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Linux.BackDoor.Tsunami.885

Added to the Dr.Web virus database: 2018-04-27

Virus description added:

Technical Information

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 &
  • sh -c touch -acmr /bin/ls <SAMPLE_FULL_PATH>
  • chmod 700 <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/.x001804289383) > /dev/null 2>&1
  • grep -v <SAMPLE_FULL_PATH>
  • grep -v no cron
  • grep -v lesshts/run.sh
  • crontab -l
  • sh -c echo \"* * * * * <SAMPLE_FULL_PATH> > /dev/null 2>&1 &\" >> /var/run/.x001804289383
  • sh -c crontab /var/run/.x001804289383
  • crontab /var/run/.x001804289383
  • sh -c rm -rf /var/run/.x001804289383
  • rm -rf /var/run/.x001804289383
  • 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.LC4UgF
Creates or modifies files:
  • /tmp/.udevd25.pid
  • /etc/resolv.conf
  • /var/run/.x001804289383
  • /run/.x001804289383
  • /var/spool/cron"/crontabs/tmp.LC4UgF
  • /var/spool/cron/crontabs/tmp.LC4UgF
Deletes files:
  • /var/run/.x001804289383"
Network activity:
Connects to the following servers over the IRC protocol:
  • Server: 15#.#9.60.149; Command: NICK x86|x|0|337844|unknown\nUSER x00 localhost localhost :sept15201s10_daem_bp\n
  • Server: 15#.#9.60.149; Command: PONG :A9452548\n
  • Server: 15#.#9.60.149; Command: NICK x86|x|0|337844|unknown\n
  • Server: 15#.#9.60.149; Command: MODE x86|x|0|337844|unknown -xi\n
  • Server: 15#.#9.60.149; Command: JOIN #error :877\n

Curing recommendations


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