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Backdoor:Win32/Xtrat.A

First posted on 28 February 2019.
Source: Microsoft

Aliases :

There are no other names known for Backdoor:Win32/Xtrat.A.

Explanation :

Backdoor:Win32/Xtrat.A is a trojan that allows unauthorized access and control of an affected computer. Installation When executed, Backdoor:Win32/Xtrat.A copies itself to c:documents and settingsadministratorlocal settings empxtremextremeserver.exe.
The malware modifies the following registry entries to ensure that its copy executes at each Windows start:

Adds value: "HKLM"
With data: "c:documents and settingsadministratorlocal settings empxtremextremeserver.exe"
To subkey: HKLMSOFTWAREMicrosoftWindowsCurrentVersionRun
Adds value: "HKCU"
With data: "c:documents and settingsadministratorlocal settings empxtremextremeserver.exe"
To subkey: HKCUSoftwareMicrosoftwindowscurrentversion
un
Adds value: StubPath
With data: "c:documents and settingsadministratorlocal settings empxtremextremeserver.exe"
To subkey: hklmsoftwaremicrosoftactive setupinstalled components{4c545v67-vdf7-r23m-6j1p-131bxv0a7x27}
The malware creates the following files on an affected computer:
c:documents and settingsadministratorapplication datamicrosoftwindows--((mutex))--.xtr
The malware utilizes code injection in order to hinder detection and removal. When Backdoor:Win32/Xtrat.A executes, it may inject code into running processes, including the following, for example:

IEXPLORE.EXE svchost.exe
Payload Modifies browser settings Backdoor:Win32/Xtrat.A locks the Internet Explorer toolbar by making the following registry modification:

Adds value: "Locked"
With data: "1"
To subkey: HKCUSoftwareMicrosoftInternet ExplorerToolbar
Allows backdoor access and control The malware allows unauthorized access and control of an affected computer. An attacker can perform any number of different actions on an affected computer using Backdoor:Win32/Xtrat.A. This could include, but is not limited to, the following actions:
Download and execute arbitrary files Upload files Spread to other computers using various methods of propagation Log keystrokes or steal sensitive data Modify system settings Run or terminate applications Delete files
This malware description was produced and published using our automated analysis system's examination of file SHA1 3dee531e2ee60eee11024d08a9a00afd24283647.

Last update 28 February 2019

 

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