October 2012,Hanaro Telecom, Inc. / chinaunicom.com.cn is running block-listed RBN IP addresses. See:
http://doc.emergingthreats.net/pub/Main/RussianBusinessNetwork/RussianBusinessNetworkIPs.txt
Example:
121.17.125.0/24 China Unicom
116.255.128.0/17 ZhengZhou GIANT > China Unicom / AS4837
AND
chinaunicom.com.cn is the website contact listed for cnc-noc.net / AS4837 / CNC Group. See:
www.robtex.com/as/as4837.html#asinfo (listing the chinaunicom.com.cn website)
See here for the poor reputation of the cnc-noc.net / AS4837 network:
www.mywot.com/scorecard/cnc-noc.net/comment-41021638