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X2KM_ROZENA.EA

February 08, 2017
 Analysis by: Michael Jay Villanueva
 ALIASES:

TrojanDropper:O97M/Farheyt.C (Microsoft); HEUR:Trojan-Downloader.Script.Generic (Kaspersky); Trojan.Mdropper (Symantec)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Spammed via email


This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

  TECHNICAL DETAILS

File Size:

50,664 bytes

File Type:

XLS

Memory Resident:

No

Initial Samples Received Date:

19 Apr 2016

Payload:

Drops files

Arrival Details

This Trojan arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

Installation

This Trojan drops and executes the following files:

  • %User Profile%\tmb.bat
    • The said .BAT file contains the following strings which is capable of adding registry for the Autostart Technique of another malware:
      • REG ADD "HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run" /V "My App" /t REG_SZ /F /D "%User Profile%\NTUSER.dat{random(8 characters)-random(4 characters)-random(4 characters)-random(4 characters)-random(12 characters)}.exe" del tmp.bat

(Note: %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.)

Dropping Routine

This Trojan drops the following files:

  • %User Profile%\NTUSER.dat{random(8 characters)-random(4 characters)-random(4 characters)-random(4 characters)-random(12 characters)}.exe --> detected as TROJ_ROZENA.EA

(Note: %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.)

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

12.476.02

FIRST VSAPI PATTERN DATE:

19 Apr 2016

VSAPI OPR PATTERN File:

12.477.00

VSAPI OPR PATTERN Date:

20 Apr 2016

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

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete these files

[ 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.  
  • %User Profile%\NTUSER.dat{random(8 characters)-random(4 characters)-random(4 characters)-random(4 characters)-random(12 characters)}.exe
  • %User Profile%\tmb.bat

Step 4

Remove the malware/grayware file that dropped/downloaded X2KM_ROZENA.EA. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • TROJ_ROZENA.EA

Step 5

Scan your computer with your Trend Micro product to delete files detected as X2KM_ROZENA.EA. 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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