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TROJ_DROPPE.KL

November 22, 2013
 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:

29,184 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

22 Nov 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:

  • %Windows%\{00D34~1.BAT

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

It adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}

HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\
DefaultIcon

HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\
Shell

HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\
Shell\Open

HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\
Shell\Open\Command

HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\
Shell\ÊôÐÔ(&R)

HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\
Shell\ÊôÐÔ(&R)\Command

HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\
ShellFolder

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Desktop\NameSpace\{00D34A52-5617-1D04-E5C5-BDB42573D472}

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\ShellFolder
Attributes = "a"

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_CLASSES_ROOT\CLSID
    • {00D34A52-5617-1D04-E5C5-BDB42573D472}
  • In HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}
    • DefaultIcon
  • In HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}
    • Shell
  • In HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\Shell
    • Open
  • In HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\Shell\Open
    • Command
  • In HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\Shell
    • ÊôÐÔ(&R)
  • In HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\Shell\ÊôÐÔ(&R)
    • Command
  • In HKEY_CLASSES_ROOT\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}
    • ShellFolder
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\CLSID
    • {00D34A52-5617-1D04-E5C5-BDB42573D472}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Desktop\NameSpace
    • {00D34A52-5617-1D04-E5C5-BDB42573D472}

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\Classes\CLSID\{00D34A52-5617-1D04-E5C5-BDB42573D472}\ShellFolder
    • Attributes = "a"

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPE.KL. 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 5

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.

  • %Windows%\{00D34~1.BAT


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