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BAT_PASSTEAL.TY

June 04, 2014
 ALIASES:

BAT/PSW.Agent.BD trojan (NOD32),

 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This Trojan may be dropped by other malware.

It bypasses the Windows firewall. This allows the malware to perform its intended routine without being detected by an installed firewall.

  TECHNICAL DETAILS

File Size:

1,592 bytes

File Type:

BAT

Initial Samples Received Date:

04 Jun 2014

Payload:

Modifies files

Arrival Details

This Trojan may be dropped by the following malware:

  • TSPY_PASSTEAL.TY

Installation

This Trojan creates the following folders:

  • %All Users Profile%\Msn
  • %All Users Profile%\Msn\Msn2

(Note: %All Users Profile% is the All Users or Common profile folder, which is C:\Documents and Settings\All Users in Windows 2000, XP, and Server 2003, and C:\ProgramData in Windows Vista and 7.)

Other System Modifications

This Trojan modifies the following registry entries to disable the Windows Firewall settings:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\
Services\SharedAccess\Parametes\
FirewallPolicy\StandardProfile
Enable Firewall = "0"

(Note: The default value data of the said registry entry is "1".)

Drop Points

This Trojan uploads files to the following File Transfer Protocol (FTP) sites:

  • {BLOCKED}f.{BLOCKED}3.com
  • {BLOCKED}.{BLOCKED}h.com

NOTES:

This trojan renames files with extension .abc to .exe in current path folder.

It delete files with the following file extensions:

  • *.001
  • *.002
  • *.003
  • *.004
  • *.005
  • *.006
  • *.007
  • *.007
  • *.008
  • *.009
  • *.010
  • *.011
  • *.012
  • *.013
  • *.014
  • *.015
  • *.016
  • *.017
  • *.018
  • *.019
  • *.020
  • *.021
  • *.022
  • *.023
  • *.024
  • *.025
  • *.026
  • *.027
  • *.028
  • *.029
  • *.030
  • *.031
  • *.032
  • *.033
  • *.jpe
  • *.jpg
  • *.jpeg

It executes other components of TSPY_PASSTEAL.TY.

It executes the following files with its command line parameters:

  • images.exe wmsn.klb
  • image.exe -f msn.klc
  • picture viewer.exe -f wmsn.klc
  • mdej.exe
  • cogj.reg

It modifies the file attributes of files under the following folder to read only, archive, system and hidden.

  • %All Users Profile%\Msn
  • %All Users Profile%\Msn\Msn2
  • %System Root%\users\public\Public Document

It renames the following files:

  • msn.kla to PIC_{date-yyyyddmm}_{time}.16
  • wmsn.klb to PIC_{date-yyyyddmm}_{time}.17
  • msn.klc to 001_{date-yyyyddmm}_{time}.33
  • wmsn.klb to 001_{date-yyyyddmm}_{time}.34
  • msn.klc to 001_{date-yyyyddmm}_{time}.35

  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

Remove the malware/grayware file dropped/downloaded by BAT_PASSTEAL.TY. (Note: Please skip this step if the threat(s) listed below have already been removed.)

     
    • TSPY_PASSTEAL.TY

Step 3

Restore this modified 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\SYSTEM\CurrentControlSet\Services\SharedAccess\Parametes\FirewallPolicy\StandardProfile
    • From: Enable Firewall = "0"
      To: Enable Firewall = "1"

Step 4

Search and delete these folders

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %All Users Profile%\Msn

Step 5

Scan your computer with your Trend Micro product to delete files detected as BAT_PASSTEAL.TY. 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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