TROJ_BANLOAD.EKCQ


 ALIASES:

RDN/PWS-Banker.dldr!i (McAfee); Trojan.Asprox.B (Symantec); Trojan-Dropper.Win32.Injector.lafh (Kaspersky); Mal/EncPk-ABH (Sophos); Trojan.Win32.Generic!BT (Sunbelt); Trojan horse Downloader.Banload2.UYO (AVG)

 PLATFORM:

Windows

 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:

262,144 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

10 Jan 2015

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\{C2A3800A-383D-47CF-A1AF-8C1B1FA942EE}

Other System Modifications

This Trojan deletes the following files:

  • %User Profile%\Identities\~3.tmp
  • %User Profile%\Microsoft\~5.tmp

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

It adds the following registry keys:

HKEY_CLASSES_ROOT\CLSID\{C2A3800A-383D-47CF-A1AF-8C1B1FA942EE}

HKEY_CLASSES_ROOT\CLSID\{C2A3800A-383D-47CF-A1AF-8C1B1FA942EE}\
InprocServer32

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Ext\
Settings\{C2A3800A-383D-47CF-A1AF-8C1B1FA942EE}

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Ext\CLSID

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
CLSID\{C2A3800A-383D-47CF-A1AF-8C1B1FA942EE}\InprocServer32
ThreadingModel = "Apartment"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Ext\CLSID
{C2A3800A-383D-47CF-A1AF-8C1B1FA942EE} = "1"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\~C
  • %User Temp%\~1
  • %User Profile%\Identities\wlmirnttl.off

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}3.7.217/ches/index.html
  • http://{BLOCKED}3.7.217/ches/wucpsw1.js
  • {BLOCKED}0.1
  • {BLOCKED}.42.147
  • {BLOCKED}8.42.36
  • {BLOCKED}.197.203
  • {BLOCKED}3.241.154
  • {BLOCKED}.151.16
  • {BLOCKED}.178.97
  • {BLOCKED}121.246
  • {BLOCKED}6.81.24
  • {BLOCKED}108.11
  • {BLOCKED}.180.195

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.700

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
    • {C2A3800A-383D-47CF-A1AF-8C1B1FA942EE}
  • In HKEY_CLASSES_ROOT\CLSID\{C2A3800A-383D-47CF-A1AF-8C1B1FA942EE}
    • InprocServer32
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Ext\Settings
    • {C2A3800A-383D-47CF-A1AF-8C1B1FA942EE}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Ext
    • CLSID

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\{C2A3800A-383D-47CF-A1AF-8C1B1FA942EE}\InprocServer32
    • ThreadingModel = "Apartment"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Ext\CLSID
    • {C2A3800A-383D-47CF-A1AF-8C1B1FA942EE} = "1"

Step 5

Search and delete these components

[ Learn More ]
There may be some components 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%\~C
  • %User Temp%\~1
  • %User Profile%\Identities\wlmirnttl.off

Step 6

Scan your computer with your Trend Micro product to delete files detected as TROJ_BANLOAD.EKCQ. 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.

  • %User Profile%\Identities\~3.tmp
  • %User Profile%\Microsoft\~5.tmp


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