TSPY_ZBOT.TAF
Windows 98, ME, NT, 2000, XP, Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan may be dropped by other malware. It may be unknowingly downloaded by a user while visiting malicious websites. However, as of this writing, the said sites are inaccessible.
It attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data.
TECHNICAL DETAILS
Arrival Details
This Trojan may be dropped by other malware.
It may be unknowingly downloaded by a user while visiting malicious websites.
However, as of this writing, the said sites are inaccessible.
Installation
This Trojan adds the following folders:
- %System%\lowsec
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It drops the following files:
- %System%\lowsec\sdra64.exe - copy of itself
- %System%\lowsec\local.ds - copy of the encrypted downloaded file
- %System%\lowsec\user.ds - used to save the gathered information
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It is injected into the following processes running in memory:
- SVCHOST.EXE
- WINLOGON.EXE
Autostart Technique
This Trojan modifies the following registry entry(ies) to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = %System%\userinit.exe, %System%\sdra64.exe,
(Note: The default value data of the said registry entry is %System%\userinit.exe,.)
Other System Modifications
This Trojan adds the following registry entries as part of its installation routine:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Network
UID = {Computer name}_{Random numbers}
HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Explorer\{19127AD2-394B-70F5-C650-B97867BAA1F7}
"" = ""
HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Explorer\{43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}
"" = ""
HKEY_USERS\.DEFAULT\Software\
Microsoft\Windows\CurrentVersion\
Explorer\{4B19E1F3-5B47-C615-C75A-E0FD63DB477F}
"" = ""
HKEY_USERS\.DEFAULT\Software\
Microsoft\Protected Storage System Provider
"" = ""
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
EnableFirewall = 0
Information Theft
This Trojan attempts to steal sensitive online banking information, such as user names and passwords. This routine risks the exposure of the user's account information, which may then lead to the unauthorized use of the stolen data.
It accesses the following site to download its configuration file:
- http://joysmovie.org/sda/66/cfg.bin
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restore this modified 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 NT\CurrentVersion\Winlogon
- From: Userinit =%System%\userinit.exe, %System%\sdra64.exe,
To: %System%\userinit.exe,
- From: Userinit =%System%\userinit.exe, %System%\sdra64.exe,
Step 3
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 NT\CurrentVersion\Network
- UID ={Computer name}_{Random numbers}
- UID ={Computer name}_{Random numbers}
- In HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\
- {19127AD2-394B-70F5-C650-B97867BAA1F7}
- {19127AD2-394B-70F5-C650-B97867BAA1F7}
- In HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\
- {43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}
- {43BF8CD1-C5D5-2230-7BB2-98F22C2B7DC6}
- In HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\
- {4B19E1F3-5B47-C615-C75A-E0FD63DB477F}
- {4B19E1F3-5B47-C615-C75A-E0FD63DB477F}
- In HKEY_USERS\.DEFAULT\Software\Microsoft\
- Protected Storage System Provider
- Protected Storage System Provider
- In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- EnableFirewall=0
- EnableFirewall=0
Step 4
Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.TAF. 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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