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TROJ_DROPPR.CPB

October 08, 2012
 Analysis by: Michael Cabel
 ALIASES:

Symantec: Trojan.ADH

 PLATFORM:

Windows 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW


This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be unknowingly downloaded by a user while visiting malicious websites. It may be manually installed by a user.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

3,615,515 bytes

Memory Resident:

No

Initial Samples Received Date:

17 Feb 2011

Payload:

Connects to URLs/Ips

Arrival Details

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

It may be unknowingly downloaded by a user while visiting malicious websites.

It may be manually installed by a user.

Installation

This Trojan drops the following component file(s):

  • %Program Files%\Seraph\ksp.sys - detected as TROJ_BUMAT.BEX
  • %Program Files%\Seraph\ksp3.sys - detected as TROJ_BUMAT.BEX

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files.)

It creates the following folders:

  • %Start Menu%\Programs\Seraph
  • %Program Files%\Seraph

(Note: %Start Menu% is the current user's Start Menu folder, which is usually C:\Windows\Profiles\{user name}\Start Menu on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Start Menu on Windows NT and C:\Windows\Start Menu or C:\Documents and Settings\{User name}\Start Menu on Windows 2000, XP, and Server 2003.. %Program Files% is the default Program Files folder, usually C:\Program Files.)

Other System Modifications

This Trojan adds the following registry keys as part of its installation routine:

HKEY_CLASSES_ROOT\.Sel

HKEY_CLASSES_ROOT\.Ser

HKEY_CLASSES_ROOT\.Spk

HKEY_CLASSES_ROOT\.Spkx

HKEY_CLASSES_ROOT\SeraphSelFile

HKEY_CLASSES_ROOT\SeraphSerFile

HKEY_CLASSES_ROOT\SeraphSpkFile

HKEY_CLASSES_ROOT\SeraphSpkxFile

HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications\
Seraph

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.Sel

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.Ser

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.Spk

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
.Spkx

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SeraphSelFile

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SeraphSerFile

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SeraphSpkFile

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SeraphSpkxFile

HHKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
Seraph_is1

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://www.{BLOCKED}h.com.tw/logo.asp
  • http://www.{BLOCKED}zone.com/ver_tw.txt

However, as of this writing, the said sites are inaccessible.

  SOLUTION

Minimum Scan Engine:

8.900

VSAPI PATTERN File:

7.842.04

VSAPI PATTERN Date:

17 Feb 2011

VSAPI PATTERN Date:

2/17/2011 12:00:00 AM

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

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
    • .Sel
  • In HKEY_CLASSES_ROOT
    • .Ser
  • In HKEY_CLASSES_ROOT
    • .Spk
  • In HKEY_CLASSES_ROOT
    • .Spkx
  • In HKEY_CLASSES_ROOT
    • SeraphSelFile
  • In HKEY_CLASSES_ROOT
    • SeraphSerFile
  • In HKEY_CLASSES_ROOT
    • SeraphSpkFile
  • In HKEY_CLASSES_ROOT
    • SeraphSpkxFile
  • In HKEY_CURRENT_USER\Software\Local AppWizard-Generated Applications
    • Seraph
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .Sel
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .Ser
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .Spk
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • .Spkx
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • SeraphSelFile
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • SeraphSerFile
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • SeraphSpkFile
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • SeraphSpkxFile
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • Seraph_is

Step 3

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. %Start Menu%\Programs\Seraph
%Program Files%\Seraph

Step 4

Scan your computer with your Trend Micro product to delete files detected as TROJ_DROPPR.CPB. 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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