Analysis by: Cris Nowell Pantanilla
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  TECHNICAL DETAILS

File Size: 69,632 bytes
File Type: EXE
Memory Resident: Yes
Initial Samples Received Date: 18 Apr 2012

Installation

This worm drops the following copies of itself into the affected system:

  • %Windows%\Dnmee33.exe

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Autostart Technique

This worm registers itself as a system service to ensure its automatic execution at every system startup by adding the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\RunServices
Windows Updt Maschishkha = "Dnmee33.exe"

It adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
Windows Updt Maschishkha = "Dnmee33.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
Windows Updt Maschishkha = "Dnmee33.exe"

Other System Modifications

This worm adds the following registry entries:

HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\
Control\Lsa
Windows Updt Maschishkha = "Dnmee33.exe"

HKEY_CURRENT_USER\Software\Microsoft\
OLE
Windows Updt Maschishkha = "Dnmee33.exe"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Ole
Windows Updt Maschishkha = "Dnmee33.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Control\Lsa
Windows Updt Maschishkha = "Dnmee33.exe"

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parameters\
FirewallPolicy\StandardProfile\AuthorizedApplications\
List
%Windows%\Dnmee33.exe = "%Windows%\Dnmee33.exe:*:Enabled:Windows Updt Maschishkha"

Other Details

This worm connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.205.179

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.920.04
FIRST VSAPI PATTERN DATE: 18 Apr 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Restart in Safe Mode

[ Learn More ]

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • Windows Updt Maschishkha = "Dnmee33.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
    • Windows Updt Maschishkha = "Dnmee33.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
    • Windows Updt Maschishkha = "Dnmee33.exe"
  • In HKEY_CURRENT_USER\SYSTEM\CurrentControlSet\Control\Lsa
    • Windows Updt Maschishkha = "Dnmee33.exe"
  • In HKEY_CURRENT_USER\Software\Microsoft\OLE
    • Windows Updt Maschishkha = "Dnmee33.exe"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole
    • Windows Updt Maschishkha = "Dnmee33.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
    • Windows Updt Maschishkha = "Dnmee33.exe"
  • In HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\AuthorizedApplications\List
    • %Windows%\Dnmee33.exe = "%Windows%\Dnmee33.exe:*:Enabled:Windows Updt Maschishkha"

Step 4

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