W2KM_FAREIT.BK

 Analysis by: RonJay Kristoffer Caragay

 ALIASES:

TrojanDropper:O97M/Artitex.A (Microsoft); Troj/DocDl-ACO (Sophos); W97M/Dropper!305D5710ACB3 (McAfee); Trojan-PSW.Win32.Fareit.gsg (Kaspersky); VBA/TrojanDropper.Agent.DA (ESET-NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Spammed via email


This Trojan arrives as attachment to mass-mailed email messages.

It does not have any propagation routine.

It does not have any backdoor routine.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

It does not have any information-stealing capability.

  TECHNICAL DETAILS

File Size:

222,208 bytes

File Type:

DOC

Memory Resident:

No

Initial Samples Received Date:

02 Oct 2015

Payload:

Drops files

Arrival Details

This Trojan arrives as attachment to mass-mailed email messages.

Installation

This Trojan drops and executes the following files:

  • %User Temp%\199.rtf ← decoy file
  • %User Temp%\200.rtf ← decoy file

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Propagation

This Trojan does not have any propagation routine.

Backdoor Routine

This Trojan does not have any backdoor routine.

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\pa1.exe ← detected as TSPY_FAREIT.YYSNO

(Note: %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Information Theft

This Trojan does not have any information-stealing capability.

Other Details

This is the Trend Micro detection for Microsoft Word documents that are compromised through the insertion of a malicious macro.

NOTES:

It drops non-malicious .RTF file and opens it to deceive users into thinking it is a normal file while displaying the following error message:

Below is a sample of the said spam mail:

  SOLUTION

Minimum Scan Engine:

9.750

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

Remove the malware/grayware file dropped/downloaded by W2KM_FAREIT.BK. (Note: Please skip this step if the threat(s) listed below have already been removed.)

    • TSPY_FAREIT.YYSNO

Step 4

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 Temp%\199.rtf
  • %User Temp%\200.rtf

Step 5

Enable the macro virus protection in Microsoft Office Applications

[ Learn More ]

Step 6

Scan your computer with your Trend Micro product to delete files detected as W2KM_FAREIT.BK. 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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