Remember to unlock the preference panel if there's a lock icon at the bottom. After that, click the Advanced button as well as the DNS tab. Then, select the network that you want on the left. If you login to your router, you might be able to find out which DNS servers it uses. To find and check the DNS server on your Mac, go to the Apple menu > Preferences > Network. Your router is running a caching DNS server, and setting itself as the DNS server via DHCP. For instance SCDynamicStoreCopyDHCPInfo returns some of the dynamic DHCP related data but not the DNS server addresses. The trojan infects both 10.4 and 10.5 versions of Mac OS X. That is the DNS server your mac is using. On the Mac I can probably use the SystemConfiguration framework as mentioned in the first answer, however the exact method of doing so is not immediately obvious. The script is stored in /Library/Internet Plug-Ins and is named ttings. The install script adds a crontab (a configuration file that specifies shell commands to run periodically on a given schedule) to a script to verify the malicious DNS servers remain unchanged. The message contains the operating system version and the host name. Reports BackĪfter installation, the script sends back an HTTP message with information that it successfully infected the system. For example, Trojan:OSX/DNSChanger.A directs traffic to servers located in Ukraine. If for some reason the first isn’t available, your Mac moves on to the next. DNS Settings are made with a tool called scutil. Your Mac starts at the top of the list to choose the DNS server it’ll use. The trojan changes the OS X network settings to use a different DNS server. During the installation, the local machine's DNS settings are adjusted to point towards a malicious server. Once the fake codec is installed, the video will play so as not to raise suspicion.
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