TROJ_ZCLICK.GAV
PWS:Win32/Zbot.ALZ (Microsoft); Trojan-Spy.Win32.Zbot.tqgi (Kaspersky)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/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
282,750 bytes
EXE
No
30 Jul 2014
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 and executes them:
- %System%\{random filename 2}.exe
- %Application Data%\{random foldername}\{random filename}.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista and 7.)
It drops the following files:
- %System%\Tasks\Security Center Update - {number}.job
- %Windows%\Tasks\Security Center Update - {number}.job
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.. %Windows% is the Windows folder, which is usually C:\Windows.)
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\SecurityCenterServer{number}
ImagePath = "%System%\{random filename 2}.exe -service %Application Data%\{random foldername}\{random filename}.exe"
It adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random entry} = "%Application Data%\{random folder name}\{random filename}.exe"
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random entry} = "%Application Data%\{random folder name}\{random filename}.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\ELowcQ
HKEY_LOCAL_MACHINE\SOFTWARE\{random key}
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SecurityCenterServer{number}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\{random key}
License = "444"
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}-vaper.su
- http://{BLOCKED}.{BLOCKED}.92.230:8080
- http://{BLOCKED}.{BLOCKED}.228.220:443
SOLUTION
9.700
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
Scan your computer with your Trend Micro product and note files detected as TROJ_ZCLICK.GAV
Step 4
Restart in Safe Mode
Step 5
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
- SecurityCenterServer{number}
- SecurityCenterServer{number}
- In HKEY_LOCAL_MACHINE\SOFTWARE
- ELowcQ
- ELowcQ
- In HKEY_LOCAL_MACHINE\SOFTWARE
- {random key}
- {random key}
Step 6
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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {random entry} = "%Application Data%\{random folder name}\{random filename}.exe"
- {random entry} = "%Application Data%\{random folder name}\{random filename}.exe"
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {random entry} = "%Application Data%\{random folder name}\{random filename}.exe"
- {random entry} = "%Application Data%\{random folder name}\{random filename}.exe"
Step 7
Search and delete this file
- %System%\Tasks\Security Center Update - {number}.job
- %Windows%\Tasks\Security Center Update - {number}.job
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_ZCLICK.GAV. 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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