proposal.txt
187.163.222.244:465 - emotet
187.189.195.208:8443 - emotet
188.166.253.46:8080 - emotet
189.209.217.49:80 - heartbleed
************************
Please check and share some insights.
Eg: I currently tested below case and its working fine as this is a
straight forward IOC matches.
************************
#Current Rule for matching IOC:
type=Single
ptype=RegExp
pattern=(?:SEC_STARTUP|SEC_RESTART|SEC_SOFTRESTART)
desc=load IOC data
action=logonly; delete IP; create IP; \
lcall %iocevents -> (sub{scalar `cat
/usr/local/bin/sec-rules/ioc_data.txt`});
\
cevent IOC_IP 0 %iocevents;
type=Single
ptype=RegExp
pattern=.
context=IOC_IP
desc=create an entry
action=logonly; alias IOC IOC_$0
type=Single
ptype=regexp
context=IOC_$2
pattern= syslog.*hostname=([\w\-\d]+).*IP=([\d\.]+)
desc=Matched host & ip: $2 && $3
action=pipe '$0' mail -s ‘%s’ ‘test123.gmail.com’
IOC_data.txt
187.163.222.244
187.189.195.208
188.166.253.46
189.209.217.49
187.163.222.244
187.189.195.208
188.166.253.46
189.209.217.49
************************
Regards,
san
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