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DNSChanger was distributed as a drive-by download claiming to be a video codec needed to view content on a Web site, particularly appearing on rogue pornography sites.Once installed, the malware then modified the system's Domain Name System (DNS) configuration, pointing them to rogue name servers operated through affiliates of Rove Digital. [3]
The trojan is commonly found as a small file (+/- 1.5 kilobytes) that is designed to change the NameServer registry key value to a custom IP address or domain that is encrypted in the body of the trojan itself. As a result of this change, the victim's device would contact the newly assigned DNS server to resolve names of malicious webservers. [4]
DNS hijacking, DNS poisoning, or DNS redirection is the practice of subverting the resolution of Domain Name System (DNS) queries. [1] This can be achieved by malware that overrides a computer's TCP/IP configuration to point at a rogue DNS server under the control of an attacker, or through modifying the behaviour of a trusted DNS server so that it does not comply with internet standards.
MaraDNS is a free software DNS server by Sam Trenholme that claims a good security history and ease of use. [9] [10] In order to change any DNS records, MaraDNS needs to be restarted. Like djbdns dnscache, the MaraDNS 2.0 stand-alone recursive resolver ("Deadwood") does not use threads.
Microsoft Windows Server operating systems can run the DNS Server service. This is a monolithic DNS server that provides many types of DNS service, including caching, Dynamic DNS update, zone transfer, and DNS notification. DNS notification implements a push mechanism for notifying a select set of secondary servers for a zone when it is updated.
The group that created Zlob has also created a Mac Trojan with similar behaviors (named RSPlug). [6] Some variants of the Zlob family, like the so-called "DNSChanger", add rogue DNS name servers to the registry of Windows-based computers [7] and attempt to hack into any detected router to change the DNS settings, potentially re-routing traffic from legitimate web sites to other suspicious web ...
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Like the DNS, it is implemented in two parts, a server service (that manages the embedded Jet Database, server to server replication, service requests, and conflicts) and a TCP/IP client component which manages the client's registration and renewal of names, and takes care of queries. Basically, Windows Internet Name Service (WINS) is a legacy ...