Analysis by: adel
 PLATFORM:

Windows 98, ME, NT, 2000, XP, Server 2003

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Trend Micro has flagged this Trojan as noteworthy due to the increased potential for damage, propagation, or both, that it possesses. Specifically, this Trojan covers/block the user's desktop view. In order for the Trojan to be removed/unblocked, it asks for a paid SMS.

To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.

This Trojan may be downloaded by other malware/grayware/spyware from remote sites. It may be manually installed by a user.

It waits for an Internet connection to be active.

  TECHNICAL DETAILS

File Size: 167,936 bytes
File Type: PE
Memory Resident: Yes
Initial Samples Received Date: 15 Jan 2010
Payload: Drops files, Displays graphics/image

Arrival Details

This Trojan may be downloaded by other malware/grayware/spyware from remote sites.

It may be manually installed by a user.

Installation

This Trojan drops the following files:

  • %Windows%\Tasks\WindowsCheck.job - executes the dropped DLL file every system logon

(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)

Dropping Routine

This Trojan drops the following files:

  • %User Temp%\{random characters}.dll - detected as TROJ_RANSOM.SMC
  • %User Temp%\{random characters}.exe - detected as TROJ_RANSOM.SM

(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.)

Other Details

This Trojan waits for an Internet connection to be active.

  SOLUTION

Minimum Scan Engine: 8.900
FIRST VSAPI PATTERN FILE: 6.810.05
FIRST VSAPI PATTERN DATE: 29 Jan 2010
VSAPI OPR PATTERN File: 6.811.00
VSAPI OPR PATTERN Date: 29 Jan 2010

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

Remove malware files dropped/downloaded by TROJ_RANSOM.IL

Step 3

Restart in Safe Mode

[ Learn More ]

Step 4

Search and delete these files

[ Learn More ]
There may be some component 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.
  • %Windows%\Tasks\WindowsCheck.job

Step 5

Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.IL. 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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