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Threat Encyclopedia

BKDR_XTRAT.JT

ANALYSIS BY

Nikko Tamana


ALIASES:

W32/VBKrypt.NQYR!tr (Fortinet), Virus.Win32.CryptExe (Ikarus), probably a variant of Win32/Agent.KPYNHWZ trojan (NOD32)

PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type:Backdoor

  • Destructiveness:No

  • Encrypted: Yes

  • In the wild: Yes

OVERVIEW

TECHNICAL DETAILS

SOLUTION

Minimum Scan Engine:

9.200

FIRST VSAPI PATTERN FILE:

9.524.02

FIRST VSAPI PATTERN DATE:

13 Nov 2012

VSAPI OPR PATTERN File:

9.525.00

VSAPI OPR PATTERN Date:

14 Nov 2012

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

Terminate a malware/grayware process

[ Learn More ]

*Note: If the detected process is not displayed in theWindows Task Manager, continue doing the next steps.

    • ie4uinit.exe

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_CURRENT_USER\Software\--((Mutex))--
    • ServerStarted
  • In HKEY_CURRENT_USER\Software\XtremeRAT
    • Mutex
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • ie4uinit.exe

Step 4

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. Before you could do this, you must restart in Safe Mode. For instructions on how to do this, you may refer to this page If the preceding step requires you to restart in safe mode, you may proceed to edit the system registry.

  • In HKEY_CLASSES_ROOT
    • rr1081767346z.ypa
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes
    • rr1081767346z.ypa

Step 5

Search and delete this file

[ Learn More ]
There may be some component 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.
  • %Application Data%\Microsoft\Crypto\RSA\S-1-5-21-1614895754-436374069-682003330-1003\c0528c2346cb928a9052304ef3ab8fd4_411f3a52-26ed-4872-9a07-8c966acba234
  • %Application Data%\Microsoft\Windows\--((Mutex))--.dat

Step 6

Scan your computer with your Trend Micro product to delete files detected as BKDR_XTRAT.JT. 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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