TROJ_BREDOLAB.EM

This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

It deletes itself after execution.

Arrival Details

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

It may be dropped by other malware.

It may be unknowingly downloaded by a user while visiting malicious websites.

Installation

This Trojan drops the following copies of itself into the affected system:

• %User Startup%\srvklw32.exe

(Note: %User Startup% is the current user's Startup folder, which is usually C:\Windows\Profiles\{user name}\Start Menu\Programs\Startup on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu\Programs\Startup on Windows NT, and C:\Documents and Settings\{User name}\Start Menu\Programs\Startup.)

It injects itself into the following processes running in the affected system's memory:

• svchost.exe

Dropping Routine

This Trojan drops the following files:

• C:\Documents and Settings\NetworkService\Application Data\hwzypv.dat
• %Application Data%\avdrn.dat
• %System%\fjhdyfhsn.bat - detected as BAT_KILLFILE.AK

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)

Download Routine

This Trojan accesses the following websites to download files:

• http://{BLOCKED}g.ru/new/controller.php?action=bot&entity_list=&first={random}&rnd={random}&uid=1&guid={random}
• http://{BLOCKED}.{BLOCKED}.203.114/mybackup20.rar
• http://{BLOCKED}.{BLOCKED}.82.186/mybackup20.rar
• http://{BLOCKED}.{BLOCKED}.237.163:8080/images/bot.bin - detected as RTKT_BUBNIX.A
• http://{BLOCKED}.{BLOCKED}.177.87:8080/images/bot.bin - detected as RTKT_BUBNIX.A
• http://{BLOCKED}.{BLOCKED}.50.135:8080/images/bot.bin - detected as RTKT_BUBNIX.A

It then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan deletes itself after execution.