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TROJ_ARCHSMS.B

November 30, 2012
 Analysis by: Michael Cabel
 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware

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 creates folders where it drops its files.

  TECHNICAL DETAILS

File Size:

1,665,506 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

27 Nov 2012

Payload:

Drops files, Displays graphics/image

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.

It creates the following folders:

  • %User Temp%\roXCJ

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.)

NOTES:

It disguises as Windows 8 Activator. It displays the following screenshots to trick users into thinking that the file being run is a legitimate installer of the said application:

Once it reaches the last screen, it asks the user to enter a password. It displays the following message in every attempt:

It terminates after 3 attempts.

It connects to the following websites upon execution to generate clicks for the said sites:

  • http://{BLOCKED}rchant.net/api/open.php?aid=2102499&v
  • http://{BLOCKED}rchant.net/50qjpr21e2bd/2102499/

  SOLUTION

Minimum Scan Engine:

9.300

FIRST VSAPI PATTERN FILE:

9.560.03

FIRST VSAPI PATTERN DATE:

29 Nov 2012

VSAPI OPR PATTERN File:

9.561.00

VSAPI OPR PATTERN Date:

30 Nov 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

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.
  • %User Temp%\roXCJ

Step 3

Scan your computer with your Trend Micro product to delete files detected as TROJ_ARCHSMS.B. 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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