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Linux.Siggen.1531

Added to the Dr.Web virus database:2019-03-24
Virus description added:

Technical Information

To ensure autorun and distribution:
Creates or modifies the following files:
  • /etc/inittab
  • /var/spool/cron/crontabs/root
  • /etc/rc.local
Malicious functions:
Substitutes application name for:
  • kcd7q7u613wg
Modifies router settings:
  • /bin/nvram
Launches processes:
  • sh -c cat /etc/inittab | grep -v \"<SAMPLE_FULL_PATH>\" > /etc/inittab2
  • sh -c crontab -l | grep <SAMPLE_FULL_PATH> || (crontab -l ; echo \"* * * * * <SAMPLE_FULL_PATH> > /dev/null 2>&1 &\") | crontab - > /dev/null 2>&1 &
  • grep -v <SAMPLE_FULL_PATH>
  • cat /etc/inittab
  • crontab -l
  • grep <SAMPLE_FULL_PATH>
  • sh -c echo \"0:2345:respawn:<SAMPLE_FULL_PATH>\" >> /etc/inittab2
  • sh -c cat /etc/inittab2 > /etc/inittab
  • crontab -
  • 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 cp -f <SAMPLE_FULL_PATH> /dev/shm/<SAMPLE>
  • sh -c /bin/uname -n
  • sh -c nvram get router_name
  • /bin/uname -n
  • cp -f <SAMPLE_FULL_PATH> /dev/shm/<SAMPLE>
  • sh -c cat /etc/inittab | grep -v \"/dev/shm/<SAMPLE>\" > /etc/inittab2
  • sh -c crontab -l | grep /dev/shm/<SAMPLE> || (crontab -l ; echo \"* * * * * /dev/shm/<SAMPLE> > /dev/null 2>&1 &\") | crontab - > /dev/null 2>&1 &
  • grep -v /dev/shm/<SAMPLE>
  • grep /dev/shm/<SAMPLE>
  • sh -c echo \"0:2345:respawn:/dev/shm/<SAMPLE>\" >> /etc/inittab2
Performs operations with the file system:
Modifies file access rights:
  • /var/spool/cron/crontabs/tmp.mC76zR
  • /var/spool/cron/crontabs/tmp.GXuzxu
Creates or modifies files:
  • /etc/inittab2
  • /var/spool/cron/crontabs/tmp.mC76zR
  • /dev/shm/<SAMPLE>
  • /var/spool/cron/crontabs/tmp.GXuzxu
Deletes files:
  • /etc/inittab2
Network activity:
Awaits incoming connections on ports:
  • 127.0.0.1:59000
Establishes connection:
  • <LOCAL_DNS_SERVER>
  • 18#.##.149.22:2407
Connects to the following servers over the IRC protocol:
  • Server: 18#.#1.149.22; Command: NICK A5|b|0|1522151|unknown\nUSER muhstik localhost localhost :muhstik-11052018\n
DNS ASK:
  • ir#.##-zahlung.eu

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