mal-dnssearch

Mal-dnssearch is a robust shell script that compares IP and DNS
addresses in logs against malware (and related) reputation data.
It reports any matches and supports many log formats.

Requires Bash version 4.2+. Tested with Bash on OpenBSD, FreeBSD, OSX, and Ubuntu.

Installation:

Edit the Makefile or use the defaults to install the script.
The default is to install to /usr/local/mal-dnssearch. A symlink is then created in /usr/bin so that mal-dnssearch will most likely be in your PATH.

To install use:

sudo make install

To uninstall use:

sudo make uninstall

Supported Logs (parses DNS names only):

Specify log type with -T <type>. This is used to parse the file correctly.
-f is then required to specify the log file to read.

Type:	Description:
apache	Apache Access Log
apachev	Apache Other Vhosts Access Log
argus	ARGUS file (requires user data i.e. setting ARGUS_CAPTURE_DATA_LEN)
bind	ISC's BIND query log file
bro	BRO-IDS dns.log file
custom	ip - Custom file - IP addresses, one per line.
custom	dns - Custom file - DNS (with one DNS name per line w/o trailing FQDN dot)
hosts	/etc/hosts file
httpry	HttPry log file
passivedns	PassiveDNS log file
tcpdump	Tcpdump pcap file
tshark	Tshark pcap file
sonicwall	SonicWall NSA log file (via syslog)

Is your log not supported? E-mail me a sample, I'll add it.

Supported Malware Host Lists:

Default is http://secure.mayhemiclabs.com/malhosts/malhosts.txt (DNS list) when -M is not specified.

List:	Description:
custom	Custom, one IP entry per line
snort	http://labs.snort.org/feeds/ip-filter.blf (IP)
et_ips	http://rules.emergingthreats.net/open/suricata/rules/compromised-ips.txt (IP)
alienvault	http://reputation.alienvault.com/reputation.generic (BIG file) (IP)
botcc	http://rules.emergingthreats.net/open/suricata/rules/botcc.rules (IP)
tor	http://rules.emergingthreats.net/open/suricata/rules/tor.rules (IP)
rbn	http://rules.emergingthreats.net/blockrules/emerging-rbn.rules (IP)
malhosts	http://www.malwaredomainlist.com/hostslist/hosts.txt (DNS)
malips	http://www.malwaredomainlist.com/hostslist/ip.txt (IP)
ciarmy	http://www.ciarmy.com/list/ci-badguys.txt (IP)
mayhemic	http://secure.mayhemiclabs.com/malhosts/malhosts.txt (DNS)
mandiant	https://raw.github.com/jonschipp/mal-dnssearch/master/mandiant_apt1.dns (DNS)

Todo (not ranked):

• More efficient parsing
• Add support for more logs (e-mail me with request and log sample)
• Check for necessary programs where needed e.g. bro-cut, ra, tcpdump, tshark
• Option to edit/change URLs in the script
• Add cron mode option
• Rewrite script in Python or C
• Add option to download list only
• See if you can read from the Collective Intelligence Framework database
• Try optimizing with Gnu Parallel
• See if there's a Team Cymru list to match against.
• Add option to combine all IP and DNS lists into a single IP or DNS list. e.g. --all [dns|ip]
• Add lists: * http://www.dragonresearchgroup.org/insight/
  • http://danger.rulez.sk/projects/bruteforceblocker/blist.php
  • http://www.openbl.org/lists/date_all.txt
  • http://www.mirc.com/servers.ini
  • https://reputation.alienvault.com/reputation.data
• Read from exported Sguil event logs
• Add apache logs
• Fix "0 out of 0 entries matched" on second run bug
• Add whitelist option to mal-dns2bro

Usage:

Non-mandatory options:

-w accept file with one entry per line or grep regex e.g. -w "dont|match|these", -w whitelist.txt
-l Log stdout & stderr to file e.g. -l /var/log/output.log
-F block matched hosts w/ firewall, 3 available: iptables, pf, ipfw e.g. -F pf
-N skip file download
-p Pass downloaded file to stdout to pipe to other programs e.g.
-M mayhemic -p | mal-dns2bro -T dns > mayhemic.intel
-v Print line from mal-host list as its processed for debugging
-V Print each line from the log file as its processed for debugging

Usage: ./mal-dnssearch -T <type> -f <logfile> [-M <list>] [-w whitelist] [-l out.log] [-F firewall] [-N] [-vV]

Examples:

./mal-dnssearch.sh -M mandiant (Downloads file only)
./mal-dnssearch.sh -T tshark -f dns.pcap
./mal-dnssearch.sh -T passivedns -f /var/log/passivedns/dmz.log -w whitelist.txt
./mal-dnssearch.sh -T bro -f /usr/local/bro/logs/current/dns.log \
	-w "company.com|abc.com|google|facebook" -l dns.results.log
./mal-dnssearch.sh -T bro -f /usr/local/bro/logs/current/dns.log -F iptables -l dns.results.log
./mal-dnssearch.sh -T argus -f dns.argus -M malhosts -F iptables -l dns.results.log
./mal-dnssearch.sh -T custom-ip -f iplist.log -M snort -l ip.results.log -N -v
./mal-dnssearch.sh -T custom-ip -f iplist.log -M mandiant -l ip.results.log
./mal-dnssearch.sh -T apache -f /var/log/apache2/access.log

Author:

Jon Schipp (keisterstash)
More info
jonschipp [ at ] Gmail dot com
sickbits.net, jonschipp.com