![]() ![]() The malware then installs itself as a service called "MBAMSvc" and proceeds to download an additional malicious payload, which is currently a cryptocurrency miner called Bitminer, a Monero miner based on XMRig. ![]() ![]() The malware notifies victims that Malwarebytes was successfully installed, which is not true, as the program cannot be opened. The malware installs a fake Malwarebytes program to "%ProgramFiles(x86)%\Malwarebytes" and hides a majority of the malicious payload inside one of the two dlls, Qt5Help.dll. What happens when the fake installer is launchedĪfter executing one of the fake Malwarebytes installers, a fake Malwarebytes setup wizard appears. The person or people behind this can change the malicious payload at any time, distributing other malicious programs to infected PCs. All other portable executable (PE) files packed inside the installer are signed with valid Malwarebytes or Microsoft certificates. The fake installation file, MBSetup2.exe, is an unsigned file which contains malicious dll files called Qt5Help.dll and Qt5WinExtras.dll with invalid digital signatures. The cybercriminals behind this have repackaged the Malwarebytes installer to contain a malicious payload. As of yet, we do not know where or how the fake installation file is being distributed, but we can confirm that the installation files are not being distributed via official Malwarebytes channels, which remain trusted sources. Avast has protected nearly 100K Avast and AVG users from the fake installation files, which are mostly spreading in Russia, the Ukraine, and Eastern Europe. The most prevalent filename under which one of the installation files is being distributed is “MBSetup2.exe”. On Friday, August 21, 2020, we began detecting fake Malwarebytes installation files containing a backdoor that loads a Monero miner based on XMRig onto infected PCs. Monero miner based on XMRig infects PCs via illegitimate software downloads
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