arrow_back
search
close

TROJ_BOAXXE.SMI

October 19, 2013
 ALIASES:

TrojanDropper:Win32/Boaxxe.D (Microsoft); generic!bg.ggp (McAfee); Trojan.Adclicker (Symantec); Trojan-Downloader.Win32.Delf.fjs (Kaspersky); Trojan.Spy.BZub.NHN (FSecure)

 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:

126,976 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Nov 2011

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.

Autostart Technique

This Trojan registers itself as a BHO to ensure its automatic execution every time Internet Explorer is used by adding the following registry keys:

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects\{AFAEF13D-AFA1-4FAF-A89A-351A0545C6BC}

Other System Modifications

This Trojan deletes the following files:

  • %System%\cdfvie.dll
  • %System%\ipv6mops.dl_
  • %System%\ipv6monq.dl_
  • %System%\ipv6mopz.dl_
  • %System%\ipv6mons.dl_
  • %System%\ipv6mote.dl_
  • %System%\ipv6mopk.dl_
  • %System%\ipv6motp.dl_
  • %System%\AClient.dl_

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

It adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{AFAEF13D-AFA1-4FAF-A89A-351A0545C6BC}\
InprocServer32

HKEY_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Settings

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{AFAEF13D-AFA1-4FAF-A89A-351A0545C6BC}\InprocServer32
ThreadingModel = "apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Settings
bf = {random values}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Settings
bk = {random values}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Settings
iu = 72f

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Settings
mu = {random values}

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\dat1.tmp

(Note: %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.)

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.200

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

Close all opened browser windows

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\CLSID\{AFAEF13D-AFA1-4FAF-A89A-351A0545C6BC}
    • InprocServer32
  • In HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer
    • Browser Settings

Step 4

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\{AFAEF13D-AFA1-4FAF-A89A-351A0545C6BC}\InprocServer32
    • ThreadingModel="apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Settings
    • bf={random values}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Settings
    • bk={random values}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Settings
    • iu=72f
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Settings
    • mu={random values}

Step 5

Search and delete this file

[ 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. %User Temp%\dat1.tmp

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_BOAXXE.SMI. 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 7

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%\cdfvie.dll
  • %System%\ipv6mops.dl_
  • %System%\ipv6monq.dl_
  • %System%\ipv6mopz.dl_
  • %System%\ipv6mons.dl_
  • %System%\ipv6mote.dl_
  • %System%\ipv6mopk.dl_
  • %System%\ipv6motp.dl_
  • %System%\AClient.dl_


Did this description help? Tell us how we did.