TSPY_ZBOT.SMAN
PWS:Win32/Simda.K (Microsoft); Generic PWS.y!1cv (McAfee); PAK:UPX (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Backdoor.Generic.691378 (FSecure)
Windows 2000, Windows XP, Windows Server 2003

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
266,240 bytes
EXE
Yes
16 May 2012
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:
- %Windows%\apppatch\vihdtm.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It creates the following folders:
- %User Profile%\Application Data\F5305ED
- %User Profile%\F5305ED\keys
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Autostart Technique
This spyware modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
userinit = "%System%\userinit.exe,%Windows%\apppatch\vihdtm.exe,"
(Note: The default value data of the said registry entry is %Windows%\system32\userinit.exe,.)
Other System Modifications
This spyware deletes the following files:
- %User Temp%\1.tmp
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
(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.. %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
f0bdff95 = "{random characters}"
Dropping Routine
This spyware drops the following files:
- %Windows%\apppatch\vihdtm.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
This report is generated via an automated analysis system.
SOLUTION
9.200
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
Identify and delete files detected as TSPY_ZBOT.SMAN using either the Startup Disk or Recovery Console
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\Winlogon
- f0bdff95 = "{random characters}"
Step 4
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,%Windows%\apppatch\vihdtm.exe,"
To: userinit = ""%Windows%\system32\userinit.exe,""
- From: userinit = "%System%\userinit.exe,%Windows%\apppatch\vihdtm.exe,"
Step 5
Search and delete this file
- %Windows%\apppatch\vihdtm.exe
Step 6
Search and delete these folders
- %User Profile%\Application Data\F5305ED
- %User Profile%\F5305ED\keys
Step 7
Scan your computer with your Trend Micro product to delete files detected as TSPY_ZBOT.SMAN. 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 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Temp%\1.tmp
- %Windows%\SoftwareDistribution\DataStore\Logs\edbtmp.log
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