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TSPY_ZBOT.AKO

May 03, 2013
 ALIASES:

Trojan:Win32/Bumat!rts (Microsoft); RDN/PWS-Zbot.apr!d (McAfee); Trojan.Zbot (Symantec); Trojan-Spy.Win32.Zbot.kulh (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Generic32.CAJJ (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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

233,472 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

02 May 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\Vaikvo

(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%\Vaikvo\ejqaep.exe"

Other System Modifications

This spyware adds the following registry keys:

HKEY_CURRENT_USER\Software\Microsoft\
Oxun

It adds the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
2f06ah1h = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
2b4b390b = "5ba6457"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
2b4b390b = "{random values}"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
29571:UDP = "29571:UDP:*:Enabled:UDP 29571"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile
DisableNotifications = "0"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\GloballyOpenPorts\
List
28150:TCP = "28150:TCP:*:Enabled:TCP 28150"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
1b4h76i7 = "xHemWw62L4v8bQnc?_CHAR(0x05)_."

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
2jf63006 = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
246i3fge = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
246i3fge = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
2jf63006 = "{random characters}"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
2c9aecdj = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
15ec1i64 = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
2h62b495 = "{random values}"

HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = "4"

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
FirstRun = "1"

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkContactRefresh = "0"

HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
OlkFolderRefresh = "0"

HKEY_CURRENT_USER\Software\Microsoft\
Oxun
2b4b390b = "5ba6416"

It modifies the following registry entries:

HKEY_CURRENT_USER\Identities
Last Username = "Main Identity"

(Note: The default value data of the said registry entry is Main Identity.)

HKEY_CURRENT_USER\Identities
Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"

(Note: The default value data of the said registry entry is {C0FE0177-5693-4537-9331-A7402AD82D40}.)

HKEY_CURRENT_USER\Identities
Identity Login = "9853"

(Note: The default value data of the said registry entry is 98053.)

HKEY_CURRENT_USER\Identities
Identity Ordinal = "2"

(Note: The default value data of the said registry entry is 1.)

Dropping Routine

This spyware drops the following files:

  • %User Profile%\Application Data\Vaikvo
  • %User Profile%\Vaikvo\ejqaep.exe
  • %Application Data%\vyujp.yqi

(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.)

Other Details

This spyware deletes itself after execution.

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
    • Oxun

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • {58C4EBA0-47A8-AD40-8C85-A85A94978B48} = "%User Profile%\Vaikvo\ejqaep.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 2f06ah1h = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 2b4b390b = "5ba6457"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 2b4b390b = "{random values}"
  • 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
    • 29571:UDP = "29571:UDP:*:Enabled:UDP 29571"
  • 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
    • 28150:TCP = "28150:TCP:*:Enabled:TCP 28150"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 1b4h76i7 = "xHemWw62L4v8bQnc?_CHAR(0x05)_."
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 2jf63006 = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 246i3fge = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 246i3fge = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 2jf63006 = "{random characters}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 2c9aecdj = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 15ec1i64 = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 2h62b495 = "{random values}"
  • In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
    • Server ID = "4"
  • In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
    • FirstRun = "1"
  • In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
    • OlkContactRefresh = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
    • OlkFolderRefresh = "0"
  • In HKEY_CURRENT_USER\Software\Microsoft\Oxun
    • 2b4b390b = "5ba6416"

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_CURRENT_USER\Identities
    • From: Last Username = "Main Identity"
      To: Last Username = ""Main Identity""
  • In HKEY_CURRENT_USER\Identities
    • From: Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"
      To: Last User ID = ""{C0FE0177-5693-4537-9331-A7402AD82D40}""
  • In HKEY_CURRENT_USER\Identities
    • From: Identity Login = "9853"
      To: Identity Login = ""98053""
  • In HKEY_CURRENT_USER\Identities
    • From: Identity Ordinal = "2"
      To: Identity Ordinal = ""1""

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 Profile%\Application Data\Vaikvo
  • %User Profile%\Vaikvo\ejqaep.exe
  • %Application Data%\vyujp.yqi

Step 7

Search and delete this folder

[ 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\Vaikvo

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as TSPY_ZBOT.AKO. 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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