ALIASES:

Worm:Win32/Vundo.B (Microsoft); Vundo.gen.ab (McAfee); Packed.Vuntid!gen1 (Symantec); Trojan.Win32.Monder.nzqm (Kaspersky); Packed.Win32.Vundo.b (v) (Sunbelt); Trojan horse Vundo.ME (AVG)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • 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

File Size: 55,808 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 04 Jun 2013

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.

Other System Modifications

This Trojan deletes the following files:

  • %System%\femigegi.dll
  • %System%\sobipore.dll
  • %System%\hafurive.dll
  • %System%\diguweha.dll
  • %System%\mrt.exe

(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)

It adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\wewubewa

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
wewubewa

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\wewubewa
jozatiku = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\wewubewa
nezetuji = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\wewubewa
finafame = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
wewubewa
papojibo = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Windows
LoadAppInit_DLLs = "1"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Windows%\explorer.exe = "%Windows%\explorer.exe:*:Enabled:Explorer"

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Windows
AppInit_DLLs = "kiyivaro.dll"

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\
Control\Lsa
Notification Packages = "scecli,tuduriro.dll"

(Note: The default value data of the said registry entry is {random values}.)

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Security Center
UpdatesDisableNotify = "1"

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

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_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
    • wewubewa
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft
    • wewubewa

Step 3

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\wewubewa
    • jozatiku = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\wewubewa
    • nezetuji = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\wewubewa
    • finafame = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\wewubewa
    • papojibo = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows
    • LoadAppInit_DLLs = "1"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Windows%\explorer.exe = "%Windows%\explorer.exe:*:Enabled:Explorer"

Step 4

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\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Windows
    • AppInit_DLLs = "kiyivaro.dll"
  • In HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Lsa
    • From: Notification Packages = "scecli,tuduriro.dll"
      To: Notification Packages = ""{random values}""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Security Center
    • UpdatesDisableNotify = "1"

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_VUNDO.SMAF. 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 6

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%\femigegi.dll
  • %System%\sobipore.dll
  • %System%\hafurive.dll
  • %System%\diguweha.dll
  • %System%\mrt.exe


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