TROJ_XTRAT.XXM
Windows
Threat Type: Trojan
Destructiveness: No
Encrypted: No
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan drops the following files:
- %Application Data%\Microsoft\Windows\9f51Yo.cfg
- %Application Data%\Microsoft\Windows\9f51Yo.dat
(Note: %Application Data% is the Application Data folder, where it usually is C:\Documents and Settings\{user name}\Application Data on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
It drops the following copies of itself into the affected system:
- %User Temp%\iMarch05.exe
- %Windows%\InstallDir\DLL.exe
(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)
It adds the following processes:
- svchost.exe
- iexplore.exe
It injects codes into the following process(es):
- svchost.exe
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
HKCU = %Windows%\InstallDir\DLL.exe
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
HKLM = %Windows%\InstallDir\DLL.exe
It drops the following files:
- %Start Menu%\Programs\Startup\iMarch.lnk
(Note: %Start Menu% is the Start Menu folder, where it usually is C:\Documents and Settings\{user name}\Start Menu on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Roaming\Microsoft\Windows\Start Menu on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)
Other System Modifications
This Trojan adds the following registry keys:
HKEY_CURRENT_USER\Software\9f51Yo
HKEY_LOCAL_MACHINE\Software\Microsoft\
Active Setup\Installed Components\{Random Values}
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Active Setup\Installed Components\{Random Values}
StubPath = %Windows%\InstallDir\DLL.exe restart
HKEY_CURRENT_USER\Software\9f51Yo
ServerStarted = {MM/DD/YYYY hh:mm:ss}
Backdoor Routine
This Trojan connects to the following URL(s) to send and receive commands from a remote malicious user:
- http://{BLOCKED}in.com/U6cYn4mX
- http://respados.{BLOCKED}s.org:1502/1234567890.functions
Other Details
This Trojan does the following:
- It loads its DLL component in the following directory:
- %System Root%\~tempdir\tempdll.dll -> detected as TROJ_XTRAT.XXM
(Note: %System Root% is the Windows root folder, where it usually is C:\ on all Windows operating system versions.)
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.
Step 3
Restart in Safe Mode
Step 4
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software
- 9f51Yo
- 9f51Yo
- In HKEY_LOCAL_MACHINE\Software\Microsoft\Active Setup\Installed Components
- {Random Values}
- {Random Values}
Step 5
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- HKCU = %Windows%\InstallDir\DLL.exe
- HKCU = %Windows%\InstallDir\DLL.exe
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- HKLM = %Windows%\InstallDir\DLL.exe
- HKLM = %Windows%\InstallDir\DLL.exe
Step 6
Search and delete this file
- %Application Data%\Microsoft\Windows\9f51Yo.cfg
- %Application Data%\Microsoft\Windows\9f51Yo.dat
- %Start Menu%\Programs\Startup\iMarch.lnk
- %System Root%\~tempdir\tempdll.dll
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_XTRAT.XXM. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
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