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Linux.Packed.41

Added to the Dr.Web virus database: 2017-11-16

Virus description added:

Technical Information

To ensure autorun and distribution:
Creates or modifies the following files:
  • /var/spool/cron/crontabs/root
  • /etc/inittab
  • /etc/rc.local
Malicious functions:
Launches itself as a daemon
Modifies router settings:
  • /bin/nvram
Launches processes:
  • sh -c echo \"nameserver 8.8.8.8\" > /etc/resolv.conf &
  • sh -c chmod 700 <SAMPLE_FULL_PATH> > /dev/null 2>&1 &
  • chmod 700 <SAMPLE_FULL_PATH>
  • sh -c touch -acmr /bin/ls <SAMPLE_FULL_PATH>
  • touch -acmr /bin/ls <SAMPLE_FULL_PATH>
  • sh -c (crontab -l | grep -v \"<SAMPLE_FULL_PATH>\" | grep -v \"no cron\" | grep -v \"lesshts/run.sh\" > /var/run/.x00846930886) > /dev/null 2>&1
  • crontab -l
  • grep -v <SAMPLE_FULL_PATH>
  • grep -v no cron
  • grep -v lesshts/run.sh
  • sh -c echo \"* * * * * <SAMPLE_FULL_PATH> > /dev/null 2>&1 &\" >> /var/run/.x00846930886
  • sh -c crontab /var/run/.x00846930886
  • crontab /var/run/.x00846930886
  • sh -c rm -rf /var/run/.x00846930886
  • rm -rf /var/run/.x00846930886
  • sh -c cat /etc/inittab | grep -v \"<SAMPLE_FULL_PATH>\" > /etc/inittab2
  • cat /etc/inittab
  • sh -c echo \"0:2345:respawn:<SAMPLE_FULL_PATH>\" >> /etc/inittab2
  • sh -c cat /etc/inittab2 > /etc/inittab
  • cat /etc/inittab2
  • sh -c rm -rf /etc/inittab2
  • rm -rf /etc/inittab2
  • sh -c touch -acmr /bin/ls /etc/inittab
  • touch -acmr /bin/ls /etc/inittab
  • sh -c /bin/uname -n
  • sh -c nvram get router_name
  • /bin/uname -n
Performs operations with the file system:
Modifies file access rights:
  • <SAMPLE_FULL_PATH>
  • /var/spool/cron/crontabs/tmp.dZvYNg
Creates or modifies files:
  • /etc/resolv.conf
  • /var/run/.x00846930886
  • /run/.x00846930886
  • /var/spool/cron/crontabs/tmp.dZvYNg
  • /etc/inittab2
Deletes files:
  • /var/run/.x00846930886
  • /etc/inittab2
Network activity:
Awaits incoming connections on ports:
  • 127.0.0.1:61008
Connects to the following servers over the IRC protocol:
  • Server: 14#.#4.163.168; Command: NICK x86|0|709557|unknown\nUSER x00 localhost localhost :1.0+tftp_jun112017\n
  • Server: 14#.#4.163.168; Command: PONG :4D1F8E47\n
  • Server: 14#.#4.163.168; Command: MODE x86|0|709557|unknown -xi\n
  • Server: 14#.#4.163.168; Command: MODE x86|0|709557|unknown +B\n
  • Server: 14#.#4.163.168; Command: JOIN #m.x86 :777\n
Other:
Collects OS information

Curing recommendations


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