Centos 6.4 how to check if sshd is infected with Fokirtor
At first you need to install
yum install python-psutil
after that
cp /sbin/pidof /bin/pidof
and download and execute this script
https://github.com/kumina/nagios-plugins-kumina/blob/master/check_fokirtor.sh
#!/bin/sh
#
# A simple check to see if running ssh processes contain any string that have
# been designated an indication of Fokirtor by Symantec.
#
# More info here:
# http://www.symantec.com/connect/blogs/linux-back-door-uses-covert-communication-protocol
#
# (c) 2013, Kumina bv, [email protected]
#
# You are free to use, modify and distribute this check in any way you see
# fit. Just don't say you wrote it.
#
# This check is created for Debian Squeeze/Wheezy, no idea if it'll work in
# other distros. You'll need gdb-minimal (for gcore) installed.
# We need to be root
if [ `/usr/bin/id -u` -ne 0 ]; then
echo "You need root for this script. Sorry."
exit 1
fi
# For all pids of the ssh process, do the check
for pid in `/bin/pidof sshd`; do
t=$(/bin/mktemp)
/usr/bin/gdb </dev/null --nx --batch \
-ex "set pagination off" -ex "set height 0 " -ex "set width 0" \
-ex "attach $pid" -ex "gcore $t" -ex detach -ex quit
i=0
for str in hbt= key= dhost= sp= sk= dip=; do
/usr/bin/strings $t | /bin/grep "${str}[[:digit:]]"
if [ $? -eq 0 ]; then
i=$(($i + 1))
fi
done
/bin/rm $t
if [ $i -eq 6 ]; then
echo "CRITICAL: Fokirtor strings found in sshd process ${pid}!"
exit 2
fi
done
echo "OK: No indication of Fokirtor found."
exit 0
After that you will see output like this:
[Thread debugging using libthread_db enabled]
0x00007f5b2e4d7513 in __select_nocancel () from /lib64/libc.so.6
Saved corefile /tmp/tmp.Q89Sku0vPN
[Thread debugging using libthread_db enabled]
0x00007f5b2e4d1630 in __read_nocancel () from /lib64/libc.so.6
Saved corefile /tmp/tmp.QLWtlfoMok
[Thread debugging using libthread_db enabled]
0x00007f5eb920d513 in __select_nocancel () from /lib64/libc.so.6
Saved corefile /tmp/tmp.1d41QbCaA3
[Thread debugging using libthread_db enabled]
0x00007f5eb9207630 in __read_nocancel () from /lib64/libc.so.6
Saved corefile /tmp/tmp.lXIzRAYB4g
[Thread debugging using libthread_db enabled]
0x00007eff8f06c513 in __select_nocancel () from /lib64/libc.so.6
Saved corefile /tmp/tmp.e4QmwlYJtT
OK: No indication of Fokirtor found.