TSPY_ZBOT.YUYEL
Trojan-Spy.Win32.Zbot.tbuo (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: Spyware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This spyware 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
Arrival Details
This spyware 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 spyware drops the following copies of itself into the affected system and executes them:
- %User Temp%\{random folder}\{random file name}.exe
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
It drops the following files:
- %System%\drivers\{16 alphanumeric characters}.sys
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It creates the following folders:
- %User Temp%\{random folder}
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Autostart Technique
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random file name} = "%User Temp%\{random folder}\{random file name}.exe"
Other System Modifications
This spyware adds the following registry keys:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
HKEY_CURRENT_USER\Software\{random}
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
ImagePath = "\SystemRoot\System32\Drivers\{16 alphanumeric characters}.sys"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
Group = "Boot Bus Extender"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
ErrorControl = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
Type = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
Start = "0"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
Tag = "1"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
DisplayName = "{malware file name}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
DB6 = {hex value}
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\{16 alphanumeric characters}
DB5 = {hex value}
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
{random port}:TCP = "{random port}:TCP:*:Enabled:TCP {random port}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
{random port}:UDP = "{random port}:UDP:*:Enabled:UDP {random port}"
SOLUTION
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
Scan your computer with your Trend Micro product and note files detected as TSPY_ZBOT.YUYEL
Step 3
Restart in Safe Mode
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {random file name} = "%User Temp%\{random folder}\{random file name}.exe"
- {random file name} = "%User Temp%\{random folder}\{random file name}.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- {random port}:TCP = "{random port}:TCP:*:Enabled:TCP {random port}"
- {random port}:TCP = "{random port}:TCP:*:Enabled:TCP {random port}"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- {random port}:UDP = "{random port}:UDP:*:Enabled:UDP {random port}"
- {random port}:UDP = "{random port}:UDP:*:Enabled:UDP {random port}"
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
- {16 alphanumeric characters}
- {16 alphanumeric characters}
- In HKEY_CURRENT_USER\Software
- {random}
- {random}
Step 6
Search and delete these folders
- %User Temp%\{random folder}
Step 7
Search and delete this file
- %System%\drivers\{16 alphanumeric characters}.sys
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.YUYEL. 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 9
The following created registry key(s) cannot be identified by the user since there are no reference values in the created key. The only way it can be identified is by comparing the present keys with a backup of the system registry. Note that the said key(s) do not have to be deleted since it won't be harmful to the system:
- HKEY_CURRENT_USER\Software\{random}
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