TROJ_INJECT.OH
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Trojan
Destructiveness: No
Encrypted:
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
539,648 bytes
EXE
Yes
12 Aug 2013
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 copies of itself into the affected system:
- %User Profile%\Windows\SyncHost.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
It creates the following folders:
- %User Profile%\Application Data\dclogs
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
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\RunOnce
Windows Management Instrumentation = "%User Profile%\Windows\wbemcore.exe"
Other System Modifications
This Trojan deletes the following files:
- {malware path and file name}:zone.identifier
- %User Profile%\Windows\wbemcore.exe:Zone.Identifier
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.540.46265
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.540.46265
- %User Profile%\v2.0.50727.42\security.config.cch.540.46406
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.152.63921
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.152.63937
- %User Profile%\v2.0.50727.42\security.config.cch.152.64093
- %User Profile%\Windows\SyncHost.exe:Zone.Identifier
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.. %Windows% is the Windows folder, which is usually C:\Windows.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\DC3_FEXEC
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\RunOnce
It adds the following registry entries:
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:14 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:19 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:22 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:26 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:30 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:34 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:37 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:41 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:44 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:48 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:51 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:55 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:22:59 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:02 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:06 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:09 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:14 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:18 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:21 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:25 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:28 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:32 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:36 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:39 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:42 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:46 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:49 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:53 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:23:56 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:24:00 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
HKEY_CURRENT_USER\Software\DC3_FEXEC
8/4/2013 at 5:24:03 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Windows\wbemcore.exe
- %User Profile%\Windows\SyncHost.exe
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
9.300
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
Restart in Safe Mode
Step 3
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
- DC3_FEXEC
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion
- RunOnce
Step 4
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\RunOnce
- Windows Management Instrumentation = "%User Profile%\Windows\wbemcore.exe"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:14 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:19 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:22 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:26 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:30 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:34 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:37 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:41 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:44 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:48 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:51 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:55 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:22:59 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:02 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:06 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:09 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:14 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:18 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:21 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:25 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:28 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:32 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:36 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:39 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:42 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:46 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:49 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:53 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:23:56 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:24:00 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
- In HKEY_CURRENT_USER\Software\DC3_FEXEC
- 8/4/2013 at 5:24:03 PM = "{1c6961c0-f82d-11e0-a6bd-806d6172696f-1756172240}"
Step 5
Search and delete these components
- %User Profile%\Windows\wbemcore.exe
- %User Profile%\Windows\SyncHost.exe
Step 6
Search and delete this folder
- %User Profile%\Application Data\dclogs
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_INJECT.OH. 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.
Step 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- {malware path and file name}:zone.identifier
- %User Profile%\Windows\wbemcore.exe:Zone.Identifier
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.540.46265
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.540.46265
- %User Profile%\v2.0.50727.42\security.config.cch.540.46406
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\security.config.cch.152.63921
- %Windows%\Microsoft.NET\Framework\v2.0.50727\config\enterprisesec.config.cch.152.63937
- %User Profile%\v2.0.50727.42\security.config.cch.152.64093
- %User Profile%\Windows\SyncHost.exe:Zone.Identifier
Did this description help? Tell us how we did.