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CATEGORY ARCHIVES: conficker

New and Improved Botnet Feeds

ThreatSTOP has improved our botnet block list by adding a number of C&C servers and DNS servers for botnets that have been taken down by law enforcement. This includes the conficker C&C sinkhole servers (see http://www.confickerworkinggroup.org/wiki/ ) and the IP addresses that the DNS Changer botnet used as DNS servers when redirecting DNS on infected computers (see http://dcwg.org ). These have been added to both the botnets feed and to respective expert mode feeds - sinkhole and DNS changer. We have added these feeds as a service to our subscribers to help them identify computers on their networks that are still infected by these forms of malware as by blocking these addresses on the NAT device makes it easy to identify the infected internal host from its IP address. The "research" popup for a DNS Changer IP address looks like this:

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ThreatSTOP blocking possible Conficker variant

Over the last couple of days we've seen an increasing number of outbound DNS queries to ip addresses on our block lists - principally to ones on the DShield 4000. Since the destination servers are frequently in China and the subscribers have little to do with China this looks unlikely to be genuine traffic. It is however somewhat suggestive of Conficker and other similar fastflux DNS malware which "call home" via a DNS lookup to some randomly generated subdomain of an otherwise apparently genuine domain. The DNS lookup resolves (usually) to a fastflux intermediary that communicates with the botmaster, The DNS server itself is generally not 'bad' per se but it will be under the control of the cyber crooks because they have to feed it the zone changes so frequently and this level of activity would raise a flag in any legitimate DNS hosting service.

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