Attacks/Breaches
6/24/2013
09:48 PM
Connect Directly
Google+
Twitter
RSS
E-Mail
50%
50%
Repost This

South Korean Universities Targeted By Chinese-Speaking Hackers

'PinkStats' malware has been used for hacking nation-state targets for four years

A newly discovered attack tool used by multiple groups of Chinese-speaking attackers has infected more than 1,000 machines in South Korea -- mainly universities and other academic institutions.

The so-called PinkStats malware family has been in use over the past four years, targeting various nation-states and organizations around the globe, according to Aviv Raff, CTO at Seculert, which studied the malware and posted its findings today.

"This is the first proof that there are Chinese-speaking attackers targeting [South Korea] entities," says Raff, who stopped short at confirming the attackers were from China. Even so, he says it's likely that they are Chinese: "These type of custom-made tools are usually created by the people speaking the language used in the tool, [such as where] Mahdi used Farsi strings," he says.

There's no evidence, either, to confirm that PinkStats was also used in the attacks earlier this year on South Korean banks, media networks, and an ISP that wiped hard drives and attached drives of infected machines. They also crippled targeted organizations for hours, and the machines weren't able to reboot. There was speculation of a North Korea or China connection to the attacks.

[Researchers confirm data-destroying malware that hit South Korean media and banks doesn't completely erase data. See Data Can Be Recovered From South Korea Data-Wiping Attacks. ]

PinkStats is a Trojan downloader that can install additional malware components. It camouflages itself by posing as a Web statistics or counter service in its communications to the command-and-control server and in the attacker's administrative panel login window.

In the South Korean attack, PinkStats also downloaded a typical Chinese hacking tool called zxarps that acts as a worm to spread in the victim's local network, via address resolution protocol (ARP) poisoning. The malicious iFrame it injects includes an ActiveX file digitally signed by Thwate. Seculert says the signature was valid as of May 8 and uses "Microsoft Corporation" as the product name and "Liaocheng YuanEr Technology CO., ltd.," as the publisher name -- a phony South Korean company.

PinkStats also installs a DDoS malware tool that goes by "Win8.exe" and poses as South Korean antivirus company AhnLab's V3 Light Framework software. "Up until now, the adversary did not seem to send any specific instructions to the installed DDoS malware. However, with the recent incidents of DDoS attacks against South Korean infrastructure, it is reasonable to assume that this state could change anytime soon," Seculert said in its blog post.

Seculert's Raff says the attackers were trying to amass as much computing power as possible from the South Korean universities. They deployed an additional worm tool that spreads the PinkStats malware within the local university network," he says, probably in order to use the machines for DDoS attacks.

Raff says his firm discovered the PinkStats malware while analyzing one of its customer's logs. That analysis led to Seculert finding evidence of the South Korean attacks. What makes PinkStats unique is that it's a downloader posing as a legitimate Web statistics service. "So even if someone will try to investigate the URL of the malware communication and [get] to the login page, he will see a page saying that is a login for 'statistics administration,'" he says.

Other attacks using PinkStats have downloaded information-stealing Trojans as well, he says.

"It really depends on the group using this tool, and the intent of their current operation and phase," Raff says.

Have a comment on this story? Please click "Add Your Comment" below. If you'd like to contact Dark Reading's editors directly, send us a message. Kelly Jackson Higgins is Senior Editor at DarkReading.com. She is an award-winning veteran technology and business journalist with more than two decades of experience in reporting and editing for various publications, including Network Computing, Secure Enterprise Magazine, ... View Full Bio

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Cartoon
Latest Comment: LOL.
Current Issue
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2013-6213
Published: 2014-04-19
Unspecified vulnerability in Virtual User Generator in HP LoadRunner before 11.52 Patch 1 allows remote attackers to execute arbitrary code via unknown vectors, aka ZDI-CAN-1833.

CVE-2013-6214
Published: 2014-04-19
Unspecified vulnerability in the Integration Service in HP Universal Configuration Management Database 9.05, 10.01, and 10.10 allows remote authenticated users to obtain sensitive information via unknown vectors, aka ZDI-CAN-2042.

CVE-2014-0778
Published: 2014-04-19
The TCPUploader module in Progea Movicon 11.4 before 11.4.1150 allows remote attackers to obtain potentially sensitive version information via network traffic to TCP port 10651.

CVE-2014-1974
Published: 2014-04-19
Directory traversal vulnerability in LYSESOFT AndExplorer before 20140403 and AndExplorerPro before 20140405 allows attackers to overwrite or create arbitrary files via unspecified vectors.

CVE-2014-1983
Published: 2014-04-19
Unspecified vulnerability in Cybozu Remote Service Manager through 2.3.0 and 3.x before 3.1.1 allows remote attackers to cause a denial of service (CPU consumption) via unknown vectors.

Best of the Web