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ニュース

Linux.Siggen.2237

Added to the Dr.Web virus database: 2019-10-15

Virus description added:

Technical Information

To ensure autorun and distribution:
Creates or modifies the following files:
  • /etc/cron.d/root
  • /var/spool/cron/crontabs/root
  • /etc/init.d/sshservice
  • /etc/init.d/.depend.boot
  • /etc/init.d/.depend.start
  • /etc/init.d/.depend.stop
Creates or modifies the following symlinks:
  • /etc/rc0.d/K01sshservice
  • /etc/rc1.d/K01sshservice
  • /etc/rc2.d/S01sshservice
  • /etc/rc3.d/S01sshservice
  • /etc/rc4.d/S01sshservice
  • /etc/rc5.d/S01sshservice
  • /etc/rc6.d/K01sshservice
Malicious functions:
Launches itself as a daemon
Compiles a program from source codes:
  • gcc /usr/local/lib/libevent_extrad.c -Wall -shared -fPIC -ldl -o /usr/local/lib/libevent_extrad.so
Manages services:
  • systemctl enable sshservice.service
  • /usr/sbin/update-rc.d sshservice defaults
  • systemctl daemon-reload
  • /usr/sbin/update-rc.d sshservice enable
  • systemctl reload sshservice.service
Launches processes:
  • <SAMPLE_FULL_PATH> [kworker]
  • <SAMPLE_FULL_PATH> [kmpath_rdacd]
  • /bin/sh -c export PATH=$PATH:/bin:/usr/bin:/sbin:/usr/local/bin:/usr/sbin;chkconfig --add sshservice
  • /bin/sh -c export PATH=$PATH:/bin:/usr/bin:/sbin:/usr/local/bin:/usr/sbin;systemctl enable sshservice.service;systemctl reload sshservice.service
  • /sbin/insserv sshservice
  • /bin/sh -c export PATH=$PATH:/bin:/usr/bin:/sbin:/usr/local/bin:/usr/sbin;gcc /usr/local/lib/libevent_extrad.c -Wall -shared -fPIC -ldl -o /usr/local/lib/libevent_extrad.so
Performs operations with the file system:
Modifies file access rights:
  • /etc/hosts
  • /etc/cron.d/root
  • /var/spool/cron/root
  • /var/spool/cron/crontabs/root
  • /usr/local/lib/libevent_extrad.c
  • /usr/local/lib/libevent_extrad.so
  • /etc/ld.so.preload
Creates symlinks:
  • /etc/systemd/system/multi-user.target.wants/sshservice.service
Creates or modifies files:
  • /usr/local/sbin/<SAMPLE>
  • /etc/hosts
  • /var/spool/cron/root
  • /usr/lib/systemd/system/sshservice.service
  • /lib/systemd/system/sshservice.service
  • /etc/systemd/system/sshservice.service
  • /usr/local/lib/libevent_extrad.c
  • /tmp/cccxogc6.s
  • /tmp/ccty2LiZ.o
  • /tmp/ccicUhcT.res
  • /tmp/cckqcwEH.c
  • /tmp/ccZmVKKB.o
  • /tmp/ccXTfhRv.ld
  • /tmp/cc0OSWXp.le
  • /usr/local/lib/libevent_extrad.so
  • /etc/ld.so.preload
  • /usr/local/sbin/aa_sffs
Deletes files:
  • /etc/ld.so.preload
  • /usr/local/lib/libevent_extrad.so
  • /usr/local/lib/libevent_extrad.c
  • /tmp/ccXTfhRv.ld
  • /tmp/cc0OSWXp.le
  • /tmp/cckqcwEH.c
  • /tmp/ccZmVKKB.o
  • /tmp/ccicUhcT.res
  • /tmp/ccty2LiZ.o
  • /tmp/cccxogc6.s
Network activity:
Awaits incoming connections on ports:
  • 127.0.0.1:61961
Establishes connection:
  • <LOCAL_DNS_SERVER>
  • 127.0.0.1:61961
DNS ASK:
  • cr##.#######bety6vifaxsi9vovnc9jjay2l.com
Other:
Collects RAM information

Curing recommendations

Linux

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