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TROJ_BANLOAD.GRL

November 27, 2012
 ALIASES:

Trojan.Win32.BHO.chzm (Kaspersky); LooksLike.Win32.Malware!vb (v) (Sunbelt)

 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:

37,376 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

27 Nov 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.

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\Software\Description\
Microsoft\Rpc\UuidTemporaryData

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

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Description\
Microsoft\Rpc\UuidTemporaryData
NetworkAddress = "{random values}"

HKEY_LOCAL_MACHINE\SOFTWARE\Description\
Microsoft\Rpc\UuidTemporaryData
NetworkAddressLocal = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
system
EnableLUA = "0"

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer\
Browser Helper Objects
NoExplorer = "1"

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\muJwCEcWHVtC840FYQ1dKphY8I9dhmJz871h1K
  • %User Profile%\LOCALS~1\Tempó ñ4Ù8î÷J3×ßQã@Öá_CHAR(0x1F)_â_CHAR(0x1E)_åñýÊïa_CHAR(0x1E)_Ø
  • %System%\HbIEMan.dll

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

This report is generated via an automated analysis system.

  SOLUTION

Minimum Scan Engine:

9.300

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_LOCAL_MACHINE\Software\Description\Microsoft\Rpc
    • UuidTemporaryData
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Ext
    • CLSID

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\Description\Microsoft\Rpc\UuidTemporaryData
    • NetworkAddress = "{random values}"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Description\Microsoft\Rpc\UuidTemporaryData
    • NetworkAddressLocal = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\system
    • EnableLUA = "0"
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects
    • NoExplorer = "1"

Step 4

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%\muJwCEcWHVtC840FYQ1dKphY8I9dhmJz871h1K
  • %User Profile%\LOCALS~1\Tempó ñ4Ù8î÷J3×ßQã@Öá_CHAR(0x1F)_â_CHAR(0x1E)_åñýÊïa_CHAR(0x1E)_Ø
  • %System%\HbIEMan.dll

Step 5

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