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TROJ_PHIRES.C

April 24, 2013
 Analysis by: Christopher Talampas
 ALIASES:

Trojan:Win32/Startpage.SY, Trojan:Win32/Dynamer!dtc, Trojan:Win32/Danginex (Microsoft), Trojan-Banker.Win32.Banbra, Trojan.Win32.VB, Hoax.Win32.BadJoke, Hoax.Win32.BadJoke (Ikarus)

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

 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:

1,302,656 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

08 Aug 2012

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.

Installation

This Trojan drops the following files:

  • %Desktop%\{Random}.lnk
  • %User Temp%\silentOverwrite
  • %User Temp%\Baidu-Toolbar.exe
  • %User Temp%\ljm.exe
  • %User Temp%\cf.exe
  • %User Temp%\SeFastInstall.exe
  • %User Temp%\tb.exe
  • %User Temp%\nsf{random digit}.tmp

(Note: %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\Desktop on Windows Vista and 7.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

Other System Modifications

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\.lllll

HKEY_CLASSES_ROOT\BaiduBar.Tool

HKEY_CLASSES_ROOT\BaiduBarEx.BDHomePage

HKEY_CLASSES_ROOT\BaiduBarX.BandIE

HKEY_CLASSES_ROOT\BaiduBarX.BandIE.1

HKEY_CLASSES_ROOT\BaiduBarX.ToolBand

HKEY_CLASSES_ROOT\BaiduBarX.ToolBand.1

HKEY_CLASSES_ROOT\BarBroker.BDBroker

HKEY_CLASSES_ROOT\nnnnnnn

HKEY_CLASSES_ROOT\AppID\BarBroker.EXE

HKEY_CLASSES_ROOT\AppID\{7A33CE9E-4F33-4B4E-B263-6AEEAB6C3DC2}

HKEY_CLASSES_ROOT\CLSID\{Random Digits1}

HKEY_CLASSES_ROOT\Interface\{Random Digits2}

HKEY_CLASSES_ROOT\TypeLib\{Random Digits3}

HKEY_LOCAL_MACHINE\SOFTWARE\Baidu

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
nnnnnnn

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
AppID\{7A33CE9E-4F33-4B4E-B263-6AEEAB6C3DC2}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{Random Digits4}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
Interface\{Random Digits5}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Internet Explorer\Low Rights

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
BaiduBarX

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}o.{BLOCKED}r.net/

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.872.09

FIRST VSAPI PATTERN DATE:

22 Apr 2013

VSAPI OPR PATTERN File:

9.873.00

VSAPI OPR PATTERN Date:

23 Apr 2013

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_CLASSES_ROOT\.lllll
    • HKEY_CLASSES_ROOT\BaiduBar.Tool
  • In HKEY_CLASSES_ROOT\BaiduBarEx.BDHomePage
    • HKEY_CLASSES_ROOT\BaiduBarX.BandIE
  • In HKEY_CLASSES_ROOT\BaiduBarX.BandIE.1
    • HKEY_CLASSES_ROOT\BaiduBarX.ToolBand
  • In HKEY_CLASSES_ROOT\BaiduBarX.ToolBand.1
    • HKEY_CLASSES_ROOT\BarBroker.BDBroker
  • In HKEY_CLASSES_ROOT\nnnnnnn
    • HKEY_CLASSES_ROOT\AppID\BarBroker.EXE
  • In HKEY_CLASSES_ROOT\AppID\{7A33CE9E-4F33-4B4E-B263-6AEEAB6C3DC2}
    • HKEY_CLASSES_ROOT\CLSID\{Random Digits1}
  • In HKEY_CLASSES_ROOT\Interface
    • {Random Digits2}
  • In HKEY_CLASSES_ROOT\TypeLib
    • {Random Digits3}
  • In HKEY_LOCAL_MACHINE\SOFTWARE
    • Baidu
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • nnnnnnn
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AppID
    • {7A33CE9E-4F33-4B4E-B263-6AEEAB6C3DC2}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID
    • {Random Digits4}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Interface
    • {Random Digits5}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer
    • Low Rights
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
    • Browser Helper Objects
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
    • BaiduBarX

Step 4

Search and delete these files

[ Learn More ]
There may be some files 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.
  • %Desktop%\{Random}.lnk
  • %User Temp%\silentOverwrite
  • %User Temp%\Baidu-Toolbar.exe
  • %User Temp%\ljm.exe
  • %User Temp%\cf.exe
  • %User Temp%\SeFastInstall.exe
  • %User Temp%\tb.exe
  • %User Temp%\nsf{random digit}.tmp

Step 5

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