According to bitdefender blog a malware is included in modified installers for well-known programs, such as KMSPICO , winrar ... Once installed on a computer, Redirector.Paco modifies its Internet Settings to use a Web proxy server specified by the attackers in a PAC (Proxy auto-config) file.
The malicious infection chain starts with a modified MSI file. The installation files usually belong to known benign programs such as “WinRAR 5.2 msi”, “WinRAR 5.11”, “YouTube Downloader 1.0.1”, “WinRAR 5.11 Final”, “”Connectify 1.0.1”, “Stardock Start8 1.0.1”, “KMSPico 9.3.3”. The installation files are modified using Advanced Installer1 .
How it works
The malware’s objective is to redirect all traffic performed when using a popular search engine (such as Google, Yahoo or Bing) and replace the results with others obtained from a Google custom search. The goal is to help cyber-criminals earn money from the AdSense program.
Google’s AdSense for Search program places contextually relevant ads on Custom Search Engine’s search results pages and shares a portion of its advertising revenue with AdSense partners.
To redirect the traffic the malware performs a few simple registry tweaks. It modifies the “AutoConfigURL” and “AutoConfigProxy” values from the “Internet Settings” registry key so that for every request that a user makes, a PAC (Proxy auto-config) file will be queried. This file tells the browser to redirect the traffic to a different address.
The malware tries to make the search results look authentic. However, there are some markers that would normally raise suspicions.
In the status bar of the browser, messages like “Waiting for proxy tunnel” or “Downloading proxy script” may be displayed. Secondly, the Google page takes abnormally long to load. Furthermore, the malware doesn’t show the typical yellow ‘o’ characters above the page numbers.
Download minitoolbox and run it.
Checkmark the following checkboxes:
Report IE Proxy Settings
Reset IE Proxy Settings
Report FF Proxy Settings
Reset FF Proxy Settings
List content of Hosts
List IP configuration
List Winsock Entries
List last 10 Event Viewer log
List Installed Programs
List Users, Partitions and Memory size.
Click Go and post the result (Result.txt). A copy of Result.txt will be saved in the same directory the tool is run.
To repair your system , download AdwCleaner and scan your pc for malwares.