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 settings\administrator\local settings\temp\xtreme\xtremeserver.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 settings\administrator\local settings\temp\xtreme\xtremeserver.exe"
To subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Adds value: "HKCU"
With data: "c:\documents and settings\administrator\local settings\temp\xtreme\xtremeserver.exe"
To subkey: HKCU\Software\Microsoft\windows\currentversion\run
Adds value: StubPath
With data: "c:\documents and settings\administrator\local settings\temp\xtreme\xtremeserver.exe"
To subkey: hklm\software\microsoft\active setup\installed components\{4c545v67-vdf7-r23m-6j1p-131bxv0a7x27}
The malware creates the following files on an affected computer:
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:
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:
HKCU\Software\Microsoft\Internet Explorer\Toolbar
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.