Trojan-PSW:W32/Papras.DC

Classification

Type:Trojan-PSW

Summary

Trojan-PSW.Win32.Papras.DC steals login credentials and other sensitive information on the compromised system. It also drops and uses a rootkit driver to hide itself. The rootkit driver is detected as Rootkit.Win32.Agent.SZ.

Removal

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

Check for the latest database updates
First check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.

Technical Details

Once executed, the malware creates a copy of itself with the following name in the Windows directory:

%windir%\9129837.exe

It creates the following batch file in the current working directory that will be used to delete the original file executed by user:

%cwd%\abcdefg.bat

The malware then installs a kernel-mode driver in the Windows directory in order to hide its activities:

%windir%\new_drv.sys

The .SYS file is detected as Rootkit.Win32.Agent.SZ.It deletes the following file:

%cookies%\index.dat

Papras.DC creates the following process:

%windir%\9129837.exe

The following process and files are hidden by the installed rootkit driver:

%windir%\9129837.exe
%windir%\new_drv.sys

The malware creates the following registry key:

HKCU\Software\Microsoft\InetData

The following values are modified:

[HKCU\Software\Microsoft\InetData] k1 = 3868AB03
[HKCU\Software\Microsoft\InetData] k2 = 438E0B5C
[HKCU\Software\Microsoft\InetData] 220
[HKLM\System\CurrentControlSet\Services\SharedAccess] Start = 00000004
[HKLM\System\CurrentControlSet\Services\wscsvc] Start = 00000004
[HKCU\Software\Microsoft\Windows\CurrentVersion\Run] ttool = C:\WINDOWS\9129837.exe

The following functions are hooked in order to steal user information: