TSPY_ZBOT.MLJ
PWS:Win32/Zbot.gen!AL (Microsoft); PWS-Zbot.gen.aua (McAfee); Trojan-Spy.Win32.Zbot.igxu (Kaspersky)
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
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 creates the following folders:
- %User Profile%\Application Data\Gyhuar
(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.)
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
{58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Gyhuar\oqca.exe"
Other System Modifications
This spyware adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Inal
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = "4"
HKEY_CURRENT_USER\Software\Microsoft\
Inal
28g6hcdg = "sNR+6W6nyduqvxDQdcUanQ==?_CHAR(0x07)_?"
HKEY_CURRENT_USER\Software\Microsoft\
Inal
243ddcca = "ydQQ6Q==?"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
27616:UDP = "27616:UDP:*:Enabled:UDP 27616"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "0"
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
29261:TCP = "29261:TCP:*:Enabled:TCP 29261"
HKEY_CURRENT_USER\Software\Microsoft\
Inal
7ai4he6 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Inal
1fdbhg87 = "{random values}"
HKEY_CURRENT_USER\Software\Microsoft\
Inal
2b16d2cf = "{random characters}"
HKEY_CURRENT_USER\Software\Microsoft\
Inal
243ddcca = "yNQQ6Q==Ø_CHAR(0x03)_?ã?ã?ã?? "
Dropping Routine
This spyware drops the following files:
- %User Profile%\Application Data\Gyhuar
- %User Profile%\Gyhuar\oqca.exe
- %Application Data%\zeacfa.usy
(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.. %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.)
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
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
- Inal
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
- {58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Gyhuar\oqca.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
- Server ID = "4"
- In HKEY_CURRENT_USER\Software\Microsoft\Inal
- 28g6hcdg = "sNR+6W6nyduqvxDQdcUanQ==?_CHAR(0x07)_?"
- In HKEY_CURRENT_USER\Software\Microsoft\Inal
- 243ddcca = "ydQQ6Q==?"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "1"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- 27616:UDP = "27616:UDP:*:Enabled:UDP 27616"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile
- DisableNotifications = "0"
- In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\GloballyOpenPorts\List
- 29261:TCP = "29261:TCP:*:Enabled:TCP 29261"
- In HKEY_CURRENT_USER\Software\Microsoft\Inal
- 7ai4he6 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Inal
- 1fdbhg87 = "{random values}"
- In HKEY_CURRENT_USER\Software\Microsoft\Inal
- 2b16d2cf = "{random characters}"
- In HKEY_CURRENT_USER\Software\Microsoft\Inal
- 243ddcca = "yNQQ6Q==Ø_CHAR(0x03)_?ã?ã?ã?? "
Step 5
Search and delete these components
- %User Profile%\Application Data\Gyhuar
- %User Profile%\Gyhuar\oqca.exe
- %Application Data%\zeacfa.usy
Step 6
Search and delete this folder
- %User Profile%\Application Data\Gyhuar
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.MLJ. 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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