TROJ_CHIFRAX.VTH

July 18, 2014
 ALIASES:

RDN/Generic.dx!dds (McAfee); Trojan.ADH (Symantec); Trojan.Win32.Generic!BT (Sunbelt)

 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:

  • 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.

It deletes itself after execution.

  TECHNICAL DETAILS

File Size:

239,902 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

14 Jul 2014

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 deletes the following files:

  • %Program Files%\ash.xls
  • %Program Files%\mshelp32.exe
  • %Program Files%\SETTIN~1.INI
  • %Program Files%\VSVARS~1.BAT

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000, Server 2003, and XP (32-bit), Vista (32-bit), and 7 (32-bit), or C:\Program Files (x86) in Windows XP (64-bit), Vista (64-bit), and 7 (64-bit).)

Dropping Routine

This Trojan drops the following files:

  • __tmp_rar_sfx_access_check_65734
  • svchost.exe
  • ash.xls
  • mshelp32.exe
  • setting32.ini
  • vsvarsx32.bat
  • {malware path and file name}.xls /y

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}0.1
  • {BLOCKED}6.81.94
  • {BLOCKED}.120.187
  • {BLOCKED}.49.48
  • {BLOCKED}.215.200

It deletes itself after execution.

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

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.
  • __tmp_rar_sfx_access_check_65734
  • svchost.exe
  • ash.xls
  • mshelp32.exe
  • setting32.ini
  • vsvarsx32.bat
  • {malware path and file name}.xls /y

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_CHIFRAX.VTH. 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 4

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.

  • %Program Files%\ash.xls
  • %Program Files%\mshelp32.exe
  • %Program Files%\SETTIN~1.INI
  • %Program Files%\VSVARS~1.BAT


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