TSPY_ZBOT.PNM
PWS:Win32/Zbot (Microsoft), TR/PSW.Zbot.JC.1 (Antivir), W32/Luder.AYZB!tr (Fortinet), Win32/Spy.Zbot.AAU trojan (ESET)
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: Spyware
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This spyware arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
487,510 bytes
EXE
Yes
27 May 2013
Arrival Details
This spyware arrives as an attachment to email messages spammed by other malware/grayware or malicious users.
Installation
This spyware drops the following copies of itself into the affected system and executes them:
- %Application Data%\{random folder}\{random file name}.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.)
It drops the following files:
- %Application Data%\Microsoft\Address Book\{user name}.wab
(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.)
It creates the following folders:
- %Application Data%\{random folder}
- %Application Data%\Microsoft\Address Book
(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.)
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} = "%Application Data%\{random folder}\{random file name}.exe"
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
{11 random letters}
HKEY_CURRENT_USER\Software\Microsoft\
WAB
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4\Wab File Name
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
{random}
{11 random letters} = "{random characters}"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkContactRefresh = "0"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkFolderRefresh = "0"
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4\Wab File Name
(Default) = "%Application Data%\Microsoft\Address Book\{user name}.wab"
It creates the following registry entry(ies) to bypass Windows Firewall:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
{random 5-digit port number 1}:UDP = "{random 5-digit port number 1}:UDP:*:Enabled:UDP {random 5-digit port number 1}"
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
{random 5-digit port number 2}:TCP = "{random 5-digit port number 1}:TCP:*:Enabled:TCP {random 5-digit port number 2}"
Other Details
This spyware deletes the initially executed copy of itself
NOTES:
This spyware connects to randomly generated IP addresses.
SOLUTION
9.300
9.944.03
27 May 2013
9.945.00
28 May 2013
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_CURRENT_USER\Software\Microsoft
- {11 random letters}
- {11 random letters}
- In HKEY_CURRENT_USER\Software\Microsoft
- WAB
- WAB
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} = "%Application Data%\{random folder}\{random file name}.exe"
- {random file name} = "%Application Data%\{random folder}\{random file name}.exe"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- {random 5-digit port number 1}:UDP = "{random 5-digit port number 1}:UDP:*:Enabled:UDP {random 5-digit port number 1}"
- {random 5-digit port number 1}:UDP = "{random 5-digit port number 1}:UDP:*:Enabled:UDP {random 5-digit port number 1}"
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- {random 5-digit port number 2}:TCP = "{random 5-digit port number 2}:TCP:*:Enabled:TCP {random 5-digit port number 2}"
- {random 5-digit port number 2}:TCP = "{random 5-digit port number 2}:TCP:*:Enabled:TCP {random 5-digit port number 2}"
Step 5
Search and delete these folders
- %Application Data%\{random folder}
- %Application Data%\Microsoft\Address Book
Step 6
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.PNM. 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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