Backdoor:Win32/Prorat.K allows unauthorized access and control of an affected computer.
Installation
When executed, Backdoor:Win32/Prorat.K copies itself to the following locations:
- %windir%\services.exe
- %windir%\system\sservice.exe
- <system folder>\fservice.exe
Note: <system folder> refers to a variable location that is determined by the malware by querying the Operating System. The default installation location for the System folder for Windows 2000 and NT is C:\Winnt\System32; and for XP, Vista, and 7 is C:\Windows\System32.
The malware modifies the following registry entries to ensure that its copy executes at each Windows start:
Adds value: "DirectX For Microsoft® Windows"
With data: "c:\windows\system32\fservice.exe"
To subkey: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
Adds value: "Shell"
With data: "explorer.exe c:\windows\system32\fservice.exe"
To subkey: HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
The malware creates the following files on an affected computer:
Payload
Terminates processes
Backdoor:Win32/Prorat.K terminates a list of specified processes, including those related to particular security applications, should they be running on an affected computer. Backdoor:Win32/Prorat.K attempts to terminate the following processes (for example):
- _avpm.exe
- alg.exe
- AVGW.EXE
- avp.exe
- avp32.exe
- avpcc.exe
- DRWEB32.EXE
- fsav.exe
- NAVW32.exe
- NOD32.EXE
- PERSFW.EXE
- SCAN32.exe
- ZONEALARM.EXE
Note: This list of processes was compiled after observing this behavior in our analysis systems. This list should serve as an example of this behavior only as it may not prove exhaustive on every affected system.
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/Prorat.K. 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 7aff17a44140e941dd87221f99d36b128bb6249f.
