Trojan-PSW:W32/Papras.DC

Summary

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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

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Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.

Technical Details

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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:

• kernel32.dll!CreateProcessA
• kernel32.dll!CreateProcessA
• kernel32.dll!CreateProcessA
• kernel32.dll!CreateProcessW
• kernel32.dll!CreateProcessW
• kernel32.dll!CreateProcessW
• ntoskrnl.exe!NtEnumerateValueKey
• ntoskrnl.exe!NtQueryDirectoryFile
• ntoskrnl.exe!NtQuerySystemInformation
• wininet.dll!HttpSendRequestA
• wininet.dll!HttpSendRequestA
• wininet.dll!HttpSendRequestA
• wininet.dll!HttpSendRequestW
• wininet.dll!HttpSendRequestW
• wininet.dll!InternetCloseHandle
• wininet.dll!InternetCloseHandle
• wininet.dll!InternetCloseHandle
• wininet.dll!InternetQueryDataAvailable
• wininet.dll!InternetQueryDataAvailable
• wininet.dll!InternetQueryDataAvailable
• wininet.dll!InternetReadFile
• wininet.dll!InternetReadFile
• wininet.dll!InternetReadFile
• wininet.dll!InternetReadFileExA
• wininet.dll!InternetReadFileExA
• wininet.dll!InternetReadFileExA

The malware sniffs for the following information:

• ICQ, IMAP, FTP, and POP3 logon credentials
• Information passed through webforms

Papras.DC attempts to establish a connection to the following domain through HTTP in order to pass the stolen information:

• http://pull.dolcebrava.com