Risk
8/29/2013
06:45 AM
Tim Wilson
Tim Wilson
Quick Hits
50%
50%

Four Tips For Spotting The Kelihos Botnet Infection

Kelihos keeps coming back -- but it's not tough to detect, Zscaler researcher says

Despite concerted attempts to bring it down, the Kelihos botnet is alive and well and infecting devices all over the Web, according to a new report. The good news is that it's not too hard to spot.

In a blog posted Tuesday, Zscaler researcher Chris Mannon offers an analysis of the latest iterations of Kelihos, and four tip-offs that indicate its infection.

"Firstly, the use of P2P [peer to peer] style communication via SMTP [Simple Message Transfer Protocol] raised an eyebrow," Mannon says. "Secondly, we observed the overt way the botnet installs several packet capturing utilities and services. This is done so that the infection can monitor ports 21, 25, and 110 for username and password information."

Third, the botnet attempts to categorize its new victim by using legitimate services to gather intelligence, Mannon says. In one instance, "the malicious file actually queried the victim's IP address on Barracuda Networks, SpamHaus, Mail-Abuse, and Sophos," the blog says. "These services primarily exist to notify users of abuse seen on the site or IP address. Kelihos is using it to to determine if the new victim is already seen as malicious or not.

"A final point to make about this threat is that it makes no attempt to hide exactly how loud it is regarding network activity," Mannon says. "We noted a spike in TCP traffic across a distinct 563 IP addresses in the span of two minutes. Network administrators should take extra care in monitoring users with anomalous levels of traffic. A single node giving off so much traffic to different services in such a small window" could indicate that an end user is infected.

Have a comment on this story? Please click "Add a Comment" below. If you'd like to contact Dark Reading's editors directly, send us a message. Tim Wilson is Editor in Chief and co-founder of Dark Reading.com, UBM Tech's online community for information security professionals. He is responsible for managing the site, assigning and editing content, and writing breaking news stories. Wilson has been recognized as one ... View Full Bio

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Cartoon
Current Issue
Dark Reading December Tech Digest
Experts weigh in on the pros and cons of end-user security training.
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2014-2037
Published: 2014-11-26
Openswan 2.6.40 allows remote attackers to cause a denial of service (NULL pointer dereference and IKE daemon restart) via IKEv2 packets that lack expected payloads. NOTE: this vulnerability exists because of an incomplete fix for CVE 2013-6466.

CVE-2014-6609
Published: 2014-11-26
The res_pjsip_pubsub module in Asterisk Open Source 12.x before 12.5.1 allows remote authenticated users to cause a denial of service (crash) via crafted headers in a SIP SUBSCRIBE request for an event package.

CVE-2014-6610
Published: 2014-11-26
Asterisk Open Source 11.x before 11.12.1 and 12.x before 12.5.1 and Certified Asterisk 11.6 before 11.6-cert6, when using the res_fax_spandsp module, allows remote authenticated users to cause a denial of service (crash) via an out of call message, which is not properly handled in the ReceiveFax dia...

CVE-2014-7141
Published: 2014-11-26
The pinger in Squid 3.x before 3.4.8 allows remote attackers to obtain sensitive information or cause a denial of service (out-of-bounds read and crash) via a crafted type in an (1) ICMP or (2) ICMP6 packet.

CVE-2014-7142
Published: 2014-11-26
The pinger in Squid 3.x before 3.4.8 allows remote attackers to obtain sensitive information or cause a denial of service (crash) via a crafted (1) ICMP or (2) ICMP6 packet size.

Best of the Web
Dark Reading Radio
Archived Dark Reading Radio
Now that the holiday season is about to begin both online and in stores, will this be yet another season of nonstop gifting to cybercriminals?