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Linux.Siggen.2291

Added to the Dr.Web virus database: 2019-10-30

Virus description added:

Technical Information

Malicious functions:
Substitutes application name for:
  • sshd
Modifies firewall settings:
  • iptables -I INPUT -p tcp --destination-port 22 -j DROP
  • iptables -I INPUT -p tcp --destination-port 23 -j DROP
  • iptables -I INPUT -p tcp --destination-port 2323 -j DROP
  • iptables -I OUTPUT -p tcp --source-port 22 -j DROP
  • iptables -I OUTPUT -p tcp --source-port 23 -j DROP
  • iptables -I OUTPUT -p tcp --source-port 2323 -j DROP
  • iptables -I INPUT -p udp --destination-port 61750 -j ACCEPT
  • iptables -I OUTPUT -p udp --source-port 61750 -j ACCEPT
  • iptables -I PREROUTING -t nat -p udp --destination-port 61750 -j ACCEPT
Launches processes:
  • sh -c echo 3 > /proc/sys/vm/drop_caches
  • sh -c iptables -I INPUT -p tcp --destination-port 22 -j DROP
  • sh -c iptables -I INPUT -p tcp --destination-port 23 -j DROP
  • sh -c iptables -I INPUT -p tcp --destination-port 2323 -j DROP
  • sh -c iptables -I OUTPUT -p tcp --source-port 22 -j DROP
  • sh -c iptables -I OUTPUT -p tcp --source-port 23 -j DROP
  • sh -c iptables -I OUTPUT -p tcp --source-port 2323 -j DROP
  • sh -c iptables -I INPUT -p udp --destination-port 61750 -j ACCEPT
  • sh -c iptables -I OUTPUT -p udp --source-port 61750 -j ACCEPT
  • sh -c iptables -I PREROUTING -t nat -p udp --destination-port 61750 -j ACCEPT
Performs operations with the file system:
Creates or modifies files:
  • /proc/self/oom_score_adj
  • /proc/531/oom_score_adj
  • /proc/sys/vm/drop_caches
Network activity:
Awaits incoming connections on ports:
  • 127.0.0.1:14737
  • 0.0.0.0:61750
Establishes connection:
  • [:##]:61750
  • 127.0.0.1:61750

Curing recommendations


Linux

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