TROJ_AGENT.ZJQA
Windows 98, ME, NT, 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
It opens a hidden explorer.exe and calc.exe.
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.
It opens a hidden Internet Explorer window.
TECHNICAL DETAILS
696,128 b bytes
Yes
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:
- %Program Files%\_ksStation.exe
- %Program Files%\Common Files\Microsoft Shared\MSInfo\ksStation.exe
(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)
It injects itself into the following processes running in the affected system's memory:
- iexplore.exe
- calc.exe
Autostart Technique
This Trojan registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows_ksStation
=
(Note: The default value data of the said registry entry is .)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows_ksStation
Type = 110
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows_ksStation
Start = 2
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows_ksStation
ErrorControl = 0
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows_ksStation
ImagePath = %Program Files%\Common Files\Microsoft Shared\MSINFO\ksStation.exe
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows_ksStation
DisplayName = Windows_ksStation
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows_ksStation\Security
=
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\Windows_ksStation\Security
Security = {hex values}
Other Details
This Trojan opens a hidden Internet Explorer window.
It opens the following applications:
- calc.exe
SOLUTION
8.900
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
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\
- Windows_ksStation
- Windows_ksStation
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows_ksStation
- Type=110
- Type=110
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows_ksStation
- Start=2
- Start=2
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows_ksStation
- ErrorControl=0
- ErrorControl=0
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows_ksStation
- ImagePath=%Program Files%\Common Files\Microsoft Shared\MSINFO\ksStation.exe
- ImagePath=%Program Files%\Common Files\Microsoft Shared\MSINFO\ksStation.exe
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows_ksStation
- DisplayName=Windows_ksStation
- DisplayName=Windows_ksStation
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows_ksStation\
- Security
- Security
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Windows_ksStation\Security
- Security={hex values}
- Security={hex values}
Step 4
Scan your computer with your Trend Micro product to delete files detected as TROJ_AGENT.ZJQA. 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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