TROJ_KILLAV.AUQ
RiskTool.Win32.Deleter.i (Kaspersky); Found Win32/DH{IA9MLiIjJWQANjU} (AVG)
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
1,053,184 bytes
EXE
Yes
06 Jun 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 adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{malware file name} = "{malware path and file name}"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunOnce
Cleanup = "%System Root%\cleanup.exe"
It 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\ijqljcq
Other System Modifications
This Trojan adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ijqljcq
ImagePath = "system32\drivers\pxvii.sys"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ijqljcq
Start = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ijqljcq
Type = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ijqljcq
ErrorControl = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ijqljcq
yyeunhxz = "\??\%Program Files%\exzgrn.txt"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ijqljcq
zabqttjc = "%Windows%"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ijqljcq
jgrod = "bab"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\ijqljcq
Group = "focd"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\ServiceGroupOrder
List = "{random characters}"
(Note: The default value data of the said registry entry is {random values}.)
Dropping Routine
This Trojan drops the following files:
- %System Root%\Flash.exe
- %System Root%\Plg.txt
- %Program Files%\exzgrn.txt
- %System%\drivers\pxvii.sys
- %System Root%\zip.exe
- %System Root%\cleanup.bat
- %System Root%\cleanup.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %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).. %System% is the Windows system folder, which is usually C:\Windows\System32.)
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
- ijqljcq
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\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- {malware file name} = "{malware path and file name}"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce
- Cleanup = "%System Root%\cleanup.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
- EnableLUA = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ijqljcq
- ImagePath = "system32\drivers\pxvii.sys"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ijqljcq
- Start = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ijqljcq
- Type = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ijqljcq
- ErrorControl = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ijqljcq
- yyeunhxz = "\??\%Program Files%\exzgrn.txt"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ijqljcq
- zabqttjc = "%Windows%"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ijqljcq
- jgrod = "bab"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\ijqljcq
- Group = "focd"
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\SYSTEM\ControlSet001\Control\ServiceGroupOrder
- From: List = "{random characters}"
To: List = ""{random values}""
- From: List = "{random characters}"
Step 6
Search and delete these components
- %System Root%\Flash.exe
- %System Root%\Plg.txt
- %Program Files%\exzgrn.txt
- %System%\drivers\pxvii.sys
- %System Root%\zip.exe
- %System Root%\cleanup.bat
- %System Root%\cleanup.exe
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_KILLAV.AUQ. 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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