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Trojan-Dropper.Win32.Agent.ezqm

Detected Jun 25 2011 20:01 GMT
Released Jun 25 2011 22:50 GMT
Published Sep 09 2011 16:26 GMT

Manual description Auto description
This description was created by experts at Kaspersky Lab. It contains the most accurate information available about this program.

Technical Details
Payload
Removal instructions

Technical Details

A trojan program that installs and launches other software on the infected computer without the user's knowledge. It is a Windows application (PE-EXE file). 231124 bytes. Written in C++.


Payload

After launching, the trojan searches for the launched process named:

Garss.exe
If this process has been launched, the trojan terminates its implementation. The trojan then retrieves the file saved in the temporary file directory under the following name from its body:
%Temp%\<rnd>_res.tmp
where rnd is a random digital sequence. It then moves this file and saves it under the following name:
%Documents and Settings%\QQCRT.DLL
The file is 22154588 bytes and is detected by Kaspersky Antivirus as Trojan-GameThief.Win32.Magania.erpe. The trojan also moves the system file:
%System%\rundll32.exe
to
C: \Program Files\Garss.exe
Then, using the command line, it launches the malicious library for execution:
C:\Program Files\Garss.exe "C:\Documents and Settings\QQCRT.DLL" Main
To start up the malicious library, the trojan modifies the "BITS" system service. The trojan therefore creates and launches a system registry file under the following name:
C:\1.reg
after which the following information is added to the system registry:
[HKLM\System\CurrentControlSet\Services\BITS]
"Type"=dword:00000020
"Start"=dword:00000002
"ErrorControl"=dword:00000001
"ImagePath"="%SystemRoot%\system32\svchost.exe -k netsvcs"
"DisplayName"="Background Intelligent Transfer Service (BITS)"
"DependOnService"=hex(7):52,70,63,53,73,00,00
"DependOnGroup"=hex(7):00
"ObjectName"="LocalSystem"
"Description"="Ensures the transfer of data between clients and severs in the background. If the BITS service is disabled, options such as Windows Update will not work properly."
"FailureActions"=hex:00,00,00,00,00,00,00,00,00,00,00,00,03,00,00,00,68,e3,0c,\
00,01,00,00,00,60,ea,00,00,01,00,00,00,60,ea,00,00,01,00,00,00,60,ea,00,00

[HKLM\System\CurrentControlSet\Services\BITS\Parameters]
"ServiceDll"="%Documents and Settings%\QQCRT.DLL"
After launching, the "1.reg" file is deleted. The trojan also searches for the following antivirus processes:
RsTray.exe
360tray.exe
and runs active resistance to anti-virus applications in separate strings. The trojan may also copy its executable file under the following name:
C:\Program Files\QQ.EXE
It creates a file entitled:
C:\LoadLibrary.exe
which may also be moved by the trojan and saved under the following name:
%Documents and Settings%\%Current User%\Main menu\X.exe
The file is 36752 bytes. The trojan uses this file to launch the malicious library. It retrieves the following certificate from its body and installs this:
%WinDir%\Windows.cer – which is 590 bytes.
After its implementation, the trojan deletes itself.


Removal instructions

If your computer has not been protected with anti-virus software and has been infected with malware, you will need to take the following actions to delete this:

  1. Stop running the "BITS" service.
  2. Delete the following file:
    %Documents and Settings%\QQCRT.DLL
  3. Restore the "ServiceDll" parameter value for the system registry key:
    [HKLM\System\CurrentControlSet\Services\BITS\Parameters]
    "ServiceDll"="%Documents and Settings%\QQCRT.DLL"
    
    change to
    [HKLM\System\CurrentControlSet\Services\BITS\Parameters]
    "ServiceDll" = "%SystemRoot%\System32\qmgr.dll"
    
  4. Restore the "BITS" service.
  5. Delete the following files:
    C:\Program Files\QQ.EXE
    C:\LoadLibrary.exe
    %Documents and Settings%\%Current User%\Main menu\X.exe
    %WinDir%\Windows.cer
    
  6. Rename the file:
    C: \Program Files\Garss.exe
    to
    %System%\rundll32.exe
  7. Run a full Kaspersky Antivirus scan of the computer with updated antivirus databases (download trial version).


MD5: b8ae1e3ce04afa9d7aa1752b9e93641b
SHA1: 03af00527ff7710b978ed32a81250d29fcbeead2


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Trojan-Dropper

Trojan-Dropper programs are designed to secretly install malicious programs built into their code to victim computers.

This type of malicious program usually save a range of files to the victim’s drive (usually to the Windows directory, the Windows system directory, temporary directory etc.), and launches them without any notification (or with fake notification of an archive error, an outdated operating system version, etc.).

Such programs are used by hackers to:

  • secretly install Trojan programs and/or viruses
  • protect known malicious programs from being detected by antivirus solutions; not all antivirus programs are capable of scanning all the components inside this type of Trojans.

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