TSPY_ZBOT.EQB


 ALIASES:

PWS-Zbot.dx (McAfee); Trojan.Zbot (Symantec); Trojan.Win32.Jorik.Zbot.pwb (Kaspersky); ERROR (Sunbelt); Trojan horse Generic33.BMTU (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 INFORMATION EXPOSURE:

  • 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

File Size:

636,928 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 Jul 2013

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

Minimum Scan Engine:

9.300

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

[ Learn More ]

Step 3

Delete this registry key

[ Learn More ]

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

[ Learn More ]

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

[ Learn More ]

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}""

Step 6

Search and delete these components

[ Learn More ]
There may be some components that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
  • %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

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %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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