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TROJ_BATWIPER.A
Aliases: Troj/BatDel-B (WebRoot), Troj/BatDel-B (Sophos), Trojan.Win32.Maya.a (Kaspersky), BAT/DelFiles.NBV trojan (Eset)
Malware type: Trojan
Destructive: No
Platform: Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
Encrypted: Yes
In the wild: Yes

Overview


Infection Channel: Dropped by other malware, Downloaded from the Internet

This destructive malware causes massive data loss.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

For the related story, you may read the blog post Unsophisticated Wiper Malware Makes Headlines

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: 185,928 bytes
File type: RAR, EXE
Memory resident: No
Initial samples received date: 17 Dec 2012
Payload: Deletes files, Drops files

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 file(s)/component(s):

  • %System%\juboot.exe - detected as TROJ_BATWIPER.A
  • %System%\jucheck.exe - detected as TROJ_BATWIPER.A

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

It drops the following non-malicious files:

  • %System%\Sleep.exe

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

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
jucheck.exe = "%System%\jucheck.exe"

NOTES:

This malware checks for the current date and deletes desktop files and all of the files found on drives D to I when it runs on dates found within the following range:

  • December 10-12, 2012
  • January 21-23, 2013
  • May 6-8, 2013
  • July 22-24, 2013
  • November 11-13, 2013
  • February 3-5, 2014
  • May 5-7, 2014
  • August 11-13, 2014
  • February 2-4, 2015

Solution


Minimum scan engine: 9.300
First VSAPI Pattern File: 9.600.05
First VSAPI Pattern Release Date: 17 Dec 2012
VSAPI OPR Pattern Version: 9.601.00
VSAPI OPR Pattern Release Date: 18 Dec 2012

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

Identify and terminate files detected as TROJ_BATWIPER.A

[ Learn more ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • jucheck.exe = "%System%\jucheck.exe"

Step 4

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.
DATA_GENERIC
  • In the Look In drop-down list, select My Computer then press Enter.
  • Once located, select the file then press SHIFT+DELETE to delete it.

    • • For Windows Vista and Windows 7 users:

    1. Click Start>Computer.
    2. In the Search input box, type the following:
      DATA_GENERIC
    3. Once located, select the file then press SHIFT+DELETE to delete it.
      *Note: Read the following Microsoft page if these steps do not work on Windows 7.

    Step 5

    Scan your computer with your Trend Micro product to delete files detected as TROJ_BATWIPER.A. 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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    Analysis By: Automation
    Modified By: Mark Joseph Manahan

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