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 |
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.exeIf 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.tmpwhere rnd is a random digital sequence. It then moves this file and saves it under the following name:
%Documents and Settings%\QQCRT.DLLThe 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.exeto
C: \Program Files\Garss.exeThen, using the command line, it launches the malicious library for execution:
C:\Program Files\Garss.exe "C:\Documents and Settings\QQCRT.DLL" MainTo 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.regafter 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.exeand 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.EXEIt creates a file entitled:
C:\LoadLibrary.exewhich may also be moved by the trojan and saved under the following name:
%Documents and Settings%\%Current User%\Main menu\X.exeThe 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:
- Stop running the "BITS" service.
- Delete the following file:
%Documents and Settings%\QQCRT.DLL
- Restore the "ServiceDll" parameter value for the
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"
- Restore the "BITS" service.
- Delete the following files:
C:\Program Files\QQ.EXE C:\LoadLibrary.exe %Documents and Settings%\%Current User%\Main menu\X.exe %WinDir%\Windows.cer
- Rename the file:
C: \Program Files\Garss.exe
to%System%\rundll32.exe
- Run a full Kaspersky Antivirus scan of the computer with updated antivirus databases (
).
MD5: b8ae1e3ce04afa9d7aa1752b9e93641b
SHA1: 03af00527ff7710b978ed32a81250d29fcbeead2
Summary
Technical details
File size of 231124 bytes.
Installation
Makes copies of itself with the following names once launched:
- Standard directory for programs installed on Windows OS (usually, C:\Program Files)%Program Files%\QQ.EXE
Creates the following files on an infected computer:
-
Directory for storage of temporary files on Windows OS (usually, C:\Documents and Settings\
\Local Settings\Temp) %Temp%\131468_res.tmp (Kaspersky Anti-Virus detects as Trojan-GameThief.Win32.Magania.erpe) - Directory of users' settings%Documents and Settings%\QQCRT.DLL (Kaspersky Anti-Virus detects as Trojan-GameThief.Win32.Magania.erpe)
-
Directory for storage of temporary files on Windows OS (usually, C:\Documents and Settings\
\Local Settings\Temp) %Temp%\163312_res.tmp - C:\LoadLibrary.exe
- Windows directory (usually, C:\Windows)%Windir%\Windows.cer
-
Current user directory (usually, C:\Documents and Settings\
) %UserDir%\Start Menu\X.exe
Malicious activity
- Standard directory for programs installed on Windows OS (usually, C:\Program Files)%Program Files%\Garss.exe
Launches files shown below for execution:
- Standard directory for programs installed on Windows OS (usually, C:\Program Files)%Program Files%\Garss.exe
Other activities
Runs the following files (commands):
- Windows system directory (usually, C:\Windows\System32) %System%\rundll32.exe cryptext.dll,CryptExtAddCER Windows directory (usually, C:\Windows)%Windir%\Windows.cer
Searches for the following windows:
| Class: | #32770 |
| Title | |
Deletes the following files on an infected computer:
- <path to source program><file of source program >
-
Directory for storage of temporary files on Windows OS (usually, C:\Documents and Settings\
\Local Settings\Temp) %Temp%\131468_res.tmp -
Directory for storage of temporary files on Windows OS (usually, C:\Documents and Settings\
\Local Settings\Temp) %Temp%\163312_res.tmp - C:\LoadLibrary.exe
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