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Backdoor:Win32/Zegost.DQ

First posted on 15 February 2019.
Source: Microsoft

Aliases :

Backdoor:Win32/Zegost.DQ is also known as W32.Virut.CF, PE_VIRUX.S-2.

Explanation :

Installation This threat can create files on your PC, including:   %ProgramFiles%microsoft qiugkwsukemck.exe

It modifies the registry so that it runs each time you start your PC. For example:

In subkey: HKLMSOFTWAREMicrosoftWindowsCurrentVersionRun Sets value: "Ddmaud jfytbwkg"
With data: "%ProgramFiles%microsoft qiugkwsukemck.exe"  

The malware uses code injection to make it harder to detect and remove. It can inject code into running processes.

Payload

Allows backdoor access and control

This threat can give a malicious hacker access and control of your PC. They can then perform a number of different actions, such as:

Deleting files Downloading and running files Logging your keystrokes or stealing your sensitive data Modifying your system settings Running or stopping applications Spreading malware to other PCs Uploading files

Connects to a remote host

We have seen this threat connect to a remote host, including: yuhen520.f3322.net using port 53 ilo.brenz.pl using port 53 ant.trenz.pl using port 53 ykcquf.com using port 53 ciainb.com using port 53 ztrjcs.com using port 53 Malware can connect to a remote host to do any of the following:Check for an Internet connectionDownload and run files (including updates or other malware)Report a new infection to its authorReceive configuration or other dataReceive instructions from a malicious hackerSearch for your PC locationUpload information taken from your PCValidate a digital certificate

It can stop some processes from running on your PC, including:

ashdisp.exe avcenter.exe egui.exe knsdtray.exe kvmonxp.exe kxetray.exe mcshield.exe ravmond.exe rundll32.exe tmbmsrv.exe

Bypasses firewall

This threat tries to bypass your firewall by modifying the registry. For example:

HKLMsystemcurrentcontrolsetservicessharedaccessparametersfirewallpolicy

You might need to restore your Windows Firewall settings.

Additional information

Creates a mutex

This threat can create one or more mutexes on your PC. For example:

c:!windows!system32!config!systemprofile!appdata!local!microsoft!windows!history!history.ie5! c:!windows!system32!config!systemprofile!appdata!local!microsoft!windows!temporary internet files!content.ie5! c:!windows!system32!config!systemprofile!appdata!roaming!microsoft!windows!cookies!

It might use this mutex as an infection marker to prevent more than one copy of the threat running on your PC.

This malware description was published using automated analysis of file SHA1 d8dc89f8203a5c53a22693f13ca735f2da9d1f98.

Last update 15 February 2019

 

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