TROJ_ZCLICK.LPJ
Trojan-Spy.Win32.Zbot.tngm (Kaspersky), PWS:Win32/Zbot (Microsoft), Trojan.FakeAV (Symmantec), PWSZbot-FAAV!E2E918A39977 (Mcafee), Trojan.Win32.Generic!BT (Sunbelt), TR/Crypt.XPACK.Gen (Antivir), Trojan.Zbot.Agent.E (Bitdefender), Trojan-Spy.Win32.Zbot (Ikarus), Win32/Spy.Zbot.ABA trojan (Esset), TrojanSpy.Zbot (Vba32)
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Threat Type: Trojan
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
Downloaded from the Internet, Dropped by other malware
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 does not have any propagation routine.
It does not have any backdoor routine.
TECHNICAL DETAILS
429,238 bytes
EXE
Yes
07 Aug 2014
Connects to URLs/IPs
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:
- %Application Data%\{random foldername}\{random filename 1}.exe
- %System%\{random filename 2}.exe
(Note: %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.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
It drops the following files:
- %Windows%\Tasks\Security Center Update - {number}.job
(Note: %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 1}.exe""
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SecurityCenterServer{number}
DisplayName = "Security Center Server - {number}"
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 1}.exe"
HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{random entry} = "%Application Data%\{random folder name}\{random filename 1}.exe"
Other System Modifications
This Trojan adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SecurityCenterServer{number}
Propagation
This Trojan does not have any propagation routine.
Backdoor Routine
This Trojan does not have any backdoor routine.
NOTES:
This malware connects to the following URL(s) to get its configuration file that will be loaded in memory:
- http://{BLOCKED}-vaper.su/b/opt/{hash}
However, as of this writing, the said sites are inaccessible.
This configuration file may contain the following:
- Search URL (referrer url)
- Update URL (new C&C)
- Click URL (redirection url source)
- Mutex Name
- Flash URL
The data in the configuration files may be used for its pay-per-click scheme. It may do so by displaying a full screen window with loaded URLs and performing various mouse movements and scrolling when this window is active.
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
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_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services
- SecurityCenterServer{number}
- SecurityCenterServer{number}
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {random entry} = "%Application Data%\{random folder name}\{random filename 1}.exe"
- {random entry} = "%Application Data%\{random folder name}\{random filename 1}.exe"
- In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {random entry} = "%Application Data%\{random folder name}\{random filename 1}.exe"
- {random entry} = "%Application Data%\{random folder name}\{random filename 1}.exe"
Step 6
Search and delete this file
- %Windows%\Tasks\Security Center Update - {number}.job
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_ZCLICK.LPJ. 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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