TROJ_DYNAMER.IQ
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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
118,818 bytes
EXE
Yes
13 Dec 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.
Autostart Technique
This Trojan registers as a system service to ensure its automatic execution at every system startup by adding the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\VbSecurity
Other System Modifications
This Trojan deletes the following files:
- %Program Files%\AhnLab\V3 365 Clinic\V3Lup.dll
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)
It adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\VbSecurity\Parameters
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\VbSecurity
DisplayName = "Security"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\VbSecurity
Type = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\VbSecurity
Start = "2"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\VbSecurity
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\VbSecurity
ImagePath = "%SystemRoot%\System32\svchost.exe -k netsvcs"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\VbSecurity
ObjectName = "LocalSystem"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\VbSecurity
Description = "Security Component"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\VbSecurity\Parameters
ServiceDll = "%SystemRoot%\System32\ahmerl.dll"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\SvcHost
netsvcs = "{random characters}"
(Note: The default value data of the said registry entry is {random values}.)
Dropping Routine
This Trojan drops the following files:
- %System%\zgldqk.dep
- %System%\ahmerl.dll
- %Windows%\inf\ahmerl.inf
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.)
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- VbSecurity
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VbSecurity
- Parameters
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_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VbSecurity
- DisplayName = "Security"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VbSecurity
- Type = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VbSecurity
- Start = "2"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VbSecurity
- ErrorControl = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VbSecurity
- ImagePath = "%SystemRoot%\System32\svchost.exe -k netsvcs"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VbSecurity
- ObjectName = "LocalSystem"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VbSecurity
- Description = "Security Component"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\VbSecurity\Parameters
- ServiceDll = "%SystemRoot%\System32\ahmerl.dll"
Step 5
Restore these modified registry values
Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost
- From: netsvcs = "{random characters}"
To: netsvcs = ""{random values}""
- From: netsvcs = "{random characters}"
Step 6
Search and delete these components
- %System%\zgldqk.dep
- %System%\ahmerl.dll
- %Windows%\inf\ahmerl.inf
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DYNAMER.IQ. 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.
- %Program Files%\AhnLab\V3 365 Clinic\V3Lup.dll
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