TSPY_ZBOT.EQB
PWS-Zbot.dx (McAfee); Trojan.Zbot (Symantec); Trojan.Win32.Jorik.Zbot.pwb (Kaspersky); ERROR (Sunbelt); Trojan horse Generic33.BMTU (AVG)
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\Odfe
- %User Profile%\Application Data\Kyyny
- %User Profile%\Application Data\Ugyfc
- %User Profile%\Application Data\Puugyv
- %User Temp%\sriotfg
- %User Temp%\sriotfg\ssxotvs
- %User Temp%\tmp6f5286c4
- %User Profile%\Application Data\Gauhduoq
(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.. %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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)
Autostart Technique
This spyware adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Gekipeighe = "%User Profile%\Puugyv\eqypyr.exe"
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Gekipeighe = "%User Profile%\Puugyv\eqypyr.exe"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Viqysuef = "%User Profile%\Gauhduoq\faquaw.exe"
Other System Modifications
This spyware deletes the following files:
- %System%\uxpanytal.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Fyuxly
HKEY_LOCAL_MACHINE\SOFTWARE\AVygrA
HKEY_CURRENT_USER\SOFTWARE\AVygrA
HKEY_CURRENT_USER\software\classes\
clsid
HKEY_CURRENT_USER\clsid\{fbeb8a05-beee-4442-804e-409d6c4515e9}\
inprocserver32
It adds the following registry entries:
HKEY_LOCAL_MACHINE\SOFTWARE\AVygrA
License = "39"
HKEY_CURRENT_USER\Software\AVygrA
License = "39"
It modifies the following registry entries:
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Session Manager\SubSystems
Windows = "{random characters}"
(Note: The default value data of the said registry entry is {random values}.)
Dropping Routine
This spyware drops the following files:
- %User Temp%\hojilcnm.exe
- %User Temp%\fehojilc.exe
- %User Temp%\kfehojil.exe
- %User Profile%\Odfe\ruah.exe
- %User Profile%\Kyyny\xycy.gid
- %User Profile%\Ugyfc\xiol.kul
- %User Profile%\Puugyv\eqypyr.exe
- %Windows%\Tasks\Security Center Update - 4146201781.job
- %User Temp%\tmp6f5286c4.exe
- %User Profile%\Gauhduoq\faquaw.exe
- %Windows%\Tasks\Security Center Update - 3043908180.job
- %System%\uxpanytal.exe
- %User Temp%\sriotfg\ssxotvs\wow.dll
- %System%\ofxie.exe
(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, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %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.. %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
Other Details
This spyware connects to the following possibly malicious URL:
- http://{BLOCKED}dsddfghjgf.com/b/opt/D9187ABFA92BADA737CD4D4F
- http://{BLOCKED}dsddfghjgf.com/b/plum/B2771AE6886789A7D9ACC3156BDBDD103A109C3C
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
- Fyuxly
- In HKEY_LOCAL_MACHINE\SOFTWARE
- AVygrA
- In HKEY_CURRENT_USER\SOFTWARE
- AVygrA
- In HKEY_CURRENT_USER\software\classes
- clsid
- In HKEY_CURRENT_USER\clsid\{fbeb8a05-beee-4442-804e-409d6c4515e9}
- inprocserver32
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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Gekipeighe = "%User Profile%\Puugyv\eqypyr.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- Gekipeighe = "%User Profile%\Puugyv\eqypyr.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
- Viqysuef = "%User Profile%\Gauhduoq\faquaw.exe"
- In HKEY_LOCAL_MACHINE\SOFTWARE\AVygrA
- License = "39"
- In HKEY_CURRENT_USER\Software\AVygrA
- License = "39"
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\SYSTEM\ControlSet001\Control\Session Manager\SubSystems
- From: Windows = "{random characters}"
To: Windows = ""{random values}""
- From: Windows = "{random characters}"
Step 6
Search and delete these components
- %User Temp%\hojilcnm.exe
- %User Temp%\fehojilc.exe
- %User Temp%\kfehojil.exe
- %User Profile%\Odfe\ruah.exe
- %User Profile%\Kyyny\xycy.gid
- %User Profile%\Ugyfc\xiol.kul
- %User Profile%\Puugyv\eqypyr.exe
- %Windows%\Tasks\Security Center Update - 4146201781.job
- %User Temp%\tmp6f5286c4.exe
- %User Profile%\Gauhduoq\faquaw.exe
- %Windows%\Tasks\Security Center Update - 3043908180.job
- %System%\uxpanytal.exe
- %User Temp%\sriotfg\ssxotvs\wow.dll
- %System%\ofxie.exe
Step 7
Search and delete these folders
- %User Profile%\Application Data\Odfe
- %User Profile%\Application Data\Kyyny
- %User Profile%\Application Data\Ugyfc
- %User Profile%\Application Data\Puugyv
- %User Temp%\sriotfg
- %User Temp%\sriotfg\ssxotvs
- %User Temp%\tmp6f5286c4
- %User Profile%\Application Data\Gauhduoq
Step 8
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.EQB. 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 9
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.
- %System%\uxpanytal.exe
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