TROJ_ZBOT.SMUB
Worm:Win32/Vobfus (Microsoft); PWS-Zbot.gen.fb (McAfee); Trojan.Win32.Buzus.ixxj (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.KDV.177861 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
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
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_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
MSWUpdate = ""%User Profile%\Application Data\services.exe""
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
MSWUpdate = ""%User Profile%\Application Data\services.exe""
It modifies the following registry entries to ensure it automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = "Explorer.exe "%User Profile%\Application Data\services.exe""
(Note: The default value data of the said registry entry is Explorer.exe.)
Other System Modifications
This Trojan deletes the following files:
- %Temp%\scs1.tmp
- %Temp%\scs2.tmp
(Note: %Temp% is the Windows Temporary folder, which is usually C:\Windows\Temp.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
Micronsoft\addIns
HKEY_CURRENT_USER\Software\Microsoft\
Visual Basic\6.0
It adds the following registry entries:
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
Micronsoft\addIns
Proc = "ùn_CHAR(0x1E)_À_CHAR(0x03)_måNB??6"
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
Micronsoft\addIns
LOC = "z_CHAR(0x06)_?§?Ý¡Ï
¡Ú²"
HKEY_CURRENT_USER\Software\VB and VBA Program Settings\
Micronsoft\addIns
FS = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%User Profile%\Application Data\services.exe = "%User Profile%\Application Data\services.exe:*:Enabled:CityScape"
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\qpaRuQEK
(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://www.{BLOCKED}d.com/app/locate_my_ip
This report is generated via an automated analysis system.
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
Identify and delete files detected as TROJ_ZBOT.SMUB using either the Startup Disk or Recovery Console
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\VB and VBA Program Settings\Micronsoft
- addIns
- In HKEY_CURRENT_USER\Software\Microsoft\Visual Basic
- 6.0
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
- MSWUpdate=""%User Profile%\Application Data\services.exe""
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- MSWUpdate=""%User Profile%\Application Data\services.exe""
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\Micronsoft\addIns
- Proc="ùn_CHAR(0x1E)_À_CHAR(0x03)_måNB??6"
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\Micronsoft\addIns
- LOC="z_CHAR(0x06)_?§?Ý¡Ï ¡Ú²"
- In HKEY_CURRENT_USER\Software\VB and VBA Program Settings\Micronsoft\addIns
- FS="1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
- %User Profile%\Application Data\services.exe="%User Profile%\Application Data\services.exe:*:Enabled:CityScape"
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\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Shell="Explorer.exe "%User Profile%\Application Data\services.exe""
To: Shell=Explorer.exe
- From: Shell="Explorer.exe "%User Profile%\Application Data\services.exe""
Step 6
Search and delete this file
Step 7
Scan your computer with your Trend Micro product to delete files detected as TROJ_ZBOT.SMUB. 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.
- %Temp%\scs1.tmp
- %Temp%\scs2.tmp
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