Trojan-PSW:W32/Sinowal.CP

Summary

A trojan that steals passwords and other sensitive information. It may also secretly install other malicious programs.

Disinfection & Removal

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.

Technical Details

Trojan-PSW:W32/Sinowal.CP drops and loads a password stealing component on the infected system and tries to steal account information from it. It also tries to steal information that is required to access certain online banks' and online payment systems' websites.

Execution

Upon execution, it drops the following files:

• %programfiles%\common files\microsoft shared\web folders\ibm<5-digit randrom number>.dll - Trojan-PSW.Win32.Sinowal.co
• %programfiles%\common files\microsoft shared\web folders\ibm<5-digit randrom number>.dll - Trojan-PSW.Win32.Sinowal.co
• %windir%\temp\$_2341233.tmp
• %windir%\temp\$_2341234.tmp
• %windir%\temp\$_2341235.tmp
• %windir%\temp\$b17a2e8.tmp

It installs itself as a service and adds this Registry key launch point:

• Key:HKLM\System\ControlSet001\Services\gb File:%programfiles%\common files\microsoft shared\web folders\ibm<5-digit randrom number>.dll

The executable file injects the first DLL to the explorer.exe process. It also injects the other DLL to svchost.exe and other running processes.

Activity

This trojan attempts to steal different system and account information from the infected machine. Stolen information may be the following:

• IMAP/POP3/SMTP username, passwords, server information from mail clients such as AK-Mail,Thunderbird,TheBat
• Bookmarks
• E-mail addresses from the Windows Address Book
• Passwords and other data stored from FTP clients such as Trellian FTP, WS_FTP, Total Commander, Crystal FTP Pro and GlobalSCAPE

It also monitors web browsers such as Internet Explorer, Firefox, and Mozilla for online banking information upon access to the following banking sites:

• banking.raiffeisen.at
• bankingportal.naspa.de
• cib.ibanking-services.com
• ykb.teleweb.com.tr

This trojan may also collect certificates from system certificate storage and export certificate stores found. This is done through the PFXExportCertStore function of CRYPT32.DLL, which exports certificates and associated private keys if available.It may also steal system information, such as IP, port number, operating system and send it along with the other stolen information through a POST command on the following sites:

• flickor32.com
• hurbia52.com
• vgnyarm.com